Changing exchange bias in spin valves with an electric current.
We show that a high-density electric current, injected from a point contact into an exchange-biased spin valve, systematically changes the exchange bias. The bias can either increase or decrease depending upon the current direction. This observation is not readily explained by the well-known spin-transfer torque effect in ferromagnetic metal circuits, but could be evidence for the recently predicted current-induced torques in antiferromagnetic metals.
Wei
Z
Z
Physics Department, University of Texas at Austin, Austin, Texas 78712, USA.
Sharma
A
A
Nunez
A S
AS
Haney
P M
PM
Duine
R A
RA
Bass
J
J
MacDonald
A H
AH
Tsoi
M
M