Spin transfer torque switching of cobalt nanoparticles

Wang, X. J.; Zou, H.; Ji, Y.
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p162501
Academic Journal
Magnetization reversals of cobalt nanoparticles induced by spin transfer torque are demonstrated at 4.2 K by a mechanical point-contact made on a Co/Cu/Co trilayer thin film. The top Co layer (∼0.5 nm) is discontinuous and consists of isolated cobalt nanoparticles with a diameter of <5 nm. The number of nanoparticles underneath a point contact can be controlled by varying the size of the contact. The characteristics of spin transfer switching are qualitatively different for contacts involving a few particles (5–10) and those involving many particles (40–50).


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