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Theoretical study of thermally activated magnetization switching under microwave assistance: Switching paths and barrier height

机译:微波辅助下热激活磁化转换的理论研究:转换路径和势垒高度

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摘要

Energy barrier height for magnetization switching is theoretically studied for a system with uniaxial anisotropy in a circularly polarized microwave magnetic field. A formulation of the Landau-Lifshitz-Gilbert equation in a rotating frame introduces an effective energy that includes the effects of both the microwave field and static field. This allows the effective-energy profiles to rigorously describe the switching paths and corresponding barrier height, which govern thermally activated magnetization switching under microwave assistance. We show that fixed points and limit cycles in the rotating frame lead to various switching paths and that under certain conditions, switching becomes a two-step process with an intermediate state.
机译:对于圆极化微波磁场中具有单轴各向异性的系统,理论上研究了磁化转换的能垒高度。在旋转框架中制定Landau-Lifshitz-Gilbert方程可引入有效能量,其中包括微波场和静态场的影响。这允许有效能量分布图严格描述切换路径和相应的势垒高度,它们控制微波辅助下的热激活磁化切换。我们证明了旋转框架中的固定点和极限循环会导致各种切换路径,并且在某些条件下,切换成为具有中间状态的两步过程。

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  • 来源
    《Physical review》 |2015年第9期|094401.1-094401.8|共8页
  • 作者单位

    Corporate Research and Development Center, Toshiba Corporation, Komukai-Toshiba-cho 1, Saiwai-ku, Kawasaki 212-8582, Japan;

    Corporate Research and Development Center, Toshiba Corporation, Komukai-Toshiba-cho 1, Saiwai-ku, Kawasaki 212-8582, Japan;

    Corporate Research and Development Center, Toshiba Corporation, Komukai-Toshiba-cho 1, Saiwai-ku, Kawasaki 212-8582, Japan;

    Corporate Research and Development Center, Toshiba Corporation, Komukai-Toshiba-cho 1, Saiwai-ku, Kawasaki 212-8582, Japan;

    Corporate Research and Development Center, Toshiba Corporation, Komukai-Toshiba-cho 1, Saiwai-ku, Kawasaki 212-8582, Japan;

    Corporate Research and Development Center, Toshiba Corporation, Komukai-Toshiba-cho 1, Saiwai-ku, Kawasaki 212-8582, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan;

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  • 正文语种 eng
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  • 关键词

    magnetization reversal mechanisms; ferromagnetic; antiferromagnetic; and ferrimagnetic resonances; spin-wave resonance; magnetic thin film devices: magnetic heads (magnetoresistive; inductive; etc.); domain-motion devices; etc.;

    机译:磁化反转机制;铁磁;反铁磁和亚铁磁共振;自旋波共振磁性薄膜设备:磁头(磁阻;感应等);域运动设备;等等;

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