Influence of the Magnetic Anisotropy on the Magnetic Entropy Change of Ni2Mn(Ga, Bi) Memory Shape Alloy
authors Leitao, JCV; Rocco, DL; Amaral, JS; Reis, MD; Amaral, VBS; Fernandes, RP; Martins, NV; Tavares, PB
nationality International
journal IEEE TRANSACTIONS ON MAGNETICS
author keywords Heusler alloy; magnetocaloric effect; memory shape; Ni2MnGa
keywords PHASE-TRANSITIONS; TEMPERATURES; ABSOLUTE
abstract The magnetocaloric effect (MCE) is a good chance to create a more efficient refrigeration technique, both in energy and environmental friendliness. On the search for materials with large MCE (mainly characterized by a great magnetic entropy variation) in a wide temperature range around room temperature, this work focuses on the widely studied Hensler alloy and the influence of bismuth alloying in the stoichiometry Ni2MnGa in an attempt to make the magnetic and structural transition temperatures, T-C and T-M, come closer, and therefore create a large MCE. In addition, we discuss the influence of alloying processes on the magnetic anisotropy. Our results have in fact increased T-M and decreased T-C, but Bi substitution in Ga site (from 0 up to 5%) has been insufficient to merge those two transitions. The maximum magnetic entropy change was found to be 3.8 J/kg.K for the pure sample (without Bi) and 2.2 J/kg.K for sample 4 (maximum Bi concentration).
publisher IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
issn 0018-9464
year published 2008
volume 44
issue 11
beginning page 3036
ending page 3039
digital object identifier (doi) 10.1109/TMAG.2008.2002794
web of science category Engineering, Electrical & Electronic; Physics, Applied
subject category Engineering; Physics
unique article identifier WOS:000262221200151
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journal analysis (jcr 2019):
journal impact factor 1.626
5 year journal impact factor 1.489
category normalized journal impact factor percentile 36.022
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