Giant diamagnetism in half-metallic Co$_{2}$CrAl Heusler alloy

TL;DR

This paper reports the discovery of giant diamagnetism in Co₂CrAl Heusler alloy, which transitions from ferromagnetic behavior above a certain temperature to strong diamagnetism below it, linked to its electronic structure.

Contribution

It reveals a novel diamagnetic phenomenon in a half-metallic Heusler alloy, highlighting the role of electronic structure in magnetic property transitions.

Findings

Giant diamagnetism observed below temperature T_z

Transition from ferromagnetism to diamagnetism at T_z

Diamagnetism possibly initiated by Landau diamagnetism

Abstract

A giant diamagnetism in the Co$_{2}$CrAl compounds, in both bulk and thin film, below a certain temperature ($T_z$) was observed. Above $T_z$, the compound behaves as an ordinary ferromagnet. The diamagnetic alignment might be initiated by the Landau diamagnetism because of the half-metallic properties and the pinning of the diamagnetism is preserved by the peculiar electronic structures.