Magnetic anisotropy and phase transitions in single-crystal Tb5(Si2 2Ge1 8)

Han, M., Snyder, John Evan, Tang, W., Lograsso, T. A., Schlagel, D. and Jiles, David 2005. Magnetic anisotropy and phase transitions in single-crystal Tb5(Si2 2Ge1 8). Journal of Applied Physics 97 (10) , 10M313. 10.1063/1.1855196

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Abstract

The Tb5(SixGe4−x) alloy system has many features in common with the Gd5(SixGe4−x) system although it has a more complex magnetic and structural phase diagram. This paper reports on the magnetic anisotropy and magnetic phase transition of single-crystal Tb5(Si2.2Ge1.8) which has been investigated by the measurements of M-H and M-T along the a, b, and c axes. The variation of 1/χ vs T indicates that there is a transition from paramagnetic to ferromagnetic at Tc = 110 K. Below this transition temperature M-H curves show very strong anisotropy, and it is believed that this is due to the complex spin configuration. M-H measurements at T = 110 K show that the a axis is the easy axis, and that the saturation magnetization is 200 emu/g. The b axis is the hard axis, which needs an external magnetic field much higher than 2 T to saturate the magnetization in that direction, indicating a high magnetocrystalline anisotropy. The c axis is of intermediate hardness. The magnetic properties of this material are therefore very different from those of the related Gd5Si2Ge2 system, in which the b axis was found to be the easy axis and the magnitude of the anisotropy was smaller.

Item Type:	Article
Status:	Published
Schools:	Engineering
Uncontrolled Keywords:	terbium alloys, silicon alloys, germanium alloys, paramagnetic materials, ferromagnetic materials, magnetic anisotropy, ferromagnetic-paramagnetic transitions, magnetic hysteresis, magnetic moments, Curie temperature
Publisher:	American Institute of Physics
ISSN:	0021-8979
Last Modified:	02 May 2023 15:21
URI:	https://orca.cardiff.ac.uk/id/eprint/13626

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