Multiferroics: Explanation of Types and Plants

Multiferroics: Explanation of Types and Plants Chapter 2 Multiferroics 2.1 Introduction to Multiferroics: H. Schmid used the term multiferroic for the first time in 1994. Those materials which combine multiple ferroic properties such as ferromagnetism, ferroelectricity and ferroelasticity are known as multiferroics. Simultaneous coexistence of at least two ferroic properties takes place in the same phase in multiferroics. It has the feasibility of exhibiting coupling between ferroelectricity and magnetism which is known as the magnetoelectric effect (ME). This ME enables the external electric field to change magnetization [1]. Each multiferroic property is closely connected to symmetry. The principal ferroic properties can be characterized by their behavior under time and space inversion. For example the direction of polarization P is reversed by Space inversion while leaving the magnetization M invariant. In turn, time reversal will change the sign of M, while the sign of P remains invariant. A simultaneous violation of space and time inversion symmetry is required by Magnetoelectric multiferroics [2]. There are also various potential applications of multiferroic such as information storage, spintronics, sensors and microelectronics devices in the field of material science due to the presence of strong coupling of electric, magnetic and structural order parameters. These parameters gave rise to simultaneous occurrence of ferroelectricity, ferroelasticity and ferromagnetism [3]. Application of magnetic field can induce intrinsic polarization and application of external electric field can induce magnetization in any magnetoelectric compound. Apart of industrial application, these coupling of properties in magnetoelectric compounds makes them important from physics point of view because of their enriched physical properties. However very few materials shows both these ferroic properties at or above room temperature [4]. Two fundamental forces of nature are magnetism and electricity. Combination of these two properties in a single multiferroic material is applicable for many practical applications such as they can be used as magnetic sensors in which the sign of their electric polarization changes with a small magnetic field. These effects are important to understand as multiferroics are not only quite rare but their properties also helps to develop materials where these effects are suitably strong for applications. A beam of x-rays are used to study the magnetic properties of multiferroics. The electronic states of the iron ions in the crystal are specifically probed by the x-rays which are related to its magnetic properties. This experiment reveals that these electronic states extend throughout the material in a periodic manner. It breaks the crystal symmetry and leads to a shift of the electrically charged atoms in the crystal which is responsible for multiferroic properties. Each iron atoms is surrounded by a symmetric arrangement of oxygen atoms and the magnetic moments of the iron atoms are in disorder at room temperature whereas the magnetic moments are assumed to have the shape of a screw at low temperatures. The energy of the chemical bonds are slightly altered by each magnetic moment in the crystal which depends on the relative orientation between the chemical bond direction and the magnetic moment. The resulting force distorts the crystal structure which leads to an electric polarization [5]. Recently, multiferroics due to their potential properties such as comprising of ferroelectric and ferromagnetic ordering in elastically distorted systems have drawn a major attention of researchers for fabrication of magnetic and ferroelectric devices. High dielectric constant, low dielectric loss, high temperature phase transition and small structural distortion occurs mainly due to the electric, magnetic and stress field applied on the materials for multifunctional applications. In the process of development of new materials, many novel materials have been detected for different purposes due to their useful and interesting properties [6]. 