Spin-current effect on ferromagnetic resonance in patterned magnetic thin film structures
Spin-current effect on ferromagnetic resonance in patterned magnetic thin film structures
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DOI：
10.1063/1.1846945
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发表时间：
2005-01
影响因子：
3.2
通讯作者：
Haiwen Xi;Yiming Shi;K. Gao
中科院分区：
文献类型：
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作者：
Haiwen Xi;Yiming Shi;K. Gao
在线性化条件下，我们利用修正的Landau-Lifshitz-Gilbert方程，从理论上研究了自旋转移扭矩对磁性薄膜结构铁磁共振的影响。研究表明，自旋电流并不改变共振场，而是改变了共振幅度和线宽。在这种情况下，铁磁共振可以用有效的阻尼常数来表征。根据自旋电流的方向，它可以将能量输送到磁系统中或从磁系统中耗散能量。此外，还可以通过改变电流强度来调节谐振的品质因数。文中还对交流电流激励下的铁磁共振进行了理论论证和讨论。
We have theoretically investigated the ferromagnetic resonance in the magnetic thin film structures under the influence of spin-transfer torque using a modified Landau–Lifshitz–Gilbert equation in the linearization regime. The study shows that spin currents do not shift the resonance field but rather change both the resonance amplitude and the linewidth. Ferromagnetic resonance under this circumstance can be characterized by an effective damping constant. Depending upon its direction, the spin current can pump energy into or dissipate energy from the magnetic system. In addition, the quality factor of the resonance can be tuned by changing the current intensity. Ferromagnetic resonance excited by ac electrical currents is also theoretically demonstrated and discussed in this article.