Current-driven magnetic excitations in permalloy-based multilayer nanopillars

被引：266
|
作者：
Urazhdin, S [1 ]
Birge, NO
Pratt, WP
Bass, J
机构：
[1] Michigan State Univ, Ctr Fundamental Mat Res, Dept Phys & Astron, E Lansing, MI 48824 USA
[2] Michigan State Univ, Ctr Sensor Mat, E Lansing, MI 48824 USA
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 14期
关键词：
D O I：
10.1103/PhysRevLett.91.146803
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study current-driven magnetization switching in nanofabricated Ni84Fe16/Cu/Ni84Fe16 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.
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页数：4
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