Spin-transfer-driven ferromagnetic resonance of individual nanomagnets.
We demonstrate a technique that enables ferromagnetic resonance measurements of the normal modes for magnetic excitations in individual nanoscale ferromagnets, smaller in volume by more than a factor of 50 compared to individual ferromagnetic samples measured by other resonance techniques. Studies of the resonance frequencies, amplitudes, linewidths, and line shapes as a function of microwave power, dc current, and magnetic field provide detailed new information about the exchange, damping, and spin-transfer torques that govern the dynamics in magnetic nanostructures.
Sankey
J C
JC
Cornell University, Ithaca, New York 14853, USA.
Braganca
P M
PM
Garcia
A G F
AG
Krivorotov
I N
IN
Buhrman
R A
RA
Ralph
D C
DC