Petit S, Baraduc C, Thirion C, Ebels U, Liu Y, Li M, Wang P, Dieny B
SPINTEC, URA 2512 CEA/CNRS, CEA/Grenoble, 38054 Grenoble Cedex 9, France.
Phys Rev Lett. 2007 Feb 16;98(7):077203. doi: 10.1103/PhysRevLett.98.077203. Epub 2007 Feb 12.
Voltage noise measurements were performed in the 3-7 GHz frequency range on magnetic tunnel junctions biased with a dc current. Magnetic noise associated with ferromagnetic resonance excitations is either amplified or reduced depending on the direction of the bias current. This effect is interpreted as the influence of spin transfer torque on the magnetization fluctuations and described using Gilbert dynamics equation including spin transfer torque and effective field terms.
在3 - 7GHz频率范围内，对由直流电流偏置的磁性隧道结进行了电压噪声测量。与铁磁共振激发相关的磁噪声会根据偏置电流的方向而放大或减小。这种效应被解释为自旋转移矩对磁化涨落的影响，并使用包含自旋转移矩和有效场项的吉尔伯特动力学方程进行描述。
