Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Injection Locking and Phase Control of Spin Transfer Nano-Oscillators



William Rippard, Matthew Pufall, Shehzaad F. Kaka, Thomas J. Silva, Stephen E. Russek, Jordan A. Katine


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 ±90degrees} relative to the input. This is in good agreement with general theoretical analysis of injection locking of nonlinear oscillators.
Physical Review Letters


injection locking, Spin transfer


Rippard, W. , Pufall, M. , Kaka, S. , Silva, T. , Russek, S. and Katine, J. (2005), Injection Locking and Phase Control of Spin Transfer Nano-Oscillators, Physical Review Letters, [online], (Accessed June 22, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created August 4, 2005, Updated October 12, 2021