Magnetic anisotropy induced by patterning in (110) MBE-grown ternary Laves phase TbDyFe2 films

Wang, K., Martin, K.N., Morrison, C., Ward, R.C.C., Bowden, G.J. and de Groot, P.A.J. (2008) Magnetic anisotropy induced by patterning in (110) MBE-grown ternary Laves phase TbDyFe2 films. Journal of Alloys and Compounds, 455 (1-2), 31-34. (doi:10.1016/j.jallcom.2007.01.077).

Abstract

Ternary rare-earth intermetallic Laves phase compounds Tb0.1Dy0.9Fe2, grown by MBE, were characterized by a vibrating sample magnetometer (VSM) and magneto-optical Kerr effect magnetometry (MOKE). Striped arrays with 5 μm-width along an in-plane easy-axis [-1,1,0] direction were defined by a UV direct write system in 400 nm-thick (1 1 0) epitaxial Tb0.1Dy0.9Fe2 films. An additional shape anisotropy of 2.7 × 10⁵ erg/cm³ in magnitude is induced. MOKE measurements reveal pronounced enhancement of the switching field along [-1,1,0] direction. However, the switching field along the hard-axis [0 0 1] direction is unchanged as the intrinsic anisotropy along the [0 0 1] direction is an order of magnitude larger than the induced one. The results demonstrate a possibility of engineering the magnetostriction-to-anisotropy ratio by patterning in epitaxial TbDyFe2 magnetostrictive materials.

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