2.2 Types of Multiferroics: Multiferroics can be divided into two groups: Type-I Multiferroics2) Type-II Multiferroics Type-I Multiferroics: This type of multiferroics are older, more numerous and are good ferroelectrics. Above room temperature, the critical temperatures of the magnetic and ferroelectric transitions can be well. In these materials, the coupling between magnetism and ferroelectricity is unfortunately weak [14]. Different origin of ferroelectricity and magnetism in type-I multiferroic are mostly due to different active subsystems of a material. There is a certain coupling between breaking time reversal symmetry, breaking spatial inversion symmetry, ferroelectric order parameter, magnetic order parameter in such type-I multiferroics. In these materials, ferroelectricity can have a number of possible microscopic origins [7]. For example: BiFeO3 with the ferroelectric transition temperature Tc higher then the Neel transition temperature TN. [8] Type-II Multiferroics: Due to the recent discovery of a novel class of multiferroics, there is the biggest excitement as ferroelectricity exists only in a magnetically ordered state and is caused by a particular type of magnetism. A nonzero electric polarization occurs in the low temperature phase [14] . For example CuFeO2 with Tc = TN [15]. The magnetic and/or electric polarization of the barrier controls the current driven through a magnetic tunnel junction (MTJ) with a multiferroic tunnel barrier. Multiferroic tunnel junctions is referred to the junctions with a multiferroic tunnel barrier. The use of a multiferroic material as a tunnel barrier and ferromagnetic materials as leads in MFTJs would lead to 8 possible resistive states of such junctions [9]. Figure 1.3: Multiferroic tunneljunction (left) and eight resistive states that it provides (right). The ferroelectric polarization is depicted with the black arrow; the white arrow stands for the magnetization. Cupric Ferrite (CFO): type-II multiferroic has attracted increasing attention due to the recent discovery of ferroelectricity in the first magnetic field induced phase. It is considered as a distinct class of magnetoelectric (ME) multiferroics [10]. Magnetic field induced generates a spontaneous electric polarization parallel to the helical axis in delafossite compound CuFeO2 [11]. Delafossite crystals have general formula ABO2, where A represents cations which are linearly co-ordinated with two oxygen ions and B represents cations, situated in distorted edge-sharing BO6 octahedra [12]. The materials possesse R m space group and have found very useful device applications because of different properties such as superconductivity, large magnetoresistance, thermoelectric effects and multiferroicity [13]. It has Hexagonal crystal structure. Figure 1.Crystal structure of CuFeO2 with the hexagonal unit cell [14] These effects make them potential candidates for device applications in such kind of multiferroic materials. CFO was first discovered by Friedel and Hebd12 in 1873 and it is considered to be one of the promising materials of this group [15]. CFO was broadly studied in past decade due to its pleasing antiferromagnetic properties at liquid helium temperatures. Numerous magnetic phase transitions and multiferroicity due to geometrical frustrations at low temperature are seen by this antiferromagnet on a triangular lattice [16, 17, 18, 19]. The delafossite structure of CFO consists of hexagonal layers of Cu, O and Fe accumulated with a Cu-O-Fe sequence along the c-axis in order to form a layered triangular lattice antiferromagnet. It is a p-type semiconductor with low conductivity ÏÆ'=1.53 53 S/cm, high Seebeck coefficient S=544 V/K, and a small bandgap of 1.15 eV. The electrical and optoelectrical properties of CFO were explored by by Benko and Koffyberg [20, 21]. By combining two of the fundamental forces of nature i.e magnetism and electricity in a single multiferroic material in which one controls the other is not only of basic interest, but also significant for practical applications. Multiferroic materials can also be used as magnetic sensors in which the sign of their electric polarization is changed with a small magnetic field. A new mechanism has been verified after studying the properties of the multiferroic CuFeO2 by which magnetism and electricity can be coupled in a single material. Magnetism and ferroelectricity are coupled in different ways in multiferroics. Apart of multiferroics being quite rare, a better understanding of their properties is essential as it helps to develop materials where these effects are suitably strong for applications. the magnetic properties of CuFeO2 using a beam of x-rays were studied by the researchers. This study reveals that these electronic states extend throughout the material in a periodic manner which is directly responsible for the multiferroic properties as it breaks the crystal symmetry and leads to a shift of the electrically charged atoms in the crystal. Each of the iron atoms is surrounded by a symmetric arrangement of oxygen atoms and the magnetic moments of the iron atoms are in disorder at room temperature. The energy of the chemical bonds is slightly altered by each magnetic moment in the crystal which depends on the relative orientation between the magnetic moment and the chemical bond direction. The crystal structure is then distorted by the resulting force which leads to an electric polarization [22]. Several routes for the synthesis of multiferroics are being applied such as solid state synthesis hydrothermal