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Title: Spring magnet films

Abstract

The properties of exchange-spring-coupled bilayer and superlattice films are highlighted for Sm-Co hard magnet (nominally Sm{sub 2}Co{sub 7}) and Fe or Co soft magnet layers. The hexagonal Sm-Co is grown via magnetron sputtering in a- and b-axis epitaxial orientations. In both cases the c-axis, in the film plane, is the easy axis of magnetization. Trends in coercivity with film thickness are established and related to the respective microstructures of the two orientations. The magnetization reversal process for the bilayers is examined by magnetometry and magneto-optical imaging, as well as by simulations that utilize a one-dimensional model to provide the spin configuration for each atomic layer. The Fe magnetization is pinned to that of the Sm-Co at the interface, and reversal proceeds via a progressive twisting of the Fe magnetization. The Fe demagnetization curves are reversible as expected for a spring magnet. Comparison of experiment and simulations indicates that the spring magnet behavior can be understood from the intrinsic properties of the hard and soft layers. Estimates are made of the ultimate gain in performance that can potentially be realized in this system.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20000747
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0018-9464
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PERMANENT MAGNETS; SUPERLATTICES; SAMARIUM ALLOYS; COBALT BASE ALLOYS; COERCIVE FORCE; MICROSTRUCTURE; MAGNETIZATION; IRON; LAYERS; COBALT

Citation Formats

Jiang, J.S., Fullerton, E.E., Sowers, C.H., Inomata, A., Bader, S.D., Shapiro, A.J., Shull, R.D., Gornakov, V.S., and Nikitenko, V.I. Spring magnet films. United States: N. p., 1999. Web. doi:10.1109/20.800484.
Jiang, J.S., Fullerton, E.E., Sowers, C.H., Inomata, A., Bader, S.D., Shapiro, A.J., Shull, R.D., Gornakov, V.S., & Nikitenko, V.I. Spring magnet films. United States. doi:10.1109/20.800484.
Jiang, J.S., Fullerton, E.E., Sowers, C.H., Inomata, A., Bader, S.D., Shapiro, A.J., Shull, R.D., Gornakov, V.S., and Nikitenko, V.I. Wed . "Spring magnet films". United States. doi:10.1109/20.800484.
@article{osti_20000747,
title = {Spring magnet films},
author = {Jiang, J.S. and Fullerton, E.E. and Sowers, C.H. and Inomata, A. and Bader, S.D. and Shapiro, A.J. and Shull, R.D. and Gornakov, V.S. and Nikitenko, V.I.},
abstractNote = {The properties of exchange-spring-coupled bilayer and superlattice films are highlighted for Sm-Co hard magnet (nominally Sm{sub 2}Co{sub 7}) and Fe or Co soft magnet layers. The hexagonal Sm-Co is grown via magnetron sputtering in a- and b-axis epitaxial orientations. In both cases the c-axis, in the film plane, is the easy axis of magnetization. Trends in coercivity with film thickness are established and related to the respective microstructures of the two orientations. The magnetization reversal process for the bilayers is examined by magnetometry and magneto-optical imaging, as well as by simulations that utilize a one-dimensional model to provide the spin configuration for each atomic layer. The Fe magnetization is pinned to that of the Sm-Co at the interface, and reversal proceeds via a progressive twisting of the Fe magnetization. The Fe demagnetization curves are reversible as expected for a spring magnet. Comparison of experiment and simulations indicates that the spring magnet behavior can be understood from the intrinsic properties of the hard and soft layers. Estimates are made of the ultimate gain in performance that can potentially be realized in this system.},
doi = {10.1109/20.800484},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)},
issn = {0018-9464},
number = 5Pt2,
volume = 35,
place = {United States},
year = {1999},
month = {9}
}