Unidirectional propagation of magnetostatic surface spin waves at a magnetic film surface
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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 a given magnetic field H, it is forbidden for an independent MSSW to propagate along the direction of -[arrow over H] x -[arrow overn] where [arrow over n] is the surface normal. This unidirectional propagation property is confirmed by experiments with both permalloy and yttrium iron garnet films of different film thicknesses, and has implications in the design of spin-wave devices such as isolators and spin-wave diodes.
Date issued
2014-12Department
Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Wong, Kin L., Lei Bi, Mingqiang Bao, Qiye Wen, Jean Pierre Chatelon, Yen-Ting Lin, C. A. Ross, Huaiwu Zhang, and Kang L. Wang. “Unidirectional Propagation of Magnetostatic Surface Spin Waves at a Magnetic Film Surface.” Applied Physics Letters 105, no. 23 (December 8, 2014): 232403. © 2014 AIP Publishing LLC
Version: Final published version
ISSN
0003-6951
1077-3118