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Ni 59.0Mn 23.5In 17.5 Heusler alloy as the core of glass-coated microwires: magnetic properties and magnetocaloric effect

Abstract: Heusler Ni 59.0Mn 23.5In 17.5 alloy was prepared as the metallic core of a glass-coated microwire with a total diameter of 41.8 -m. X-ray diffractograms performed at room temperature and 100 K show a highly ordered L2 1 cubic structure characteristic of the austenitic phase in Heusler alloys. Thermomagnetic curves measured in the temperature range from 50 K up to 400 K show ferromagnetic coupling in the austenite with the Curie temperature around 246 K. Hysteresis loops measured at different temperatures indicate a soft ferromagnetic behaviour, confirming the microwire axis as the magnetization easy direction. The magnetic entropy variation reaches a maximum value of 1.75 J/kgK at the ferro-to-paramagnetic phase transition for a magnetic field change of 30 kOe. After short annealing, the Curie temperature is almost unchanged while the maximum entropy change increases up to 2.01 J/kgK. Refrigerant capacity and its dependence on both working temperature range and applied field value are evaluated for all microwire samples, reaching 120 J/kg for a 30 kOe magnetic field variation. We analyze the possibility of employing microwire shape Heusler alloys as low field magnetocaloric micro-devices and solid-state actuators.

 Fuente: Journal of Applied Physics, 2012, 112(3), 033905

Editorial: American Institute of Physics

 Fecha de publicación: 01/08/2012

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1063/1.4740466

ISSN: 0021-8979,1089-7550,1520-8850

Proyecto español: MAT2009-13108-C02-01 ; MAT2010-20798-C05-01

Url de la publicación: https://doi.org/10.1063/1.4740466

Autores/as

VEGA MARTÍNEZ, VÍCTOR

GARCÍA FERNÁNDEZ, JAVIER

ROSA, WAGNER DE OLIVEIRA DA

DAVID SERANTES ABALO

PRIDA PIDAL, VÍCTOR MANUEL DE LA

BADINI CONFALONIERI, GIOVANNI ANDREA

VARGA, RASTISLAV

SUÑOL MARTÍNEZ, JOAN JOSEP

HERNANDO GRANDE, BLANCA