Influence Of Thermal Deformation On Exchange Bias In Fega/Irmn Bilayers Grown On Flexible Polyvinylidene Fluoride Membranes

We investigated the influence of thermal deformation on the magnetic properties of flexible FeGa/IrMn exchange-biased (EB) bilayers grown on polyvinylidene fluoride (PVDF) membranes with the pinning direction parallel to the thermal deformation directions alpha(31) and alpha(32) of PVDF. Because with increasing temperature, the uniaxial anisotropy is reoriented from the alpha(32) to alpha(31) directions by the thermally induced compressive strain along the alpha(32) direction, both the coercive field H-c and the loop squareness M-r/M-s of FeGa/IrMn bilayers display a complex temperature-dependent behavior. The EB field H-c decreases with increasing temperature. A modified Stoner-Wohlfarth model was employed to account for the temperature dependence of magnetic properties in the flexible FeGa/IrMn bilayers.