Rippard W H, Pufall M R, Kaka S, Silva T J, Russek S E, Katine J A
National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
Phys Rev Lett. 2005 Aug 5;95(6):067203. doi: 10.1103/PhysRevLett.95.067203.
We have directly measured phase locking of spin transfer oscillators to an injected ac current. The oscillators lock to signals up to several hundred megahertz away from their natural oscillation frequencies, depending on the relative strength of the input. As the dc current varies over the locking range, time-domain measurements show that the phase of the spin transfer oscillations varies over a range of approximately +/-90 degrees relative to the input. This is in good agreement with general theoretical analysis of injection locking of nonlinear oscillators.
我们已经直接测量了自旋转移振荡器与注入交流电流的锁相情况。振荡器能够锁定到距离其固有振荡频率数百兆赫兹的信号，这取决于输入的相对强度。当直流电流在锁定范围内变化时，时域测量表明，自旋转移振荡的相位相对于输入在大约±90度的范围内变化。这与非线性振荡器注入锁定的一般理论分析结果非常吻合。
