title: Domain-wall dynamics and spin-wave excitations with spin-transfer torques.
abstract: A generalization of spin-transfer torques in ferromagnetic structures is proposed. For a spatially nonuniform magnetization, the spin torque has a form nearly identical to that in magnetic multilayers. We show that the domain-wall motion driven by the current has many unique features that do not exist in the conventional domain-wall motion driven by a magnetic field. We also demonstrate that the spin torque can generate bulk and surface spin excitations that have been seen in point-contact experiments.
authors.affiliation: Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Li
authors.forename: S
authors.initials: S
authors.lastname: Zhang