Current-driven magnetic excitations in permalloy-based multilayer nanopillars.
Current-driven magnetic excitations in permalloy-based multilayer nanopillars.
复制标题
DOI：
10.1103/physrevlett.91.146803
复制
发表时间：
2003-03
影响因子：
8.6
通讯作者：
S. Urazhdin;N. Birge;William P. Pratt;Jack Bass
中科院分区：
文献类型：
--
作者：
S. Urazhdin;N. Birge;William P. Pratt;Jack Bass
研究了295和4.2 K下纳米Ni（84）Fe（16）/Cu/Ni（84）Fe（16）三层膜中电流驱动的磁化翻转。在低磁场下，滞后开关图的形状随温度而变化。在更高的领域的可逆行为涉及两种现象，一个阈值电流的磁激励密切相关的开关电流，和一个峰值的微分电阻的特点是电报噪声，与平均周期，电流呈指数下降，随温度变化。我们解释静态和动态的结果在295和4.2 K的热激活势垒，与电流相关的有效磁温度。
We study current-driven magnetization switching in nanofabricated Ni(84)Fe(16)/Cu/Ni(84)Fe16 trilayers at 295 and 4.2 K. The shape of the hysteretic switching diagram at low magnetic field changes with temperature. The reversible behavior at higher fields involves two phenomena, a threshold current for magnetic excitations closely correlated with the switching current, and a peak in differential resistance characterized by telegraph noise, with an average period that decreases exponentially with current and shifts with temperature. We interpret both static and dynamic results at 295 and 4.2 K in terms of thermal activation over a potential barrier, with a current-dependent effective magnetic temperature.