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Title: Large enhancement of elastic light scattering due to random fluctuations of the magnetization

Abstract

We have observed the field dependence and enhancement of the intensity of polarized elastic light scattering, from ultrathin magnetic films with perpendicular magnetic anisotropy (PMA). High-resolution Brillouin spectroscopy elucidates that this enhancement reaches its maximum at a critical field (H{sub crit}) where the magnetization starts to incline toward out-of-plane due to the strong PMA. We attribute this new effect to the microscopic instability due to random fluctuations of the magnetization near H{sub crit}, since this elastic scattering has no frequency shift from the excitation light and thus the correlation of each spin decays monotonically. The enhancement factor depends on the PMA strength as well as the film thickness, and we obtain an enhancement as large as a factor of 20 at room temperature with a low external field of 0.18 kOe. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1]
  1. Optical Sciences Center and Arizona Research Laboratories, University of Arizona, Tucson, Arizona 85721 (United States)
Publication Date:
OSTI Identifier:
20216237
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; THIN FILMS; LIGHT SCATTERING; MAGNETIZATION; FLUCTUATIONS; ELASTIC SCATTERING; ANISOTROPY; BRILLOUIN EFFECT; EXPERIMENTAL DATA

Citation Formats

Murayama, Akihiro, Hyomi, Kyoko, and Falco, Charles M. Large enhancement of elastic light scattering due to random fluctuations of the magnetization. United States: N. p., 2000. Web. doi:10.1063/1.373386.
Murayama, Akihiro, Hyomi, Kyoko, & Falco, Charles M. Large enhancement of elastic light scattering due to random fluctuations of the magnetization. United States. doi:10.1063/1.373386.
Murayama, Akihiro, Hyomi, Kyoko, and Falco, Charles M. Mon . "Large enhancement of elastic light scattering due to random fluctuations of the magnetization". United States. doi:10.1063/1.373386.
@article{osti_20216237,
title = {Large enhancement of elastic light scattering due to random fluctuations of the magnetization},
author = {Murayama, Akihiro and Hyomi, Kyoko and Falco, Charles M.},
abstractNote = {We have observed the field dependence and enhancement of the intensity of polarized elastic light scattering, from ultrathin magnetic films with perpendicular magnetic anisotropy (PMA). High-resolution Brillouin spectroscopy elucidates that this enhancement reaches its maximum at a critical field (H{sub crit}) where the magnetization starts to incline toward out-of-plane due to the strong PMA. We attribute this new effect to the microscopic instability due to random fluctuations of the magnetization near H{sub crit}, since this elastic scattering has no frequency shift from the excitation light and thus the correlation of each spin decays monotonically. The enhancement factor depends on the PMA strength as well as the film thickness, and we obtain an enhancement as large as a factor of 20 at room temperature with a low external field of 0.18 kOe. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373386},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}