synthesis, sol-gel processing, Sol-Gel autocombustion, vacuum based deposition, floating zone [23]. In the present study, modified Sol-Gel autocombustion technique is used. Processing techniques influence the physical properties and the ideal synthesis techniques provide superior control over the parameters such as crystallite size, distribution of particle sizes and interparticle spacing which have the greatest impact on the magnetic and other properties [24, 25]. In present work we have adopted sol-gel auto-combustion technique because of some advantages over other methods like the reagents are simple compounds, special equipments are not required, agglomeration of powders remains limited and dopant can be easily introduced into the final product. The properties of the final product such as particle size, surface area and porosity depend on the method of combustion [26, 27] 2.3 Plants: According to the literature reviews, various microorganisms such as fungi, yeasts algae and bacteria are used for the biosynthesis of nanoparticles but presently a new trend has come to force the use of plants for the fabrication of nanoparticles because of its spontaneous, economical, eco-friendly protocol, suitable for large scale production and single step technique for the biosynthesis process [28]. The major mechanism examined for the synthesis of nanoparticles mediated by the plants is due to the presence of phytochemicals which are responsible for the spontaneous reduction of ions are flavonoids, terpenoids, carboxylic acids, quinones, aldehydes, ketones and amides [29]. The botanical details about the currently used flowers for the study of synthesis of Cupric Ferrite are as follows: Delonix Regia [30] Rosa indica: [31] Vinca [32] Hibiscus [33] Jasmine [34] Euphobia milli [35] Alamanda [36] References [1] I. E. Dzyaloshinskii, Sov. Phys. JETP 10, 628 (1960). [2] Hill, J.Phys. Chem. B 104, 6694 (2000). [3] M. E. McHENRY and D. E. LAUGHLIN, Acta mater. 48, 223, (2000). [4] Samar Layek* and H. C. Verma,Adv. Mat. Lett. 3(6), 533 (2012). [5] Tanaka, Y., et al. Incommensurate orbital modulation behind ferroelectricity in CuFeO2, PHYS REV LETT. 109, 127205, (2012). [6] Jyoshna Rout, R. Padhee, Piyush R. Das and R.N.P. Choudhary, Adv. Appl. Phy. 1 105, (2013). [7] Daniel Khomskii, Classifying multiferroics: Mechanisms and effects, Am. J. Phys. 2, 20 (2009). [8] Randy Fishman, Oak Ridge National Laboratory, Materials Science and Technology Division, Monday, 22 September, 2014 [9] http://inside.hlrs.de/htm/Edition_01_11/article_11.html [10] T. Nakajima, S. Mitsuda, K. Takahashi, M. Yamano, K. Masuda, and H. Yamazaki, Am. J. Phys. 79, 214423 (2009). [11] S. Mitsuda, M. Yamano, K. Kuribara, T. Nakajima, K. Masuda, K. Yoshitomi, N. Terada, H. Kitazawa, K. Takenakaand, T. Takamasu, Am. J. Phys. 200, 1 (2010). [12]S. P. Pavunny, Ashok Kumar and R. S. Katiyar, J. Appl. Phys. 107, 1 (2010). [13] F. A. Benko and F. P. Koffyberg, J. Phys. Chem. Solids. 45, 57 (1984). [14] S. Mitsuda, M. Yamano, K. Kuribara, T. Nakajima, K. Masuda, K. Yoshitomi, N. Terada, H. Kitazawa, K. Takenakaand, T. Takamasu, Am. J. Phys. 200, 1 (2010). [15] Shojan P. Pavunny, Ashok Kumar, and R. S. Katiyar, J. Appl. Phys. 107, 013522 (2010) [16] T. Kimura, C. Lashley, and A. P. Ramirez, Phys. Rev. B 73, 220401  (2006). [17] S. Seki, Y. Yamasaki, Y. Shiomi, S. Iguchi, Y. Onose, and Y. Tokura, Phys. Rev. B 75, 100403 (2007). [18] S. Omeiri, Y. Gabes, A. Bouguelia, and M. Trari, J. Electroanal. Chem.  614, 31 (2008). [19] H. Takahashi, Y. Motegi, R. Tsuchigane, and M. Hasegawa, J. Magn.  Magn. Mater. 216, 272, (2004). [20] F. A. Benko and F. P. Koffyberg, J. Phys. Chem. Solids 45, 57 (1984). [21] F. A. Benko and F. P. Koffyberg, J. Phys. Chem. Solids 48, 431 (1987). [22] Tanaka, Y., et al., Phys. Rev. Lett. 109, 127205 (2012). [23] D. Varshney et al., J. Alloys Compd. 509, 8421 (2011) [24] Candac T S, Carpenter E E, O’Connor C J, John V T and Li S, IEEE Trans. Magn. 34, 1111 (1998). [25]Pillai V, Kumar P, Hou M J, Ayyub P and Shah D O,Adv. Coll. Int. Sc. 55, 241 (1995). [26] Aruna S T and Patil K C, Nano Structr. Mater. 10, 955 (1998). [27]M.Y. Salunkhe, D.S. Choudhry, D.K. Kulkarni, Vibr. Spectrosc. 34, 221  (2004) [28] Huang J, Li Q, Sun D, Lu Y, Su Y, Yang X, Wang H, Wang Y, Shao W, He N, Hong J, Chen C, Nanotechnology 18: 105104 (2007). [29] Sukumaran Prabhu* and Eldho K Poulose, Int Nano Lett. 2:32, 1 (2012). [30] http://plants.usda.gov/core/profile?symbol=DERE [31] http://plants.usda.gov/core/profile?symbol=ROIN5 [32] http://plants.usda.gov/core/profile?symbol=VINCA [33] http://plants.usda.gov/core/profile?symbol=HIRO3 [34]https://plants.usda.gov/java/ClassificationServlet?source=displayclassid=JASMI [35]https://plants.usda.gov/java/ClassificationServlet?source=displayclassid=EUPHO [36] http://plants.usda.gov/core/profile?symbol=ALCA7

