Unidirectional propagation of magnetostatic surface spin waves at a magnetic film surface

Wong Kin L. , Bi Lei , Bao Mingqiang , Wen Qiye , Jean-Pierre Chatelon (1, 2) , Yen-Ting Lin , C.A. Ross , Zhang Huaiwu , Wang Kang L

1 LT2C - Laboratoire Telecom Claude Chappe
2 LHC - Laboratoire Hubert Curien

An analytical expression for the amplitudes of magnetostatic surface spin waves (MSSWs)propagating in opposite directions at a magnetic film surface is presented. This shows that for agiven magnetic field H, it is forbidden for an independent MSSW to propagate along the directionof -H~n, where n is the surface normal. This unidirectional propagation property is confirmedby experiments with both permalloy and yttrium iron garnet films of different film thicknesses, andhas implications in the design of spin-wave devices such as isolators and spin-wave diodes

Domaines: Electromagnétisme; Micro et nanotechnologies/Microélectronique

Wong Kin L., Bi Lei, Bao Mingqiang, Wen Qiye, Jean-Pierre Chatelon, et al.. Unidirectional propagation of magnetostatic surface spin waves at a magnetic film surface. Applied Physics Letters, 2014, 105, pp.232403. ⟨10.1063/1.4903742⟩. ⟨hal-01092593⟩