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The effect of inter-layer diffusion on magnetic exchange spring behaviour

The effect of inter-layer diffusion on magnetic exchange spring behaviour
The effect of inter-layer diffusion on magnetic exchange spring behaviour
The effect of inter-layer diffusion between the magnetically hard and soft layers in magnetic exchange spring systems is examined, using 1D and 2D models. It is shown that diffusion across the hard/soft interfaces leads to an increase in the bending field BB. This increase eventually saturates when the bending field BB and the coercivity BC merge. Moreover, if the increase in the bending field BB is large enough, the nature of the magnetic reversal can be affected. This behaviour is illustrated using a YFe2 dominated YFe2/DyFe2 exchange spring system. In this case the 1D model predicts that inter-layer diffusion can drive a magnetic phase change, from negative to positive coercivity. Discrete 2D model calculations of inter-layer diffusion are also presented and discussed. The latter support the predictions of the 1D model. Finally, while the emphasis is on atomic diffusion, some comments are made concerning interface roughness.
0953-8984
p.125223
Bowden, Graham J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
Martin, Kevin N.
5e478502-9b20-41e8-9fb7-62f1c3b66352
Fox, Alan
2f5a1e51-6cbe-4768-9410-5ee98eb71542
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Ward, R.C.C.
b5eaa153-e136-4555-8b07-325a4b5329cb
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Bowden, Graham J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
Martin, Kevin N.
5e478502-9b20-41e8-9fb7-62f1c3b66352
Fox, Alan
2f5a1e51-6cbe-4768-9410-5ee98eb71542
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Ward, R.C.C.
b5eaa153-e136-4555-8b07-325a4b5329cb
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d

Bowden, Graham J., Martin, Kevin N., Fox, Alan, Rainford, B.D., Ward, R.C.C. and de Groot, P.A.J. (2008) The effect of inter-layer diffusion on magnetic exchange spring behaviour. Journal of Physics: Condensed Matter, 20 (12), p.125223. (doi:10.1088/0953-8984/20/12/125223).

Record type: Article

Abstract

The effect of inter-layer diffusion between the magnetically hard and soft layers in magnetic exchange spring systems is examined, using 1D and 2D models. It is shown that diffusion across the hard/soft interfaces leads to an increase in the bending field BB. This increase eventually saturates when the bending field BB and the coercivity BC merge. Moreover, if the increase in the bending field BB is large enough, the nature of the magnetic reversal can be affected. This behaviour is illustrated using a YFe2 dominated YFe2/DyFe2 exchange spring system. In this case the 1D model predicts that inter-layer diffusion can drive a magnetic phase change, from negative to positive coercivity. Discrete 2D model calculations of inter-layer diffusion are also presented and discussed. The latter support the predictions of the 1D model. Finally, while the emphasis is on atomic diffusion, some comments are made concerning interface roughness.

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Published date: 3 March 2008
Organisations: University of Southampton

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Local EPrints ID: 143949
URI: https://eprints.soton.ac.uk/id/eprint/143949
ISSN: 0953-8984
PURE UUID: 15b1b9b0-fb16-428f-bc7c-b23a7d318a71

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Date deposited: 13 Apr 2010 15:20
Last modified: 17 Jul 2019 00:07

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