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High TC fully compensated ferrimagnets are potential candidates for spintransfer torque based spintronic devices. We report the structural and magneticproperties of high TC fully compensated ferrimagnets Mn2V0.5Co0.5Z where Z isGa, Al, in the melt spun ribbon and arc melted bulk form. While the parentalloys Mn2YZ where Y is V, Co and Z is Ga, Al exhibits a magnetic moment valuearound 2 muB per f.u, the Mn2V0.5Co0.5Ga alloy exhibits room temperature nearlyfully compensated moment value of 0.09 and 0.13 muB per f.u. in the bulk andribbon form respectively. For Mn2V0.5Co0.5Al this turned out to be 0.04 and0.08 muB per f.u. In Contrast to the bulk sample's Neel P type ferrimagneticbehaviour, ribbon samples exhibit Neel N type ferrimagnetic characteristic witha 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 inthe magnetic properties of arc melted and melt spun alloys indicates that evena slight variation in stoichiometry and sample preparation method can influencethe physical properties of a compensated system.

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