Mutual phase locking in high-frequency microwave nano-oscillators as a function of field angle

[摘要] We perform a qualitative analysis of phase locking in a double point-contact spin-valve system by solving the Landau -Lifshitz-Gilbert-Slonzewski equation using a hybrid-finite-element method. We show that the phase-locking behaviour depends on the applied field angle. Starting from a low field angle, the locking-current difference between the current through contact A and B increases with increasing angle up to a maximum of 14 mA at 30 degrees, and it decreases thereafter until it reaches a minimum of 1 mA at 75 degrees. The tunability of the phase-lock frequency with current decreases linearly with increasing out-of-plane angle from 45 to 21 MHz/mA. (C) 2008 Elsevier B. V. All rights reserved.

[发布日期] 2008-09-01

[关键词] magnetic nano-oscillator;high-frequency oscillator;spin torque;phase locking;spin valve