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Phys. Rev. B 75, 104432 (2007) [6 pages]

Role of diffused Co atoms in improving effective exchange coupling in Sm-Co∕Fe spring magnets

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Y. Choi1,2, J. S. Jiang1, Y. Ding3, R. A. Rosenberg4, J. E. Pearson1, S. D. Bader1, A. Zambano5, M. Murakami5, I. Takeuchi5, Z. L. Wang3, and J. P. Liu2
1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
2Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, USA
3School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
4Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
5Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

Received 6 November 2006; revised 25 January 2007; published 30 March 2007

In Sm-Co∕Fe exchange-spring magnet films, the magnetization reversal processes of constituent elements and layers were studied with an emphasis on the role of diffused Co atoms. Enhanced coupling effectiveness was observed in a film with a graded interface where significant Co diffusion into the Fe layer was observed by means of electron microscopy. Comprehensive insight into the magnetization reversal processes was obtained by combining micromagnetic simulation with element- and depth-resolved x-ray resonant magnetic scattering. The approach unambiguously identifies distinctive composition profiles across the graded interface and provides the magnetization behavior of the diffused Co.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.104432
DOI:
10.1103/PhysRevB.75.104432
PACS:
75.50.Ww, 75.60.Jk, 75.25.+z, 68.55.Jk
 
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