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首页> 外文期刊>Physical review >Nonuniform switching of the perpendicular magnetization in a spin-torque-driven magnetic nanopillar
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Nonuniform switching of the perpendicular magnetization in a spin-torque-driven magnetic nanopillar

机译：自旋转矩驱动的磁性纳米柱中垂直磁化强度的非均匀切换

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摘要

Time-resolved scanning transmission x-ray microscopy measurements were performed to study the current-induced magnetization switching mechanism in nanopillars exhibiting strong perpendicular magnetic anisotropy. This technique provides both short-time (70 ps) and high-spatial (25 nm) resolutions. Direct imaging of the magnetization demonstrates that, after an incubation time of ~1.3 ns,a 100 × 300 nm~2 ellipsoidal device switches in ~1 ns via a central domain nucleation and opposite propagation of two domain walls toward the edges. High domain-wall velocities on the order of 100 m/s are measured. Micromagnetic simulations are shown to be in good agreement with experimental results and provide insight into magnetization dynamics during the incubation and reversal periods.
机译：进行了时间分辨的扫描透射X射线显微镜测量，以研究表现出强垂直磁各向异性的纳米柱中电流感应的磁化转换机制。该技术可提供短时（70 ps）和高空间（25 nm）分辨率。磁化强度的直接成像表明，在〜1.3 ns的孵育时间后，一个100×300 nm〜2椭圆形器件通过中心畴核和两个畴壁向边缘的相反传播而在〜1 ns内切换。测量的高畴壁速度约为100 m / s。结果表明，微磁模拟与实验结果非常吻合，可以洞悉孵育和反转期间的磁化动力学。

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  • 来源
    《Physical review》 |2011年第18期|p.180410.1-180410.4|共4页
  • 作者

    David P. Bernstein; Bjorn Brauer; Roopali Kukreja; Joachim Stohr; Thomas Hauet; Julien Cucchiara; Stephane Mangin; Jordan A. Katine; Tolek Tyliszczak; Kang W. Chou; Yves Acremann;

  • 作者单位

    Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    Institut Jean Lamour, CNRS-Nancy Universite-UPVMetz, Vandoeuvre les Nancy, France Hitachi Global Storage Technologies, San Jose, California 95119-1103, USA;

    Institut Jean Lamour, CNRS-Nancy Universite-UPV Metz, Vandoeuvre les Nancy, France;

    Institut Jean Lamour, CNRS-Nancy Universite-UPV Metz, Vandoeuvre les Nancy, France;

    Hitachi Global Storage Technologies, San Jose, California 95119-1103, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, California 94720, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, California 94720, USA;

    Laboratory for Solid State Physics, ETH Zurich, Switzerland;

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  • 正文语种 eng
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  • 关键词

    magnetic anisotropy; domain structure (including magnetic bubbles); magnetooptical effects;

    机译：磁各向异性畴结构（包括磁性气泡）;磁光效应;

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