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Title: Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers

Abstract

Exchange bias of a partially oxidized thin film of ferromagnetic Co was studied by magnetization measurements and polarized neutron reflectivity (PNR). The magnetization curve shows strong effects of training with cycling of the magnetic field. Reflectivity measurements with the field parallel to the cooling field showed the onset of spin-dependent diffuse scattering--off the specular reflection--after a training cycle. Such scattering, of the Yoneda type, is due to misaligned Co domains possibly close to the Co/CoO interface. Subjecting the field cooled Co/CoO pair to a field perpendicular to the cooling field causes a rotation of the magnetization. The PNR measurements confirmed earlier susceptibility studies by indicating that the rotation of the magnetization is reversible in fields up to 400 Oe. The rotation of the magnetization of Co is uniform across the film thickness. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. Argonne National Laboratory, Materials Science Division, Bldg. 223, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
  2. University of Minnesota, Department of Physics, 116 Church Street SE, Minneapolis, Minnesota 55455 (United States)
Publication Date:
OSTI Identifier:
20216221
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; COBALT OXIDES; EXCHANGE INTERACTIONS; THIN FILMS; FERROMAGNETIC MATERIALS; LAYERS; MAGNETIZATION; NEUTRON DIFFRACTION; EXPERIMENTAL DATA

Citation Formats

Velthuis, S. G. E. te, Berger, A., Felcher, G. P., Hill, B. K., and Dahlberg, E. Dan. Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers. United States: N. p., 2000. Web. doi:10.1063/1.373243.
Velthuis, S. G. E. te, Berger, A., Felcher, G. P., Hill, B. K., & Dahlberg, E. Dan. Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers. United States. doi:10.1063/1.373243.
Velthuis, S. G. E. te, Berger, A., Felcher, G. P., Hill, B. K., and Dahlberg, E. Dan. Mon . "Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers". United States. doi:10.1063/1.373243.
@article{osti_20216221,
title = {Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers},
author = {Velthuis, S. G. E. te and Berger, A. and Felcher, G. P. and Hill, B. K. and Dahlberg, E. Dan},
abstractNote = {Exchange bias of a partially oxidized thin film of ferromagnetic Co was studied by magnetization measurements and polarized neutron reflectivity (PNR). The magnetization curve shows strong effects of training with cycling of the magnetic field. Reflectivity measurements with the field parallel to the cooling field showed the onset of spin-dependent diffuse scattering--off the specular reflection--after a training cycle. Such scattering, of the Yoneda type, is due to misaligned Co domains possibly close to the Co/CoO interface. Subjecting the field cooled Co/CoO pair to a field perpendicular to the cooling field causes a rotation of the magnetization. The PNR measurements confirmed earlier susceptibility studies by indicating that the rotation of the magnetization is reversible in fields up to 400 Oe. The rotation of the magnetization of Co is uniform across the film thickness. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373243},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}