Abstract
We investigated the dynamics of exchange bias field HEB of Mn80Ir20 (80 Å)/Co60Fe20B20 (110 Å) thin films at temperatures of 300, 375, and 450 K by means of vector network analyzer ferromagnetic resonance. The results show that HEB deduced from the resonance frequencies along the hysteresis loop varies significantly and that this large variation is due to thermally activated reversal of the antiferromagnetic domains during measurements. Furthermore, the results of HEB as a function of angle show that HEB is mainly unidirectional with fewer contributions from the uniaxial anisotropy as evidenced by the fits to the data based on the Fourier cosine series. It is also found that the symmetries of HEB at temperatures higher than 300 K decreases compared with that at 300 K.
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