Abstract
In thin films composed of a ferromagnetic (FM) and an antiferromagnetic (AFM) layers, a unidirectional anisotropy occurs when spins at the interface of FM and AFM layers are exchange coupled. The unidirectional anisotropy is responsible for a distinctive shift of a hysteresis loop away from zero along the exciting field axis. The basic physics of FM/AFM exchange coupling remains poorly understood [1, 2]. In this work, in order to clarify the nature of FM/AFM exchange coupling we have performed temperature dependent ferromagnetic resonance (FMR) measurements on FeNi/FeMn bilayers taking into account the bilinear and biquadratic exchange coupling terms.
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