Table of Contents
Physics Research International
Volume 2012, Article ID 794171, 5 pages
http://dx.doi.org/10.1155/2012/794171
Research Article

Tailoring of Magnetocaloric Effect in Metamagnetic Shape Memory Alloy

1Departamento de Física, Universidad de Oviedo, Calvo Sotelo s/n, 33007 Oviedo, Spain
2Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150, Urca, 22290-180 Rio de Janeiro RJ, Brazil
3Girona University, Campus Montilivi, ed. PII, Lluís Santaló s/n, 17003 Girona, Spain

Received 2 August 2011; Revised 7 November 2011; Accepted 7 November 2011

Academic Editor: Manh-Huong Phan

Copyright © 2012 W. O. Rosa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate the direct and inverse magnetocaloric effect in Ni45.5Mn43.0In11.5 Heusler alloy ribbons comparing the results obtained for the as-quenched sample with the ones after different annealing procedures. An enhancement and shift of the entropy maximum to near room temperature is observed in all annealed samples. A remarkable magnetocaloric effect is observed in samples with short-time treatment (10 minutes) and at the lowest annealing temperature. We show that the suppressing of uncompensated martensitic transition and thermal hysteresis are both influenced by the heat treatment. Also, an improvement on Curie’s temperature is observed and, at low magnetic field, it has been risen up to 310 K. Our results demonstrate that the martensitic transformation is highly sensitive to the applied magnetic field and also to the annealing treatment, which means that the magnetocaloric effect can be tuned showing different behaviors for each sample.