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Magnetic anisotropy terms in [110] MBE grown REFe2 films involving the strain term ???

Magnetic anisotropy terms in [110] MBE grown REFe2 films involving the strain term ???
Magnetic anisotropy terms in [110] MBE grown REFe2 films involving the strain term ???
The magnetic anisotropy parameters in [110] MBE grown films of REFe2 compounds are not the same as those in the bulk. This is due to the presence of a shear strain εxy, frozen in during crystal growth. In this paper, calculated magnetic anisotropy parameters for [110] MBE grown REFe2 films, that directly involve the shear strain εxy, are presented and discussed. In addition to the usual first order Callen and Callen term K˜'2, there are nine second order terms six of which involve cross terms between εxy and the cubic crystal field terms B4 and B6. Two of the second order cross terms are identified as being important: K˜"242(T) and K˜"262(T). Of these, the rank-two term K˜"242(T) dominates over a large temperature range. It has the same angular dependence as the first order term K˜'2, but with a more rapid temperature dependence. The correction at T = 0K for TbFe2, DyFe2, HoFe2, ErFe2, and TmFe2, amounts to ~+9.2%, -13.9%, -11.6%, +22.7%, and 27.1%, respectively. Similar comments are made concerning the rank-four K˜"264(T) term.
0953-8984
5861-5871
Bowden, G.J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Wang, K.
2b399d1b-c3f1-4863-b78b-dd9135ef7532
Martin, K.N.
c53d0004-4655-40e9-aa05-563f3a9602c4
Zimmermann, J.P.
b4047fb7-cba4-4777-9847-18061e78706e
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Bowden, G.J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Wang, K.
2b399d1b-c3f1-4863-b78b-dd9135ef7532
Martin, K.N.
c53d0004-4655-40e9-aa05-563f3a9602c4
Zimmermann, J.P.
b4047fb7-cba4-4777-9847-18061e78706e
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160

Bowden, G.J., de Groot, P.A.J., Rainford, B.D., Wang, K., Martin, K.N., Zimmermann, J.P. and Fangohr, H. (2006) Magnetic anisotropy terms in [110] MBE grown REFe2 films involving the strain term ??? Journal of Physics: Condensed Matter, 18, 5861-5871. (doi:10.1088/0953-8984/18/26/006).

Record type: Article

Abstract

The magnetic anisotropy parameters in [110] MBE grown films of REFe2 compounds are not the same as those in the bulk. This is due to the presence of a shear strain εxy, frozen in during crystal growth. In this paper, calculated magnetic anisotropy parameters for [110] MBE grown REFe2 films, that directly involve the shear strain εxy, are presented and discussed. In addition to the usual first order Callen and Callen term K˜'2, there are nine second order terms six of which involve cross terms between εxy and the cubic crystal field terms B4 and B6. Two of the second order cross terms are identified as being important: K˜"242(T) and K˜"262(T). Of these, the rank-two term K˜"242(T) dominates over a large temperature range. It has the same angular dependence as the first order term K˜'2, but with a more rapid temperature dependence. The correction at T = 0K for TbFe2, DyFe2, HoFe2, ErFe2, and TmFe2, amounts to ~+9.2%, -13.9%, -11.6%, +22.7%, and 27.1%, respectively. Similar comments are made concerning the rank-four K˜"264(T) term.

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Published date: 2006

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Local EPrints ID: 37837
URI: https://eprints.soton.ac.uk/id/eprint/37837
ISSN: 0953-8984
PURE UUID: 81cfb437-8f1d-4579-8008-b773c88de532

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Date deposited: 01 Nov 2006
Last modified: 24 Aug 2017 16:31

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