Magnetovolume effects in Dy2Fe17-xMnx

Authors

Jianli Wang, University of New South WalesFollow
Stewart J. Campbell, University of New South WalesFollow
C Marquina, Universidad de Zaragoza-CSIC
M R. Ibarra, University of New South Wales

RIS ID

40270

Publication Details

Wang, J. L., Campbell, S. J., Marquina, C. and Ibarra, M. R. (2007). Magnetovolume effects in Dy2Fe17-xMnx. Journal of Magnetism and Magnetic Materials, 310 (2), 569-571.

Abstract

We have investigated the structural and magnetic properties of Dy₂Fe_17−xMn_x compounds (x=0–5.0)(x=0–5.0) by X-ray diffraction, linear thermal expansion (LTE) and magnetization measurements. Compared with Dy₂Co_17−xMn_x compounds for which a linear increase of the unit cell volume with increasing Mn fraction is found, the composition dependence of the unit cell volume in the Dy₂Fe_17−xMn_x series exhibits a relative maximum around x∼0.5 before increasing monotonically for x⩾2; this behaviour can be ascribed to the existence of spontaneous volume magnetostriction as confirmed by LTE measurements. The Curie temperature (T_c) remains essentially constant (around 370 K) for Mn content up to x=1x=1 before decreasing steadily with increasing x, down to T_C=232 K for Dy₂Fe₁₂Mn₅. The 3d-sublattice magnetization decreases monotonically with increasing Mn content.