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Room temperature coercivities of Tb1-xDyxFe2 (110) molecular beam epitaxy grown films

Room temperature coercivities of Tb1-xDyxFe2 (110) molecular beam epitaxy grown films
Room temperature coercivities of Tb1-xDyxFe2 (110) molecular beam epitaxy grown films
It has been known for many years that the rare-earth intermetallic compound terfenol (Tb0.3Dy0.7)Fe2 is characterized by "giant magnetostriction," which has found practical applications. In this article we report the magnetic properties of a series of molecular beam epitaxially (MBE) grown (110) Tb1–xDyxFe2 alloy films, on sapphire substrates. All the measurements were performed at room temperature with the field applied along an in-plane [1-bar 10] axis. However, unlike bulk Tb1–xDyxFe2, it is shown that the coercivity does not fall to zero at the magic ratio of x~0.7. Instead, the coercivities fall almost on a straight line, with the maximum coercivity for pure TbFe2 (0.64 T) and the smallest for DyFe2 (0.22 T). The difference between the bulk and MBE films is attributed to the presence of a magnetoelastic strain term, induced during crystal growth by the sapphire substrate. In practice, the measured coercivities can be described, approximately, with a modified Stoner–Wohlfarth model.
0021-8979
8639-8640
Beaujour, J-M.L.
5cb1e799-4872-4fe1-b240-58e0a4d92c8e
Bowden, G.J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
Zhukov, A.A.
75d64070-ea67-4984-ae75-4d5798cd3c61
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Ward, R.C.C.
b5eaa153-e136-4555-8b07-325a4b5329cb
Wells, M.R.
eb14a225-4803-4e6c-87b6-c1d1e5b8483d
Beaujour, J-M.L.
5cb1e799-4872-4fe1-b240-58e0a4d92c8e
Bowden, G.J.
f73a1c01-4d38-4170-bf30-9ebfa4283807
Zhukov, A.A.
75d64070-ea67-4984-ae75-4d5798cd3c61
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Ward, R.C.C.
b5eaa153-e136-4555-8b07-325a4b5329cb
Wells, M.R.
eb14a225-4803-4e6c-87b6-c1d1e5b8483d

Beaujour, J-M.L., Bowden, G.J., Zhukov, A.A., Rainford, B.D., de Groot, P.A.J., Ward, R.C.C. and Wells, M.R. (2003) Room temperature coercivities of Tb1-xDyxFe2 (110) molecular beam epitaxy grown films. Journal of Applied Physics, 93 (10), 8639-8640. (doi:10.1063/1.1540251).

Record type: Article

Abstract

It has been known for many years that the rare-earth intermetallic compound terfenol (Tb0.3Dy0.7)Fe2 is characterized by "giant magnetostriction," which has found practical applications. In this article we report the magnetic properties of a series of molecular beam epitaxially (MBE) grown (110) Tb1–xDyxFe2 alloy films, on sapphire substrates. All the measurements were performed at room temperature with the field applied along an in-plane [1-bar 10] axis. However, unlike bulk Tb1–xDyxFe2, it is shown that the coercivity does not fall to zero at the magic ratio of x~0.7. Instead, the coercivities fall almost on a straight line, with the maximum coercivity for pure TbFe2 (0.64 T) and the smallest for DyFe2 (0.22 T). The difference between the bulk and MBE films is attributed to the presence of a magnetoelastic strain term, induced during crystal growth by the sapphire substrate. In practice, the measured coercivities can be described, approximately, with a modified Stoner–Wohlfarth model.

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Published date: 2003

Identifiers

Local EPrints ID: 57063
URI: https://eprints.soton.ac.uk/id/eprint/57063
ISSN: 0021-8979
PURE UUID: 5517cedb-ab39-48b1-b771-a73ec2ddbf7d

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

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Contributors

Author: J-M.L. Beaujour
Author: G.J. Bowden
Author: A.A. Zhukov
Author: B.D. Rainford
Author: P.A.J. de Groot
Author: R.C.C. Ward
Author: M.R. Wells

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