Engineering coercivity in YFe2 dominated DyFe2/YFe2 superlattice by patterning

Wang, K., Martin, K.N., Morrison, C.G., Ward, R.C.C., Bowden, G.J. and de Groot, P.A.J. (2007) Engineering coercivity in YFe2 dominated DyFe2/YFe2 superlattice by patterning. Applied Physics A: Materials Science & Processing, 86 (3), 325-328. (doi:10.1007/s00339-006-3791-x).

Abstract

Single crystal 400 nm thick Laves phase [20 Å DyFe2/80 Å YFe2]40 superlattice have been grown by MBE with a (110) growth direction. VSM measurements performed at room temperature with an applied field range of ±1.2×10⁵ Oe, directed along the [001] direction, reveal a unique single-phase-liked ferrimagnetic behavior. A dominant exchange spring behavior is revealed by MOKE measurement along the [–110] direction. Furthermore, for striped arrays patterned along the [001] direction with height-to-width ratio of 0.05, a shape anisotropy of the order of 10⁴ erg/cm³ is induced, resulting into a pronounced change of coercivity due to the comparable magnitude with intrinsic anisotropies. The results demonstrate the feasibility of engineering both single-phase-liked and exchange-spring magnet behavior in Laves phase epitaxial hard/soft superlattices by patterning.

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