FMR Studies of Exchange-Biased Heusler Alloy Thin Films

Abstract

© 2020, Springer-Verlag GmbH Austria, part of Springer Nature. Ferromagnetic resonance (FMR) and SQUID-magnetization measurements were performed out to assess the potential of using the antiferromagnetic IrMn compound as an exchange-bias layer for the Heusler alloy layer Co 2Cr 1-xFe xAl y in the superconducting spin valve structure. It was observed that the exchange-bias field for the Heusler alloy film deposited directly on IrMn is close to zero. Introducing the Py (Ni 0.8Fe 0.2) interlayer between the IrMn and Heusler alloy layers improves the biasing property, but it is not enough for using it in the superconductivity spin valve. Furthermore, it was found that the magnitude of the exchange-bias field determined from the FMR data is several times smaller that obtained from the SQUID-magnetization measurements.