title: Current driven domain wall motion in rare-earth transition metal alloys with perpendicular magnetic anisotropy.
abstract: The domain wall movement behaviors under current combining with magnetic field in perpendicularly magnetized TbFeCo wire were studied by a polar magneto-optical Kerr effect microscope. The velocity for domain wall creeping along electrons flowing direction was found to be apparently higher than that of domain wall creeping against electrons flowing, which is the signature of the spin transfer torque effect. By employing the modified field-driven creep motion law, a spin transfer efficiency of 2.7 Oe cm2/10(6) A was determined for TbFeCo wire by treating the spin transfer torque as an effective field adding to the external field. The high spin transfer efficiency suggests that perpendicularly magnetized system with sharp domain walls in TbFeCo film shows high superiorities for applications in spin transfer torque based devices compared with in-plane magnetized systems.
authors.affiliation: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan.
authors.forename: Songtian
authors.initials: S
authors.lastname: Li
authors.forename: Xiaoxi
authors.initials: X
authors.lastname: Liu
authors.forename: Akimistu
authors.initials: A
authors.lastname: Morisako