Phase diagram, ferromagnetic martensitic transformation and magnetoresponsive properties of Fe-doped MnCoGe alloys

TL;DR

This study explores Fe-doped MnCoGe alloys, revealing a magnetostructural transition that enables magnetic-field-induced transformations and significant magnetic-entropy changes, with a detailed phase diagram.

Contribution

It introduces a comprehensive phase diagram for Fe-doped MnCoGe alloys and demonstrates their magnetoresponsive properties and magnetostructural transition.

Findings

Magnetostructural transition from paramagnetic austenite to ferromagnetic martensite.

Large magnetization difference enabling magnetic-field-induced transformations.

Significant magnetic-entropy changes observed in the alloys.

Abstract

The crystal structure and magnetoresponsive properties of Fe-doped MnCoGe alloys have been investigated using x-ray diffraction (XRD) and magnetic measurements. By alloying the Fe-containing isostructure compounds into MnCoGe, a magnetostructural transition from paramagnetic austenite to ferromagnetic martensite with large magnetization difference can be realized in a temperature window between the Curie temperatures of the austenite and martensite, resulting in magnetic-field-induced martensitic transformations and large magnetic-entropy changes. A structural and magnetic phase diagram of Fe-doped MnCoGe alloys has been proposed.