Uncompensated Spin Elements in Ferromagnetic and Antiferromagnetic Bilayer with Non-Collinear Spin Structure

Abstract

The exchange bias in a ferromagnetic (FM) and antiferromagnetic (AFM) bilayer with a γ-phase disordered structure has been investigated within a framework of Heisenberg model. The magnetic atoms in the AFM layer realize the triple Q structure due to geometrical spin frustrations. This non-collinear spin structure can bring about an exchange bias in the FM/AFM bilayer system. Under the influence of the exchange bias, the uncompensated spin element appears in the AFM layer, accompanied by a shifted loop in magnetization curves, in accord with the measured loop by X-ray magnetic circular dichroism spectroscopy for an AFM layer.