multifunctional Heusler alloys Ni43Mn37,8In12,2Co7
with an extraction magnetic calorimeter
A. V. Mashirov1,2,
A. P. Kamantsev1,2, E.
T. Dilmieva1, J. Cwik2, V. I.
I. S. Tereshina2,3, B. Hernando4,
L. Gonzalez-Legarreta4, V. Vega4, V.
V. G. Shavrov1
Institute of Radio-engineering and Electronics of RAS, Moscow, Russia
International Laboratory of High Magnetic Fields and Low Temperatures,
3Baikov Institute of
Metallurgy and Materials Science of RAS, Moscow, Russia
of Physics, University of Oviedo, Oviedo, Spain
The paper is received on December 1, 2014
Abstract. In this paper the multi-functional Heusler alloy Ni43Mn37,8In12,2Co7
is studied in the temperature region near magnetostructural phase transition by
the direct method using the extraction calorimeter method in the magnetic
fields of the Bitter coil magnet up to 14T. An attractive feature of this alloy
is that the transition from weakly magnetic metamagnetostructural martensite to
ferromagnetic austenite takes place at the temperature of 274.9 K. This makes
this alloy is very convenient model for studying the inverse MCE. The
measurements of the MCE at the initial temperature 274.9 K in an adiabatic and
quasiisothermal conditions are done. It was found that the maximum MCE in the
adiabatic regime is -2,64K in a magnetic field 6T. The maximum MCE in
isothermal mode is 2100 J/kg in a magnetic field 8T. Further increase of the
magnetic field to 14T does not improve the MCE.
Key words: magnetocaloric effect, magnetostructural phase transition, Heusler
alloys, direct measurement method, extraction magnetic calorimeter, Bitter