America in World War Two Essay -- WWII World War 2 Essays

Leading into the American involvement in World War II, American ideas were harsh. The United States turned to isolationism instead of involvement. Most Americans opposed taking a role in the war. Many even opposed any aid to help those countries who were in war. The diplomacy of isolationism quickly changed after the Japanese attack on Pearl Harbor in 1941. America suddenly was thrown into the warfront. During World War II many ways and ideas of the American culture changed once again. Now, most Americans supported the war. Technology was advanced immensely, thus creating weapons of mass destruction. Even stifle American women were now getting jobs that were once held only by men. The events leading up to and the actual American involvement in the war has changed America into what it is today. Roosevelt was elected for a third term in 1940. At his State of the Union address, he made it clear that Americans needed to shift away from isolationism. He stressed that America should help those who were in struggle to keep their rights. He expanded on several ideas, such as, equality, jobs and security. He also touched on such subjects like the social economy. Roosevelt also made sure to hit hard on the fact that it is in Americans freedoms to be from fear. With this idea, he tried to have people come to the realization that Great Britain needed out help, and that as Americans, we would only be contributing to those human rights by helping them keep their freedom. With Great Britain fighting the war alone, Americans slowly changed their minds to supporting them. Those who still opposed any intervention in the war fo... ...bing. She also talks about how there were many like her that were burned by the bomb. The entire city was burning, not only those who were hit directly by the bomb. America in the Second World War was very different. The direct isolationism that the American government first played was quickly switched to war intervention with the bombing of Pearl Harbor. Gender and social roles were also affected by this war. Women and blacks were now able to work in jobs that were once reserved only for white men. The harsh environment that we forced upon our own citizens was nothing of the environments that those Japanese Americans had to live through. America in World War II was a very different kind of place. Our ideas and ways changed with a simple bombing. War is very delicate and it proved to be that way to the United States.

