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

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).

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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