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Title: Micromagnetic study of CoPt-SiO{sub 2} granular films by spin-wave Brillouin scattering

Abstract

A spin-wave Brillouin scattering study of a CoPt-SiO{sub 2} granular magnetic recording medium was made. This film contains ferromagnetic CoPt particles in a SiO{sub 2} matrix, and has an extremely low medium noise property due to little exchange coupling between magnetic grains. Spin waves of both the propagating surface mode and standing wave mode were found to be excited in granular magnetic films with various microstructures. A possible origin of the spin wave is a magnetostatic coupling between regularly ordered CoPt grains, as reported for artificially patterned magnetic thin films. This result shows two promising features of the CoPt-SiO{sub 2} granular film for high density recording medium: It is an ordered media obtained in a self-organizing manner, and it is less influenced by the thermal fluctuation effect, which is a serious problem for current high density magnetic recording. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [2];  [2]
  1. Corporate R and D Center, Toshiba Corporation, Kawasaki, Kanagawa 210-8582, (Japan)
  2. Optical Sciences Center, The University of Arizona, Tucson, Arizona 85721 (United States)
Publication Date:
OSTI Identifier:
20216289
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT ALLOYS; PLATINUM ALLOYS; MATRIX MATERIALS; SILICON OXIDES; THIN FILMS; SPIN WAVES; BRILLOUIN EFFECT; RECORDING SYSTEMS; MEMORY DEVICES; MAGNETIC MATERIALS; GRANULAR MATERIALS; EXPERIMENTAL DATA

Citation Formats

Kikitsu, A., Murayama, A., Hyomi, K., and Falco, C. M. Micromagnetic study of CoPt-SiO{sub 2} granular films by spin-wave Brillouin scattering. United States: N. p., 2000. Web. doi:10.1063/1.372894.
Kikitsu, A., Murayama, A., Hyomi, K., & Falco, C. M. Micromagnetic study of CoPt-SiO{sub 2} granular films by spin-wave Brillouin scattering. United States. doi:10.1063/1.372894.
Kikitsu, A., Murayama, A., Hyomi, K., and Falco, C. M. Mon . "Micromagnetic study of CoPt-SiO{sub 2} granular films by spin-wave Brillouin scattering". United States. doi:10.1063/1.372894.
@article{osti_20216289,
title = {Micromagnetic study of CoPt-SiO{sub 2} granular films by spin-wave Brillouin scattering},
author = {Kikitsu, A. and Murayama, A. and Hyomi, K. and Falco, C. M.},
abstractNote = {A spin-wave Brillouin scattering study of a CoPt-SiO{sub 2} granular magnetic recording medium was made. This film contains ferromagnetic CoPt particles in a SiO{sub 2} matrix, and has an extremely low medium noise property due to little exchange coupling between magnetic grains. Spin waves of both the propagating surface mode and standing wave mode were found to be excited in granular magnetic films with various microstructures. A possible origin of the spin wave is a magnetostatic coupling between regularly ordered CoPt grains, as reported for artificially patterned magnetic thin films. This result shows two promising features of the CoPt-SiO{sub 2} granular film for high density recording medium: It is an ordered media obtained in a self-organizing manner, and it is less influenced by the thermal fluctuation effect, which is a serious problem for current high density magnetic recording. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372894},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}