Current-induced magnetization reversal in high magnetic fields in Co/Cu/Co nanopillars
Current-induced magnetization reversal in high magnetic fields in Co/Cu/Co nanopillars
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DOI：
10.1103/physrevlett.91.067203
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发表时间：
2003-08-08
影响因子：
8.6
通讯作者：
Koch, RH
中科院分区：
文献类型：
--
作者：
Ozyilmaz, B;Kent, AD;Koch, RH
实验研究了Co/Cu/Co三层纳米管(直径约100 nm)在垂直于层的大外加磁场下的电流感应磁化动力学。在4.2K时，在高电流密度下观察到单极性电流的电阻突变和滞后增加，这与低场下观察到的巨磁电阻效应相当。包括自旋转移扭矩的微磁模型表明，电流诱导薄钴层完全反转，以反平行于所施加的磁场--即到最大磁能的状态。
Current-induced magnetization dynamics in Co/Cu/Co trilayer nanopillars (similar to100 nm in diameter) have been studied experimentally at low temperatures for large applied fields perpendicular to the layers. At 4.2 K an abrupt and hysteretic increase in resistance is observed at high current densities for one polarity of the current, comparable to the giant magnetoresistance effect observed at low fields. A micromagnetic model that includes a spin-transfer torque suggests that the current induces a complete reversal of the thin Co layer to alignment antiparallel to the applied field-that is, to a state of maximum magnetic energy.