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Title: Anisotropy determination in epitaxial Sm-Co/Fe exchange springs

Abstract

We report in-plane anisotropy in epitaxial Sm-Co(x)/Fe(y) bilayers as determined by ferromagnetic resonance (FMR). Four samples, (x,y)=(35,30) and (20, 20) nm each on MgO (110) and (100) substrates, have been prepared via magnetron sputtering. The two substrate orientations result in twofold and fourfold Sm-Co symmetry respectively, with the Sm-Co c-axis in-plane. Magnetization curves indicate elastic exchange spring Fe behavior in reversing fields up to the Sm-Co switching fields (6 and 8 kG at room temperature in the (35, 30) and (20, 20) nm films, respectively). 35 GHz in-plane FMR measurements were made in order to map the crystalline anisotropy of the Fe layer as well as the induced anisotropy from the exchange coupling to the Sm-Co layer. The twofold Sm-Co samples exhibit a clear superposition of the near fourfold Fe crystal field anisotropy (530 Oe) and the unidirectional exchange-bias anisotropy ({approx_equal}650 Oe) arising from the Fe/Sm-Co interface. The crystalline Fe anisotropy in the fourfold Sm-Co samples is less well defined, presumably due to poorer epitaxy of the Fe layer for this orientation. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2]
  1. Department of Physics, Miami University, Oxford, Ohio 45056 (United States)
  2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
20216276
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; SAMARIUM; COBALT; IRON; ANISOTROPY; LAYERS; FERROMAGNETIC RESONANCE; SPUTTERING; MAGNETIZATION; EXCHANGE INTERACTIONS; EXPERIMENTAL DATA

Citation Formats

Pechan, Michael J., Teng, Nienchtze, Stewart, Jason-Dennis, Hilt, J. Zachary, Fullerton, Eric E., Jiang, J. S., Sowers, C. H., and Bader, S. D. Anisotropy determination in epitaxial Sm-Co/Fe exchange springs. United States: N. p., 2000. Web. doi:10.1063/1.372808.
Pechan, Michael J., Teng, Nienchtze, Stewart, Jason-Dennis, Hilt, J. Zachary, Fullerton, Eric E., Jiang, J. S., Sowers, C. H., & Bader, S. D. Anisotropy determination in epitaxial Sm-Co/Fe exchange springs. United States. doi:10.1063/1.372808.
Pechan, Michael J., Teng, Nienchtze, Stewart, Jason-Dennis, Hilt, J. Zachary, Fullerton, Eric E., Jiang, J. S., Sowers, C. H., and Bader, S. D. Mon . "Anisotropy determination in epitaxial Sm-Co/Fe exchange springs". United States. doi:10.1063/1.372808.
@article{osti_20216276,
title = {Anisotropy determination in epitaxial Sm-Co/Fe exchange springs},
author = {Pechan, Michael J. and Teng, Nienchtze and Stewart, Jason-Dennis and Hilt, J. Zachary and Fullerton, Eric E. and Jiang, J. S. and Sowers, C. H. and Bader, S. D.},
abstractNote = {We report in-plane anisotropy in epitaxial Sm-Co(x)/Fe(y) bilayers as determined by ferromagnetic resonance (FMR). Four samples, (x,y)=(35,30) and (20, 20) nm each on MgO (110) and (100) substrates, have been prepared via magnetron sputtering. The two substrate orientations result in twofold and fourfold Sm-Co symmetry respectively, with the Sm-Co c-axis in-plane. Magnetization curves indicate elastic exchange spring Fe behavior in reversing fields up to the Sm-Co switching fields (6 and 8 kG at room temperature in the (35, 30) and (20, 20) nm films, respectively). 35 GHz in-plane FMR measurements were made in order to map the crystalline anisotropy of the Fe layer as well as the induced anisotropy from the exchange coupling to the Sm-Co layer. The twofold Sm-Co samples exhibit a clear superposition of the near fourfold Fe crystal field anisotropy (530 Oe) and the unidirectional exchange-bias anisotropy ({approx_equal}650 Oe) arising from the Fe/Sm-Co interface. The crystalline Fe anisotropy in the fourfold Sm-Co samples is less well defined, presumably due to poorer epitaxy of the Fe layer for this orientation. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372808},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}