Thermal Effects in Spin-Torque Switching of Perpendicular Magnetic Tunnel Junctions at Cryogenic Temperatures

L. Rehm, G. Wolf, B. Kardasz, Egecan Cogulu, Yizhang Chen, M. Pinarbasi, A. Kent
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引用次数: 3

Abstract

Temperature plays an important role in spin torque switching of magnetic tunnel junctions causing magnetization fluctuations that decrease the switching voltage but also introduce switching errors. Here we present a systematic study of the temperature dependence of the spin torque switching probability of state-of-the-art perpendicular magnetic tunnel junction nanopillars (40 to 60 nm in diameter) from room temperature down to 4 K, sampling up to a million switching events. The junction temperature at the switching voltage---obtained from the thermally assisted spin torque switching model---saturates at temperatures below about 75 K, showing that junction heating is significant below this temperature and that spin torque switching remains highly stochastic down to 4 K. A model of heat flow in a nanopillar junction shows this effect is associated with the reduced thermal conductivity and heat capacity of the metals in the junction.
低温下垂直磁隧道结自旋转矩开关的热效应
温度在磁隧道结的自旋转矩开关中起着重要的作用,引起磁化波动,使开关电压降低,但也会引入开关误差。在这里,我们系统地研究了最先进的垂直磁隧道结纳米柱(直径40至60纳米)从室温到4 K的自旋转矩开关概率的温度依赖性,采样了多达一百万次的开关事件。从热辅助自旋转矩开关模型获得的开关电压下的结温在低于约75 K的温度下达到饱和,表明结加热在此温度以下是显著的,并且自旋转矩开关在4 K以下仍然是高度随机的。纳米柱结中的热流模型表明,这种效应与结中金属的热导率和热容的降低有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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