Printing Press

†¢Intro things to discuss The ancient Greeks wrote texts intended for education only the privileged, wealthy few who could afford scribes. The modern textbook has its roots in the standardization made possible by the printing press. Early textbooks were used by tutors and teachers, who used the books as instructional aids The next revolution for books came with the 15th-century invention of printing with changeable type. The invention is attributed to German metal smith Johannes Gutenberg, who cast type in molds using a melted metal alloy and constructed a wooden-screw printing press to transfer the image onto paper.Gutenberg's invention made mass production of texts possible for the first time. †¢In general the invention of the printing press (Lower-class) Before Gutenberg's printing press, reading books were a privilege for the church and some of the nobility, literacy was practically non-existent in the lower class, books were extremely expensive, and scientists never sh ared their work with other scientist. After the printing press was invented, books became considerably cheaper to afford, thus, making it easier for lower class citizens, as well as, libraries to afford books and circulate them throughout Europe.With the increase in books and the availability of them, came the increase in literacy among the lower classes. †¢traditional lecture before the invention- who accessed books †¢how it impacted education Also, since it was easier to print work scientist started sharing their works with each other. This was an amazing improvement in science, because now scientist could critic each other's work, improve upon it, and eventually come up with correct conclusions. †¢how the printing press (changed the role of the Catholic Church) No more did people have to accept what the church told them – they could now read it for themselves.In an indirect way, it led to the Reformation of the church, one of the major events in European his tory. Without the printing press and the availability of Bibles, Martin Luther may not have been in the position to question the authority of the church and to encourage people to study the Bible for themselves to see how Faith was the means to salvation, rather than â€Å"good works†, as the Catholic Church had expounded for centuries. The church officials, before the printing press was invented, were the only ones to read the Bible and they, then taught their interpretations to the congregation. When the printing presses started printing

Italian Verb Conjugations Tenere

The Disclosure Of Private Search Dat Aol Inc. ( An...

Many researchers are facing the challenges of producing and publishing data with the help of technologies without breaching of the privacy and confidentiality. In this report, a case study of the disclosure of private search data in AOL Inc. (an American web search media) is presented to reveal the consequences of privacy violation and highlight the importance of ethical awareness and privacy protection in research projects. Modern researchers are using technologies to collect, analyse, publish and store data electronically to improve productivity. While the deployment of the software, hardware and networks has proven to be efficient and effective, many ethical dilemmas may have encountered along with the data handling process. Lynch (2000) suggests that information is a powerful source and user accessibility is the key to its prosperity. Given the open access, duplication convenience and fast dissemination features of the online data, it is important to make ethical and legal judgments in what and how information should be collected and utilised in order to protect people’s rights and privacy. Since legal control normally fall behind technical improvements, ethics steps forward to bridge the gap and guide people in making moral decisions when handling sensitive information. Ethics refer to the rules and guidelines for differentiating between right and wrong behavior. Individuals may reach common understandings on some ethical norms but interpret them differentlyShow MoreRelatedMonsanto: Better Living Through Genetic Engineering96204 Words   |  385 Pagescommercial and social objectives C A S E N I N E From greenï ¬ eld to graduates: University of the Sunshine Coast C A S E T E N Whole Foods Market, 2005: Will there be enough organic food to satisfy the C A S E E L E V E N growing demand? Wal-Mart Stores Inc.: Dominating global retailing C A S E T W E L V E 14_Hanson_3ed_SB_3869_TXT.indd 441 8/29/07 1:09:33 PM 442 INTRODUCTION A SUMMARY OF THE CASE ANALYSIS PROCESS Case analysis is an essential part of a strategic management course

Personal Statement My Leadership - 1098 Words

In terms of my leadership, I think I grew much more confident and strict as a leader. When I started, I remember thinking that all my residents would be wonderful and would listen to their RA, because I always did so everyone else would too. That was clearly not the case, especially when it came to quiet hours. Confrontations are frightening to me because I have had bad experiences in the past. But as an RA, it is part of what I need to do. Once residents started complaining about one another, I realized warnings were not sufficient. So I started documenting residents who were loud during quiet hours. I also grew as a confident leader through my trivia week. I remember feeling really nervous to knock on everyone s door to do trivia. I am†¦show more content†¦We as a society need to teach everyone what microaggressions are and how they are impacting people. And this can be done as an RA through bulletin boards or active programs. Through the discussion of microaggressions, I have developed a more sensitive ear around campus and especially in my residence hall. Now that I know the impact of phrases such as ‘that is so gay’ I no longer can simply sit there and say nothing. I feel the need to react to the speaker and call them out. As a mid year RA hire, what would have helped me in the RA class would have been a class that tailored to our needs as a mid year hire. For example, we talked about the theory of involvement and the first six weeks as if that was going on in our communities. None of my residents were new students that semester and therefore the first six weeks of college did not apply to them. And while the involvement aspect is more relevant because people can always join another club, most of my residents stuck with what they were already doing. Instead, I wish we talked more about how to assimilate with a staff that had already bonded. 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What is Applied Business Research and Its Objectives - Free Sample

