• Title/Summary/Keyword: Spin exchange

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Studies of Effects of Current on Exchange-Bias: A Brief Review

  • Bass, J.;Sharma, A.;Wei, Z.;Tsoi, M.
    • Journal of Magnetics
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    • v.13 no.1
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    • pp.1-6
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    • 2008

  • MacDonald and co-workers recently predicted that high current densities could affect the magnetic order of antiferromagnetic (AFM) multilayers, in ways similar to those that occur in ferromagnetic (F) multilayers, and that changes in AFM magnetic order can produce an antiferromagnetic Giant Magnetoresistance (AGMR). Four groups have now studied current-driven effects on exchange bias at F/AFM interfaces. In this paper, we first briefly review the main predictions by MacDonald and co-workers, and then the results of experiments on exchange bias that these predictions stimulated.

  • https://doi.org/10.4283/JMAG.2008.13.1.001 인용 PDF KSCI

Exchange Bias Modifications in NiFe/FeMn/NiFe Trilayer by a Nonmagnetic Interlayer

  • Yoon, S.M.;Sankaranarayanan V.K.;Kim, C.O.;Kim, C.G.
    • Journal of Magnetics
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    • v.10 no.3
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    • pp.99-102
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    • 2005

  • Modification in exchange bias of a NiFe/FeMn/NiFe trilayer, on introduction of a nonmagnetic Al layer at the top FeMn/NiFe interface, is investigated in multilayers prepared by rf magnetron sputtering. The introduction of Al layer leads to vanishing of bias of the top NiFe layer. But the bias for the bottom NiFe layer increases steadily with increasing Al layer thickness and attains bias (230 Oe) which is greater than that of the trilayer without the Al layer (150 Oe). When the top NiFe layer thickness is varied, exchange bias has highest value at 12 nm thickness for 1 nm thicknes of Al layer. Ion beam etching of the top NiFe layer also leads to an enhancement in bias for the bottom NiFe layer.

  • https://doi.org/10.4283/JMAG.2005.10.3.099 인용 PDF KSCI

Electronic and magnetic structure calculations of $La_2MnFeO_6$ with double perovskite oxide (이중 페로브스카이트 구조 $La_2MnFeO_6$의 전자구조와 자기구조 계산)

  • 박기택
    • Journal of the Korean Magnetics Society
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    • v.10 no.3
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    • pp.139-142
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    • 2000

  • We present results based on FLAPW local spin density(LSD) calculations of double perovskite structure oxide L $a_2$MnFe $O_{6}$ . The total energy calculations with various spin structures show that this material has a stable ferromagnetic spin configuration. The ionic state of transition metals depend on the spin configuration $_Mn^{4+}$ and F $e^{2+}$ for ferromagnetic structure, M $n^{3+}$ and F $e^{3+}$ for ferrimagnetic structure). It is explained by super exchange interaction between transition metals. The calculated magnetic structure is well matched with recent experimental result.ult.t.

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