Abstract
The static magnetic properties and ferromagnetic resonance of the c-axis oriented hcp Co0.85Ir0.15 and Co0.98Ir0.02 soft magnetic films, with an easy-plane magnetocrystalline anisotropy (MA) and a c-axis MA, respectively, are investigated with temperature from 300 K down to 5 K. As the MA is opposite, opposite behavior in the temperature dependence of the effective demagnetization field Heff is observed: a decrement in Co0.98Ir0.02 film and an increment in Co0.85Ir0.15 film, respectively. Moreover, the resonance field HR(T) obtained under high frequency is different from that under low frequency for Co0.85Ir0.15 film, which is significantly different from the similar behavior in HR(T) under each frequency (6–18 GHz) for Co0.98Ir0.02 film. The fitting in HR(T) indicates that the opposite MA is also the primary reason for the different appearance in HR(T). Our findings provide supports to develop the advantages and applications of the soft magnetic films with easy-plane MA.
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