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Sunday, November 15, 2020 | History

2 edition of Exchange bias anisotropy found in the catalog.

Exchange bias anisotropy

Nienchtze Teng

Exchange bias anisotropy

probing the FM/AF spin interaction with variable-temperature ferromagnetic resonance

by Nienchtze Teng

  • 161 Want to read
  • 24 Currently reading

Published .
Written in English

    Subjects:
  • Anisotropy,
  • Ferromagnetic resonance,
  • Spin exchange

  • Edition Notes

    Statementby Nienchtze Teng
    The Physical Object
    Paginationviii, 67 leaves :
    Number of Pages67
    ID Numbers
    Open LibraryOL15268379M

    Ising-type antiferromagnets: model systems in statistical physics and in the magnetism of exchange bias. [Christian Binek] Ising-type Antiferromagnets: Model Systems in Statistical Physics Ferromagnetic Thin Films for Perpendicular and Planar Exchange-bias Systems -- Anisotropy -- Thin-film Growth on Antiferromagnetic. anisotropy of the ferromagnet, called exchange bias e ect (EB-e ect) and a pinned magnetic moment in the antiferromagnet. The rst lead to a horizontal shift of the ferromagnetic hys-teresis loop. The pinned AF moments often generate a vertical shift of the hysteresis loop. MAGNETIC ANISOTROPY IN EPITAXIAL CrO2 AND¼ PHYSICAL REVIEW B 74, ͑͒ by epitaxial by nm thickness Cr2O3 layer To observe the exchange bias based on the random field model using the condition that the anisotropy of the AFM must be larger than the interface coupling energy, i.e., 4zͱAAFMKAFM/ ␲2 Ͻ KAFMtAFM where AAFM and. It is well known that magnetic exchange coupling across the ferromagnet–antiferromagnet interface results in an unidirectional magnetic anisotropy of the ferromagnetic layer, called exchange bias. Despite large experimental and theoretical efforts, the origin of exchange bias is still controversial.


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Exchange bias anisotropy by Nienchtze Teng Download PDF EPUB FB2

The modeling gives magnetic parameters including the anisotropy and magnetization of Co and Ni 81 Fe 19 layers, magnitude and direction of the exchange bias, and the interlayer coupling. The interlayer coupling is found to be an order of magnitude higher in S1 as compared to S2 and S3.

Exchange bias arises due to a surface or interfacial exchange anisotropy [62].The idea of a surface exchange anisotropy was first proposed by Meiklejohn and Bean [63] and arises due to regions of antiferromagnetic coupling to generally ferri- or ferromagnetic antiferromagnetic regions are considered to have strong magnetocrystalline anisotropy and this preferred direction of.

The anisotropy of [Pt/Co]/IrMn multilayer samples is studied by analyzing the remanence state. Then the sample with two-directional isotropy is measured after perpendicular and in-plane field cooling, we observe an absence of spin flop coupling after field cooling and that the perpendicular exchange bias is larger than the in-plane exchange by: 1.

Exchange Bias Theory. Article (PDF Available) exchange anisotropy based on the assumption of rough F/AF compensated and uncomp en-sated interfaces, as illustrated in Fig.

: Miguel Kiwi. The exchange bias effect, discovered more than fifty years ago, is a fundamental interfacial property, which occurs between ferromagnetic and antiferromagnetic materials. After intensive experimental and theoretical research over the last ten years, a much clearer picture has emerged about this effect, which is of immense technical importance Cited by: Conceptually, the exchange bias corresponds to an exchange field, of the size of the bias field H B, transferred from the surface of the AFM into the FM.

If one assumed an ideal magnetic structure of the AFM where all moments at the AFM/FM interface pointed in one direction as shown on the bottom left in Fig. 1, one might expect that the.

This timely book covers basic mechanisms, characterization, theoretical simulations, and applications for exchange bias in granular nanosystems, thin films, and bulk systems. After an overview of the field and key principles, the next section covers nanogranular (core-shell) systems, followed by chapters on thin films, bilayers/multilayers.

Magnetic relaxation measurements of exchange biased (Pt/Co) multilay ers with perp endicular anisotropy F.

Romanens 1, S. Pizzini 1, J. Sort 2, F. Garcia 2, J. Ca marero 3, F. Y okaichiy a 1. Hoffmann, AThe origin for training effects in exchange bias systems: Frustration and multiple anisotropy axes at the interface. in INTERMAG - IEEE International Magnetics Conference.,INTERMAG - IEEE International Magnetics Conference, INTERMAG - IEEE International Magnetics Conference, San Diego, CA, United States, 5/8/ Valence Electron Magnetic Anisotropy Magnetic Recording Exchange Bias Magnetocrystalline Anisotropy These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm : A. Freeman, K. Nakamura, M. Kim, W. Geng. @article{osti_, title = {NiO/Fe(): Magnetic anisotropy, exchange bias, and interface structure}, author = {Mlynczak, E.

and Luches, P. and Valeri, S. and Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universita di Modena e Reggio Emilia, Via G. Campi /a, Modena and Korecki, J. and Faculty of Physics and Applied Computer Science, AGH University of Science and.

