Current-driven resonant excitation of magnetic vortices
Current-driven resonant excitation of magnetic vortices
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DOI：
10.1103/physrevlett.97.107204
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发表时间：
2006-09-08
影响因子：
8.6
通讯作者：
Ono, Teruo
中科院分区：
文献类型：
--
作者：
Kasai, Shinya;Nakatani, Yoshinobu;Ono, Teruo
铁磁圆形纳米点中的磁涡核具有源于涡核限制的共振频率。通过包含自旋转移力矩的微磁模拟，我们发现涡旋核可以被通过点的交流(自旋极化)电流共振激励，并且共振频率可以通过点的形状来调节。交流电流下的电阻测量成功检测到与仿真结果一致的频率处的谐振。
A magnetic vortex core in a ferromagnetic circular nanodot has a resonance frequency originating from the confinement of the vortex core. By the micromagnetic simulation including the spin-transfer torque, we show that the vortex core can be resonantly excited by an ac (spin-polarized) current through the dot and that the resonance frequency can be tuned by the dot shape. The resistance measurement under the ac current successfully detects the resonance at the frequency consistent with the simulation.