Kasai Shinya, Nakatani Yoshinobu, Kobayashi Kensuke, Kohno Hiroshi, Ono Teruo
Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan.
Phys Rev Lett. 2006 Sep 8;97(10):107204. doi: 10.1103/PhysRevLett.97.107204. Epub 2006 Sep 6.
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.
铁磁圆形纳米点中的磁涡旋核具有源于涡旋核限制的共振频率。通过包括自旋转移扭矩的微磁模拟，我们表明涡旋核可以被通过该点的交流（自旋极化）电流共振激发，并且共振频率可以通过点的形状进行调谐。在交流电流下的电阻测量成功地检测到了与模拟一致频率的共振。
