Magnetovolume Effects in Heusler Compounds via First-Principles Calculations

authors	Goncalves, JN; Amaral, JS; Amaral, VS
nationality	International
journal	IEEE TRANSACTIONS ON MAGNETICS
author keywords	Curie temperature; density functional theory; exchange interactions; Heusler; magnetovolume effect
keywords	EXCHANGE INTERACTIONS; CURIE-TEMPERATURE; ALLOYS; DISORDER; SN
abstract	Heusler alloys are promising for several applications, including magnetic refrigeration, due to high magnetocaloric and magnetovolume effects. One way to optimize this potential is by increasing the magnetovolume effect. Using density functional theory with the Korringa-Kohn-Rostoker method, we calculate the effective exchange interaction energies and corresponding mean field Curie temperature as a function of the volume (hydrostatic pressure) in several L2(1)-type Co(2)YZ Heusler alloys. Different qualitative trends and signs of the pressure derivatives of the Curie temperature and moments are found among these compounds, discussed and compared with previous calculations and experiments.
publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
issn	0018-9464
year published	2014
volume	50
issue	11
digital object identifier (doi)	10.1109/TMAG.2014.2326892
web of science category	Engineering, Electrical & Electronic; Physics, Applied
subject category	Engineering; Physics
unique article identifier	WOS:000349465900019