Mn2V0.5Co0.5Z (Z= Ga, Al) Heusler alloys: Fully compensated ferrimagnets with high Tc and compensation temperature

TL;DR

This study investigates Mn2V0.5Co0.5Z (Z=Ga, Al) Heusler alloys, demonstrating high Curie temperatures and nearly zero net magnetic moments at room temperature, with properties influenced by sample preparation methods.

Contribution

It reports the synthesis and magnetic characterization of high Tc fully compensated ferrimagnets Mn2V0.5Co0.5Z, highlighting the effects of fabrication techniques on magnetic properties.

Findings

Nearly fully compensated magnetic moments at room temperature.

High Curie temperatures exceeding 640 K.

Differences in magnetic behavior between bulk and ribbon samples.

Abstract

High TC fully compensated ferrimagnets are potential candidates for spin transfer torque based spintronic devices. We report the structural and magnetic properties of high TC fully compensated ferrimagnets Mn2V0.5Co0.5Z where Z is Ga, Al, in the melt spun ribbon and arc melted bulk form. While the parent alloys Mn2YZ where Y is V, Co and Z is Ga, Al exhibits a magnetic moment value around 2 muB per f.u, the Mn2V0.5Co0.5Ga alloy exhibits room temperature nearly fully compensated moment value of 0.09 and 0.13 muB per f.u. in the bulk and ribbon form respectively. For Mn2V0.5Co0.5Al this turned out to be 0.04 and 0.08 muB per f.u. In Contrast to the bulk sample's Neel P type ferrimagnetic behaviour, ribbon samples exhibit Neel N type ferrimagnetic characteristic with a high compensation temperature of 420 K for Ga alloy and 275 K for Al alloy. The observed TC values are more than 640 K for all samples. The differences in the magnetic properties of arc melted and melt spun alloys indicates that even a slight variation in stoichiometry and sample preparation method can influence the physical properties of a compensated system.