Antiferromagnetic (AFM) materials have attracted attention for device applications due to the absence of the stray field and highfrequency
response. To integrate AFM materials into magnetic devices, the understanding of the interfacial effect between AFM and
ferromagnetic (FM) materials is required. In particular, magnetization dynamics and magnetic damping are critical phenomena to be
elucidated since they govern magnetization switching, spin-wave propagation, etc. Although a conventional method for studying the
interfacial effects is stacking materials, the approach may cause unfavorable factors. To get insight into the dynamic properties at the
AFM and FM interfaces, we have focused on B2-ordered FeRh, showing the first-order phase transition from the AFM to FM states,
since the coexistence of AFM and FM domains occurs during transitions, which is an ideal platform for studying interfacial effects.
For this study, we have studied ferromagnetic resonance (FMR) of FeRh thin films during the AFM–FM phase transition as a function
of temperature. From the FMR measurements, we characterize the temperature dependence of the effective Gilbert damping constant
αeff. We find that αeff decreases with increasing temperature, indicating that the temperature variation of the effective Gilbert damping
constant originates from the exchange interaction between the AFM and FM domains in the film and/or AFM domains as a spin
sink.
各種検索
サポート
ヘルプ