Windows open for highly tunable magnetostructural phase transitions

TL;DR

This study demonstrates how isostructural alloying in Mn-Co-Ni-Ge-Si compounds can create wide, tunable magnetostructural phase transition temperature windows, enabling multifunctional magnetic and caloric effects over broad temperature ranges.

Contribution

It introduces a method to tailor magnetostructural transitions over wide temperature ranges using isostructural alloying in specific alloy systems.

Findings

Established Curie-temperature windows up to 377 K wide.

Achieved magnetic-field-induced metamagnetic behavior.

Observed giant magnetocaloric effects across the temperature range.

Abstract

An attempt was made to tailor the magnetostructural transitions (MSTs) over a wide temperature range under the principle of isostructural alloying. A series of wide Curie-temperature windows (CTWs) with a maximal width of 377 K between 69 and 446 K were established in the Mn1-yCoyNiGe1-xSix system. Throughout the CTWs, the magnetic-field-induced metamagnetic behavior and giant magnetocaloric effects are obtained. The (Mn,Co)Ni(Ge,Si) system shows great potential as multifunctional phase-transition materials that work in a wide range covering liquid-nitrogen and above water-boiling temperatures. Moreover, general understanding to isostructural alloying and CTWs constructed in (Mn,Co)Ni(Ge,Si) as well as (Mn,Fe)Ni(Ge,Si) are provided.