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首页> 外文期刊>Physical review >Symmetric magnetization reversal in polycrystalline exchange coupled systems via simultaneous processes of coherent rotation and domain nucleation
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Symmetric magnetization reversal in polycrystalline exchange coupled systems via simultaneous processes of coherent rotation and domain nucleation

机译：通过相干旋转和畴成核的同时过程，在多晶交换耦合系统中实现对称磁化反转

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摘要

Training in exchange bias systems plays an essential role in understanding the very origin of the biasing effect. The nonequilibrium arrangement of antiferromagnetic (AF) spins at the antiferromagnetic-ferromagnetic interface, related to the AF uniaxial anisotropy, plays a crucial role during the initial training. Our system of choice, IrMn/CoFe, possesses softer uniaxial anisotropy compared to other AF systems (e.g., CoO), thereby reducing the energy penalty due to nonequilibrium spins. Different methods have been applied to initialize or modify the unidirectional anisotropy. We apply an in-plane field (a) during field growth, (b) during field cooling below its blocking temperature, and (c) in an in-plane magnetic field during ion irradiation, along and opposite the field applied during field growth. Magnetization reversal mechanisms were investigated during the first two field cycles to identify the role of each method on the training. A detailed analysis of polarized neutron scattering using the distorted wave Born approximation reveals a simultaneous process of domain nucleation and coherent rotation for magnetization reversal.
机译：交流偏见系统的培训在理解偏见效应的根源方面起着至关重要的作用。反铁磁（AF）自旋在反铁磁-铁磁界面处的非平衡排列与AF单轴各向异性有关，在初始训练中起着至关重要的作用。与其他AF系统（例如CoO）相比，我们选择的系统IrMn / CoFe具有更柔和的单轴各向异性，从而减少了由于非平衡自旋引起的能量损失。已经应用了不同的方法来初始化或修改单向各向异性。我们在场生长期间施加平面电场，（b）在低于其阻断温度的场冷却期间施加磁场，（c）在离子辐照期间在平面磁场中施加磁场，其方向与场生长期间施加的磁场相反。在头两个磁场周期中研究了磁化反转机制，以确定每种方法在训练中的作用。使用失真波博恩近似对极化中子散射进行的详细分析揭示了磁化反转的畴核和相干旋转的同时过程。

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  • 来源
    《Physical review》 |2012年第9期|p.094420.1-094420.14|共14页
  • 作者

    Amitesh Paul; C. Schmidt; N. Paul; A. Ehresmann; Stefan Mattauch; Peter Boeni;

  • 作者单位

    Technische Universitaet Muenchen, Physik Department E21, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse I, D-85748 Garching b. Muenchen, Germany;

    Universitaet Kassel, Institut fuer Physik and Centre for Interdisciplinary Nanostructure Science and Technology (CINSaT), Experimentalphysik IV, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie GmbH, Hahn-Meitner-Platz I, D-14109 Berlin, Germany;

    Universitaet Kassel, Institut fuer Physik and Centre for Interdisciplinary Nanostructure Science and Technology (CINSaT), Experimentalphysik IV, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany;

    Juelich Centre for Neutron Science Forschungszentrum Juelich GmbH, Aussenstelle am FRM-II c/o TU Muenchen, Lichtenbergstrasse 1, D-85747 Garching b. Muenchen, Germany;

    Technische Universitaet Muenchen, Physik Department E21, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse I, D-85748 Garching b. Muenchen, Germany;

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  • 正文语种 eng
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  • 关键词

    magnetic properties of interfaces (multilayers, superlattices, heterostructures); magnetic anisotropy; ion radiation effects;

    机译：界面的磁性（多层;超晶格;异质结构）;磁各向异性离子辐射效应;

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