Temperature dependence of microwave absorption phenomena in single and biphase soft magnetic microwires

For biphase, CoFeSiB/FeNi, microwires, the absorption phenomena at RT also follow the Kittel condition. The observed opposite evolution with temperature of resonance field, Hr, in 2 and 4 µm thick FeNi samples is interpreted considering the opposite sign of magnetostriction of the respective FeNi layers. The stress-induced magnetic anisotropy field, HK, in the FeNi shell is deduced to change sign at around 130 K.