Magnetovolume effect in Ho2Fe17-xMnx compounds

Authors

Jianli Wang, University of WollongongFollow
A J. Studer, Bragg Institute, ANSTO, Menai, NSW, Australia
S J. Kennedy, Bragg Institute, ANSTO, Menai, NSW, Australia
R Zeng, University of WollongongFollow
S. X. Dou, University of WollongongFollow
S J. Campbell, University of New South Wales

RIS ID

59286

Publication Details

Wang, J. L., Studer, A. J., Kennedy, S. J., Zeng, R., Dou, S. X. & Campbell, S. J. (2012). Magnetovolume effect in Ho2Fe17-xMnx compounds. Journal of Applied Physics, 111 (7), 07A911-1-07A911-3.

Abstract

The structural and magnetic properties of seven compounds in the Ho₂Fe_17-xMn_x series (x = 0-5) have been investigated. The spontaneous magnetization M_s at 10 K exhibits a minimum at x ≈ 3.8 while the 3d-sublattice magnetization M_T is found to decrease at ∼ −3.4 μ_B/per Mn atom compared with the rate of ∼−2.0 μ_B/per Mn atom expected from a simple dilution model. All of the Ho₂Fe_17-xMn_x compounds exhibit anisotropic thermal expansion below their Curie temperatures leading to the presence of strong magnetovolume effects and Invar-type behavior below T_C. An approximately zero volume thermal expansion has been detected between 10 K and 270 K for Ho₂Fe₁₇. The maximum magnetic entropy changes for Ho₂Fe_17-xMn_x with x = 0 and 2.0 are 3.2 J kg⁻¹K⁻¹ around T_C ∼ 336 K and 2.7 J kg⁻¹ K⁻¹ around T_C ∼ 302 K, respectively, for magnetic field change of B = 0-5 T.

Grant Number

ARC/DP0879070

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0879070