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

Kin L. Wong; Lei Bi; Mingqiang Bao; Qiye Wen; Jean Pierre Chatelon; Yen Ting Lin; C. A. Ross; Huaiwu Zhang; Kang L. Wang

doi:10.1063/1.4903742

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

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

College of Electrical Engineering and Computer Science

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

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 -H X n, where n is the surface normal. This unidirectional propagation property is confirmed by experiments with both permalloy and iron garnet films of different film thicknesses, and has implications in the design of spin-wave devices such as isolators and spin-wave diodes.

Original language	English
Article number	232403
Journal	Applied Physics Letters
Volume	105
Issue number	23
DOIs	https://doi.org/10.1063/1.4903742
Publication status	Published - 2014 Dec 8

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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AU - Wong, Kin L.

AU - Bi, Lei

AU - Bao, Mingqiang

AU - Wen, Qiye

AU - Chatelon, Jean Pierre

AU - Lin, Yen Ting

AU - Ross, C. A.

AU - Zhang, Huaiwu

AU - Wang, Kang L.

PY - 2014/12/8

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AB - 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 -H X n, where n is the surface normal. This unidirectional propagation property is confirmed by experiments with both permalloy and iron garnet films of different film thicknesses, and has implications in the design of spin-wave devices such as isolators and spin-wave diodes.

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