Anisotropy • The Exchange bias should be larger for larger AFM anisotropy. • The main difficulty in analysing these results rises from the fact that they involve mixtures or dilution of AFM materials, therefore the absolute value of anisotropy is usually unknown.

Unidirectional anisotropy (exchange biasing) and isotropic resonance field shifts are observed at the lowest temperatures. Above the apparent exchange bias blocking temperature, isotropic resonance field shifts persist. At still higher temperatures, diminishing resonance field shifts are accompanied by peaks in the FMR : Robert D.

McMichael, C Lee, Mark D. Stiles, F Serpa, P J. Chen, William F. Egelhoff. Magnetic field induced irreversible changes of the exchange anisotropy in Co/CoO bilayers were investigated. Cobalt films were grown by dc magnetron sputtering and then partially oxidized.

They were then field cooled in Oe to K to induce the exchange bias. A variable magnitude magnetic field was applied in the film plane at various angles with respect to the exchange Cited by: This timely book covers basic mechanisms, characterization, theoretical simulations, and applications for exchange bias in granular nanosystems, thin films, and bulk systems.

After an overview of the field and key principles, the next section covers nanogranular (core-shell) systems, followe. The uniaxial magnetic anisotropy of the KNiF 3 is much weaker than that of the FeF 2, and the corresponding exchange bias and exchange anisotropies are also different.

By changing the thickness of the KNiF 3, we show that it is possible to change the exchange anisotropy and bias from that of the FeF 2 to that of the KNiF by: 3. 11 Exchange Bias in Bulk Heusler Systems Jyoti Sharma and K. Suresh. (source: Nielsen Book Data) Summary This timely book covers basic mechanisms, characterization, theoretical simulations, and applications for exchange bias in granular nanosystems, thin films, and bulk systems.

@article{osti_, title = {Exchange anisotropy, engineered coercivity and spintronics in atomically engineered L10 heterostructures}, author = {Krishnan, Kannan M.}, abstractNote = {We identified and investigated some of the scientific and technically most challenging issues in thin film magnetism focusing on epitaxially grown layers of specific L10 ordered, intermetallic.

Get this from a library. Exchange bias: from thin film to nanogranular & bulk systems. [Surender K Sharma, (Professor of physics);] -- "This timely book covers basic mechanisms, characterization, theoretical simulations, and applications for exchange bias in granular nanosystems, thin films, and bulk systems.

After an overview of. induced uniaxial anisotropy R Wu, J B Fu, D Zhou et al.-Recent citations Exchange bias enhancement in FM/AFM bilayers with interface coupling frustrations Xiaozhi Zhan et al-Spin glass properties mapped by coercivity in ferromagnet/spin glass bilayers Xiaodan Chi et al-Interface spins in polycrystalline FeMn/Fe bilayers with small exchange bias.

Competing anisotropies and temperature dependence of exchange bias in Co IrMn metallic wire arrays fabricated by nanoimprint lithography Wei Zhang,1,a Dirk N.

Weiss,2 and Kannan M. Krishnan1,b 1Materials Science and Engineering, University of Washington, Seattle, WashingtonUSA 2Washington Technology Center, Seattle, WashingtonUSA. understanding core issues related to exchange bias such as the possible origins of the hysteresis loop asymmetry and training effects [7].

From the minor loop measurements, EB effects have also been observed in bilayers composed of FM layers with different magnitudes of magnetic anisotropy [7, 8]. The reduction in HEB upon.

Exchange Interaction and Exchange Anisotropy. The origin of the interaction which lines up the spins in a magnetic system is the exchange interaction. When spin magnetic moments of adjacent atoms and make an angle, the exchange energy, between the two moments can be expressed as.

Anisotropy induced large exchange bias behavior in ball milled Ni–Co–Mn–Sb alloys Ajaya K. Nayak,1 Roshnee Sahoo,1 K. Suresh,1,a A. Nigam,2 X. Chen,3 and R. Ramanujan3 1Department of Physics, Indian Institute of Technology Bombay, MumbaiIndia 2Tata Institute of Fundamental Research, Homi Bhabha Road, MumbaiIndia 3School of Materials Science and Engineering.

Abstract Polycrystalline ferromagnet-antiferromagnet bilayers exhibit a wide range of interesting magnetic effects. This paper describes a model for these bilayers which explains not only the unidirectional anisotropy that gives rise to the well known shifted hysteresis loops, but also the hysteretic effects observed in rotational torque and ferromagnetic resonance by: What is anisotropy.

