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Title: Damping factor estimation using spin wave attenuation in permalloy film

Damping factor of a Permalloy (Py) thin film is estimated by using the magnetostatic spin wave propagation. The attenuation lengths are obtained by the dependence of the transmission intensity on the antenna distance, and decrease with increasing magnetic fields. The relationship between the attenuation length, damping factor, and external magnetic field is derived theoretically, and the damping factor was determined to be 0.0063 by fitting the magnetic field dependence of the attenuation length, using the derived equation. The obtained value is in good agreement with the general value of Py. Thus, this estimation method of the damping factor using spin waves attenuation can be useful tool for ferromagnetic thin films.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Department of Applied Physics, Fukuoka University, 8-19-1 Nanakuma, Jonan, Fukuoka 814-0180 (Japan)
  2. Department of Physics, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581 (Japan)
  3. National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047 (Japan)
Publication Date:
OSTI Identifier:
22410057
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; ATTENUATION; DAMPING; FERROMAGNETIC MATERIALS; FERROMAGNETISM; MAGNETIC FIELDS; PERMALLOY; SPIN WAVES; THIN FILMS; WAVE PROPAGATION