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

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.
Authors:
; ; ;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5] ;  [2]
  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. (China)
  4. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China)
  5. Univerisité de Saint-Etienne, Université de Lyon, LT2C, 25 rue du Docteur Rémy Annino, 42000 Saint-Etienne (France)
Publication Date:
OSTI Identifier:
22395478
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; FERRITE GARNETS; FILMS; MAGNETIC FIELDS; PERMALLOY; SPIN WAVES; SURFACES; THICKNESS; WAVE PROPAGATION; YTTRIUM COMPOUNDS