Questions: The following are the research objectives of the study: 1. To assess the customer service initiatives offered by wild bean cafe. 2. To examine the potential market opportunities of Wild bean caf in order to gain more market share in domestic market. Answers: Porters five forces theory Porters five forces theory can be used here to analyze the potential market opportunities of Wild Bean caf. There are five vital forces which can determine the possibilities in the business situation of the restaurant. Supplier power It is very easy for any provider to drive up the prices of the things they supply. That is mainly driven by a fair number of suppliers of the uniqueness of the product they supply which is the proof of their strength and the control over the company (Competition, market structure and market power within the hotel-supplier sector in Antalya 2016). In the field of market opportunities, the power of the supplier plays a vital role in the case of Wild Bean caf. Buyer Power Buyers power can mainly be decided by the strength of the buyer that how they are driving the prices down. If the supplier can drive the price up then, a buyer can drive it down with his/her power. Buyer power is a very crucial aspect in the field of market opportunities for Wild Bean caf (Raff and Schmitt 2009). Competitive Rivalry Like any other business Wild Bean caf also has the rivalries in the market. Market opportunities include the threat of competition as other cafes like the Wild Bean may try the same strategies to take over other cafes in the market ("Market study says Russian coatings market boasts solid growth rate, expansion opportunities" 2004). Substitution Threat In this part of the market opportunity, the customer may find a substitute of the things which is provided by Wild Bean caf. For example, suppose Wild Bean caf is providing a combo offer of a cheese sandwich and two cold coffees at $8 where customers find it cheaper while buying it individually from the market. This case of substitution can weaken the power of the caf. New Entry The facts of new entries can be a threat to the existing business of the market. Suppose Wild Bean caf has some economic scales in place, or it has protected its key technologies for financial purposes. Then the new competitors can enter the market easily to weaken the position of Wild Bean caf. The key technologies should be used by Wild Bean caf efficiently. Without the further protection of the key technologies Wild Bean caf should be a bit open minded to use the technologies. PESTEL analysis The customer service initiative can directly or indirectly be indirectly being connected with the PESTEL analysis. If Wild Bean caf wants to provide excellent service to the customer, it has to go through the six-part of this analysis such as political, economic, social, technological, environmental and legal. Political In the political part, Wild Bean caf has to go through the rules and regulation of the government in the case of providing services to the customer. It concern about the way which can be followed by the Wild Bean Cafe. By maintaining the strategy, Wild Bean Cafe develop their food quality more and better. Economical Economical part is also a part to be watched as the caf should be aware of the fact whether they are making any profit or not (Yksel 2012). The acceptance of the society is also a matter of concern for the caf. The cafe industry is very high as well as a growing market. There are several important leaders opposite the Wild Bean Cafe. They are competing with other to take more share from the market. That is the main economic factor, and it might be a threat to all industries. Social The social trends mainly introduced to concern about the health issues. Food like, coffee can also be a part of dangerous beverage. That's why people can always go for new and fresh juices. That may be tea or something. That the social analysis which must be concerned about the Wild Bean Cafe for maintaining healthy food products. Technological The technological fact is directly connected with the economic fact. Innovation in the technologies can lead the economic factor to the highest level of success. The Wild Bean Cafe need to develop new equipment and machines to beat the competitors. There were always high as well as increasing the variety of foods. To make some complicated food, the high standard technology was required. Legal The company of Wild Bean caf must be done in a legal way. They have to satisfy the customers with all their efforts but obviously in a legal way. Environmental Factors Wild Bean Cafe need to some innovative measures regarding the environment. The cafe can develop their policies for recycling. Also, it is crucial for reducing waste and buildin g green. References Competition, market structure and market power within the hotel-supplier sector in Antalya. Market study says Russian coatings market boasts solid growth rate, expansion opportunities. (2004).Pigment Resin Technology,33(3). Raff, H. Schmitt, N. (2009).Buyer power in international markets. Munich: CESifo. Yksel, I. (2012). Developing a Multi-Criteria Decision Making Model for PESTEL Analysis.IJBM,7(24).