Spin torque influence on the high frequency magnetization fluctuations in magnetic tunnel junctions
Fri, Jan. 26th 2007, 11:00
Bât. 1005 P.434D, CEA-Grenoble
Voltage noise measurements were performed in the 3-7 GHz frequency range on magnetic tunnel junctions biased with a DC current. Magnetic noise associated with ferromagnetic resonance excitations is either amplified or reduced depending on the direction of the bias current. This effect is interpreted as the influence of spin transfer torque on the magnetization fluctuations and described using Gilbert dynamics equation including spin transfer torque and effective field terms.