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Influence of temperature on the gyrotropic eigenmode of magnetic vortices

机译:温度对磁涡旋回旋本征模的影响

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摘要

Magnetic vortices in ferromagnetic thin-film structures can be excited to gyrate resonantly at a characteristic eigenfrequency. The influence of temperature on the gyrotropic eigenfrequency of vortices in micrometer-sized permalloy squares is studied. Ferromagnetic absorption measurements around room temperature show that the eigenfrequency is decreased by 5.4% when the temperature is increased by 100 ℃. The lowering of the saturation magnetization and the associated modification of the potential of gyration is discussed as a reason for the frequency shift within the model of the harmonic oscillator. Micromagnetic simulations confirm a linear relation between the eigenfrequency and the saturation magnetization. Absorption measurements under application of static external magnetic fields yield the same percentage frequency shift as without external field when gyrations around equally displaced equilibrium positions are compared.
机译:可以激发铁磁薄膜结构中的磁涡流,使其以特征本征频率共振地旋转。研究了温度对微米级坡莫合金正方形中涡旋回旋本征频率的影响。室温附近的铁磁吸收测量结果表明,温度升高100℃,本征频率降低5.4%。讨论了饱和磁化强度的降低以及回转电位的相关修改,这是谐波振荡器模型内频率偏移的原因。微磁模拟证实了本征频率和饱和磁化强度之间的线性关系。当比较围绕相同位移的平衡位置的回转时,在施加静态外部磁场的情况下进行的吸收测量会产生与没有外部磁场时相同的频率偏移百分比。

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  • 来源
    《Physical review》 |2011年第22期|p.224424.1-224424.6|共6页
  • 作者单位

    Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, D-20355 Hamburg, Germany;

    Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, D-20355 Hamburg, Germany;

    Arbeitsbereich Technische Informatiksysteme, Universitaet Hamburg, D-22527 Hamburg, Germany;

    Institut fuer Theoretische Physik, Universitaet Hamburg, D-20355 Hamburg, Germany;

    Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, D-20355 Hamburg, Germany;

    Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, D-20355 Hamburg, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance; X-ray microscopy;

    机译:铁磁;反铁磁和亚铁磁谐振;自旋波共振X射线显微镜;

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