Investigation of the inverse magnetocaloric effect with the fraction method

S Yuce; E Kavak; O Yildirim; N M Bruno; B Emre

doi:10.1088/1361-648X/acd3ce

Investigation of the inverse magnetocaloric effect with the fraction method

J Phys Condens Matter. 2023 May 30;35(34). doi: 10.1088/1361-648X/acd3ce.

Authors

S Yuce¹, E Kavak², O Yildirim³, N M Bruno⁴, B Emre²

Affiliations

¹ Department of Physics, Science and Literature Faculty, Ondokuz Mayis University, Kurupelit 55139, Samsun, Turkey.
² Department of Engineering Physics, Faculty of Engineering, Ankara University, Ankara 06100, Turkey.
³ Empa-Swiss Federal Laboratories for Material Science and Technology, CH 8600 Dübendorf, Switzerland.
⁴ Department of Mechanical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, United States of America.

PMID: 37160131
DOI: 10.1088/1361-648X/acd3ce

Abstract

In this study, we examine Ni₄₉Nb₁Mn₃₆In₁₄(nom. at.%) magnetic shape memory alloy (MSMA) to illustrate the inverse magnetocaloric effect (MCE) using the fraction method. The magnetic entropy change,ΔSmag, was calculated with both, the fraction method and the thermomagnetic Maxwell relation. Our results demonstrate that there exists a large magnetization difference between field-cooling and field-heating histories in Ni₄₉Nb₁Mn₃₆In₁₄(nom. at.%) MSMA, which can be attributed to the pinning of lattice entropy and magnetic entropy, as it is well-known that the temperature and applied magnetic fields have an opposing effect on the total entropy change. In addition, we describe the inverse MCE and the contradictory roles on the total entropy change between the two stimuli via the fraction method.

Keywords: Heusler alloys; inverse magnetocaloric effect; magnetic shape memory alloys; magnetocaloric effect; martensitic transformation.

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