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首页> 外文期刊>Physical review >Thickness-dependent magnetoelasticity and its effects on perpendicular magnetic anisotropy in Ta/CoFeB/MgO thin films
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Thickness-dependent magnetoelasticity and its effects on perpendicular magnetic anisotropy in Ta/CoFeB/MgO thin films

机译：Ta / CoFeB / MgO薄膜中厚度依赖的磁弹性及其对垂直磁各向异性的影响

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摘要

We report measurements of the in-plane magnetoelastic coupling in both as-deposited and annealed ultrathin Ta/CoFeB/MgO layers as a function of uniaxial strain, conducted using a four-point bending apparatus. While as-deposited samples show only a weak dependence of the magnetoelastic coupling on the CoFeB layer thickness in the ultrathin regime (＜2 nm), we observe the onset of a strong thickness dependence upon annealing. This dependence can be modeled as arising from a combination of effective surface and volume contributions to the magnetoelastic coupling. We point out that if similar thickness dependence exists for magnetoelastic coupling in response to biaxial strain, then the standard Neel model for the magnetic anisotropy energy acquires a term inversely proportional to the magnetic layer thickness. This contribution can significantly change the overall magnetic anisotropy, and provides a natural explanation for the strongly nonlinear dependence of magnetic anisotropy energy on magnetic layer thickness that is commonly observed for ultrathin annealed CoFeB/MgO films with perpendicular magnetic anisotropy.
机译：我们报告了使用四点弯曲装置进行的沉积和退火的超薄Ta / CoFeB / MgO层中作为单轴应变函数的面内磁弹性耦合的测量。虽然沉积的样品在超薄状态（＜2 nm）中仅显示出磁弹性耦合对CoFeB层厚度的弱依赖性，但我们观察到退火对厚度的依赖性很强。可以将这种依赖关系建模为有效表面和体积对磁弹耦合的贡献的组合。我们指出，如果响应双轴应变，磁弹性耦合存在类似的厚度依赖性，则用于磁各向异性能量的标准Neel模型将获得与磁层厚度成反比的项。这种贡献可以显着改变整体的磁各向异性，并为磁各向异性能量对磁性层厚度的强烈非线性依赖性提供了自然的解释，这在具有垂直磁各向异性的超薄退火CoFeB / MgO薄膜中通常观察到。

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  • 来源
    《Physical review》 |2016年第2期|024404.1-024404.6|共6页
  • 作者

    P. G. Gowtham; G. M. Stiehl; D. C. Ralph; R. A. Buhrman;

  • 作者单位

    Cornell University, Ithaca, New York 14853, USA;

    Cornell University, Ithaca, New York 14853, USA;

    Cornell University, Ithaca, New York 14853, USA,Kavli Institute at Cornell, Ithaca, New York 14853, USA;

    Cornell University, Ithaca, New York 14853, USA;

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