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

Journal Article · Mon Dec 08 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4903742· OSTI ID:22395478

Wong, Kin L.; Bao, Mingqiang; Lin, Yen-Ting; Wang, Kang L. ^[1]; Bi, Lei ^[2]; Wen, Qiye; Zhang, Huaiwu ^[3]; Chatelon, Jean Pierre ^[4]

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1. Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, California 90095 (United States)
2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
3. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China)
4. Univerisité de Saint-Etienne, Université de Lyon, LT2C, 25 rue du Docteur Rémy Annino, 42000 Saint-Etienne (France)

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{sup →}×n{sup →}, where n{sup →} 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.

• OSTI ID: 22395478
• Journal Information: Applied Physics Letters, Vol. 105, Issue 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
FERRITE GARNETS
FILMS
MAGNETIC FIELDS
PERMALLOY
SPIN WAVES
SURFACES
THICKNESS
WAVE PROPAGATION
YTTRIUM COMPOUNDS