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Exchange spring driven spin flop transition in ErFe2/YFe2 multilayers

Exchange spring driven spin flop transition in ErFe2/YFe2 multilayers
Exchange spring driven spin flop transition in ErFe2/YFe2 multilayers
Magnetization loops for (110) ErFe2/YFe2 multilayer films grown by molecular beam epitaxy are presented and discussed. The direction of easy magnetization for the Er layers is out of plane, near a <111>-type crystal axis. For fields applied along the (110) crystal growth axis, out-of-plane magnetic exchange springs are set up in the magnetically soft YFe2 layers. For multilayer films that display negative coercivity at low temperatures, there is a crossover temperature above which the coercivity becomes positive, with additional transitions at high fields. These features are interpreted using micromagnetic modeling. At sufficiently high fields, applied perpendicular to the multilayer film plane, the energy is minimized by an exchange spring driven multilayer spin flop. In this state, the average magnetization of the ErFe2 layers switches into a nominally hard in-plane <111> axis, perpendicular to the applied field.
0003-6951
132511-[3pp]
Martin, K.N.
c53d0004-4655-40e9-aa05-563f3a9602c4
Wang, K.
2b399d1b-c3f1-4863-b78b-dd9135ef7532
Bowden, G.J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
Zhukov, A.A.
75d64070-ea67-4984-ae75-4d5798cd3c61
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Zimmermann, J.P.
b4047fb7-cba4-4777-9847-18061e78706e
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Ward, R.C.C.
b5eaa153-e136-4555-8b07-325a4b5329cb
Martin, K.N.
c53d0004-4655-40e9-aa05-563f3a9602c4
Wang, K.
2b399d1b-c3f1-4863-b78b-dd9135ef7532
Bowden, G.J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
Zhukov, A.A.
75d64070-ea67-4984-ae75-4d5798cd3c61
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Zimmermann, J.P.
b4047fb7-cba4-4777-9847-18061e78706e
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Ward, R.C.C.
b5eaa153-e136-4555-8b07-325a4b5329cb

Martin, K.N., Wang, K., Bowden, G.J., Zhukov, A.A., de Groot, P.A.J., Zimmermann, J.P., Fangohr, H. and Ward, R.C.C. (2006) Exchange spring driven spin flop transition in ErFe2/YFe2 multilayers. Applied Physics Letters, 89 (13), 132511-[3pp]. (doi:10.1063/1.2357918).

Record type: Article

Abstract

Magnetization loops for (110) ErFe2/YFe2 multilayer films grown by molecular beam epitaxy are presented and discussed. The direction of easy magnetization for the Er layers is out of plane, near a <111>-type crystal axis. For fields applied along the (110) crystal growth axis, out-of-plane magnetic exchange springs are set up in the magnetically soft YFe2 layers. For multilayer films that display negative coercivity at low temperatures, there is a crossover temperature above which the coercivity becomes positive, with additional transitions at high fields. These features are interpreted using micromagnetic modeling. At sufficiently high fields, applied perpendicular to the multilayer film plane, the energy is minimized by an exchange spring driven multilayer spin flop. In this state, the average magnetization of the ErFe2 layers switches into a nominally hard in-plane <111> axis, perpendicular to the applied field.

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Published date: 2006

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Local EPrints ID: 57455
URI: https://eprints.soton.ac.uk/id/eprint/57455
ISSN: 0003-6951
PURE UUID: 643c03fc-e86e-40a3-ad36-222affccac3d

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Date deposited: 13 Aug 2008
Last modified: 13 Mar 2019 20:34

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Contributors

Author: K.N. Martin
Author: K. Wang
Author: G.J. Bowden
Author: A.A. Zhukov
Author: P.A.J. de Groot
Author: J.P. Zimmermann
Author: H. Fangohr
Author: R.C.C. Ward

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