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Temperature dependence of the switching field in all-perpendicular spin-valve nanopillars

机译:全垂直自旋阀纳米柱中开关场的温度依赖性

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We present temperature dependent switching measurements of the Co/Ni multilayered free element of 75-nm-diameter spin-valve nanopillars. Angular dependent hysteresis measurements as well as switching field measurements taken at low temperature are in agreement with a model of thermal activation over a perpendicular anisotropy barrier. However, the statistics of switching (i.e. the mean switching field and the variance of the switching field distribution) from 20 up to 400 K are in disagreement with a Neel-Brown model that assumes a temperature independent barrier height and anisotropy field. We introduce a modified Neel-Brown model that fits the experimental data in which we attribute a T~(3/2) dependence to the barrier height and the anisotropy field due to the temperature dependent magnetization and anisotropy energy.
机译:我们提出了直径为75 nm的旋转阀纳米柱的Co / Ni多层自由元素的温度依赖性开关测量。依赖于角度的磁滞测量值以及在低温下进行的开关场测量值与垂直各向异性势垒上的热激活模型一致。但是,从20到400 K的转换统计量(即,平均转换场和转换场分布的方差)与假设温度独立的势垒高度和各向异性场的Neel-Brown模型不一致。我们引入了一个适应实验数据的改进的Neel-Brown模型,在该模型中,由于温度相关的磁化强度和各向异性能,我们将T〜(3/2)依赖关系归因于势垒高度和各向异性场。

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