title: Spin-wave excitation in magnetic insulators by spin-transfer torque.
abstract: We study the excitation of spin waves in magnetic insulators by the current-induced spin-transfer torque. We predict preferential excitation of surface spin waves induced by an easy-axis surface anisotropy with critical current inversely proportional to the penetration depth and surface anisotropy. The surface modes strongly reduce the critical current and enhance the excitation power of the current-induced magnetization dynamics.
authors.affiliation: Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Xiao
authors.forename: Gerrit E W
authors.initials: GE
authors.lastname: Bauer