We investigated the microwave oscillation of resistance due to spin-transfer torque in ferromagnetic nano-contact spin-valves under an external in-plane magnetic field. We varied the direction of the external magnetic field and therefore the relative angle, θ, between magnetizations of the free and reference layers. We showed that the level of microwave oscillation takes a maximum value at around θ =140°. We also showed that the microwave oscillation frequency increases with increases in the applied direct current.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)