Wiki User 'Exchange bias anisotropy' -- subject- s -: Anisotropy, Spin exchange, Ferromagnetic resonance (read more in Cullity's Book) Asked in Authors, Poets, and. This allows tuning of the anisotropy by controlling the lattice mismatch between the seed layer and the IrMn.

AB - In this paper, we report an enhancement of the anisotropy constant K-AF of IrMn/CoFe exchange bias systems with the variation of the NiCr seed layer thickness. The exploration of exchange bias (EB) on the nanoscale provides a novel approach to improving the anisotropic properties of magnetic nanoparticles for prospective applications in nanospintronics and nanomedicine.

However, the physical origin of EB is not fully understood. Recent advances in chemical synthesis provide a unique opportunity to explore EB in a variety of iron oxide-based Cited by: Current theories for exchange bias (EB) do not satisfactorily predict the EB shift and enhanced coercivity prompting further experimental investigations.

In previous studies, the effects of deposition parameters have been studied by: 2. of such devices is exchange bias (EB) effect. Exchange bias, also known as unidirectional magnetic anisotropy, is a resultant effect of interfacial exchange coupling between ferromagnetic (FM) and antiferromagnetic (AF) layers after cooling the system below to the Néel temperature under an external magnetic field [8, 9].

Below T N it is characteristic of an exchange biased system, exhibiting an exchange bias field of µ o H eb = T and enhanced coercivity of µ o H C = T at by: a controllable exchange coupling mechanism.

Keywords: magnetic nanoparticles, exchange bias, magnetic anisotropy, nanocomposites, Monte Carlo simulations (Some figures may appear in colour only in the online journal) 1. Introduction There has been a lot of interest in the search for multi-functional nanocomposites which forecast a promising future.

The exchange-bias (EB) phenomenon is defined as shift of the hysteresis loop along magnetic field axis, in either negative or positive direction. It is one of the phenomena associated with the exchange anisotropy created at the interface between ferromagnetic Cited by: 1.

Role of anisotropy configuration in exchange-biased systems E. Jime´nez,1,a) J. Camarero,1,2 P. Perna,2 N. Mikuszeit,1 F. Tera´n,2 J. Sort,3 J. Nogue´s,4 J. Garcı´a-Martı´n,5 A. Hoffmann,6 B. Dieny,7 and R. Miranda1,2 1Departamento de Fı´sica de la Materia Condensada and Instituto “Nicola´s Cabrera,” Universidad Auto´noma de Madrid, Madrid, Spain.

Anisotropy is a dependence of energy level on some direction. If the magnetic moments in a material have a bias towards one particular direction (the easy axis) then the material is said to have uniaxial anisotropy, like cobalt. Exchange anisotropy is normally observed at ferromagnetic (FM)/anti-ferromagnetic (AFM) interfaces and also usually at low temperatures.

An effective way to find new single-phase materials with strong exchange bias (EB) and high operation temperatures is required for making them useful in practical applications of future spintronic by: 6.

tional anisotropy eld H EB (the exchange bias eld) is H EB = J EB Mt FM; (1) where J EB is the interfacial exchange bias energy and t FM is the thickness of the FM layer with magnetization M. Equation (1) represents a relation expressing the equilib-rium between the exchange bias energy density J EB=t FM and the Zeeman energy [1].

The main. Isothermal tuning of both the magnitude and the sign of the bias field has been achieved by exploiting a new phenomenon in a system consisting of two orthogonally coupled films: SmCo 5 (out-of-plane anisotropy)–CoFeB (in-plane anisotropy). This has been achieved by using the large dipolar magnetic field of the SmCo 5 layer resulting in the pinning of one of the branches of the hysteresis.

Here, we systematically investigated the influence of ion bombardment with different fluences on the strength and direction of the exchange bias coupling in Au/Co/NiO systems with perpendicular magnetic anisotropy of the Co layer. We found that the direction of the exchange bias coupling can be reversed as a result of ion bombardment performed in an external magnetic field which is in the Cited by: 1.

Magnetism of nanostructured magnets, of size comparable to or smaller than ferromagnetic domain size, offers a great potential for new physics. We present results of a systematic study of magnetic reversal in sub nm nanodots, and how this reversal can be affected by various types of anisotropy, temperature, and exchange bias.

Pages in category "Magnetic ordering" The following 58 pages are in this category, out of 58 total. This list may not reflect recent changes ().Exchange Bias However, due to sizeable AFM anisotropy, the orientation of AFM spins will remain unchanged. As a result, the AFM spins at the interface will exert microscopic torque on the FM spins in order tomaintain ferromagnetic coupling.

As the temperature falls below T .Perpendicular exchange bias and magnetic anisotropy in CoOÕpermalloy multilayers S.

M. Zhou,1,2 L. Sun,3 P. C. Searson,3 and C. L. Chien1 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MarylandUSA 2Surface Physics Laboratory (State Key Laboratory) and Department of Physics, Fudan University, ShanghaiChina 3Department of Materials Science .