Abstract
Antiferromagnetic (AFM) materials have attracted attention for device applications due to the absence of the stray field and high-frequency 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.
Highlights
INTRODUCTIONMagnetization dynamics is at the root of various magnetic phenomena such as magnetization reversal, domain wall motion, and spin-wave propagation. In particular, magnetic damping accompanied by magnetization dynamics is a central topic for designing spintronic devices since it governs the time scale of the decay of the dynamics. Due to the importance for spintronic applications, the physical mechanism of magnetic damping has been studied, and it is generally accepted that magnetic damping is attributed to the energy dissipation from the spin system to the lattice one via spin-orbital coupling. Some experimental results are consistent with the theoretical descriptions. In addition, the damping phenomena at interfaces between different magnetic phases have attracted attention since the damping reflects physical phenomena at the interface such as spin pumping
We show ferromagnetic resonance (FMR) of equicompositional FeRh thin films as a function of temperature to get insight into the interfacial effect on magnetization damping during the AFM–FM phase transition
We find that αeff decreases with increasing temperature, indicating that the temperature variation of the effective Gilbert damping constant reflects the evolution of the interface between AFM and FM phases, which originates from the exchange interaction between the AFM and FM domains in the film and/or AFM domains as a spin sink
Summary
Magnetization dynamics is at the root of various magnetic phenomena such as magnetization reversal, domain wall motion, and spin-wave propagation. In particular, magnetic damping accompanied by magnetization dynamics is a central topic for designing spintronic devices since it governs the time scale of the decay of the dynamics. Due to the importance for spintronic applications, the physical mechanism of magnetic damping has been studied, and it is generally accepted that magnetic damping is attributed to the energy dissipation from the spin system to the lattice one via spin-orbital coupling. Some experimental results are consistent with the theoretical descriptions. In addition, the damping phenomena at interfaces between different magnetic phases have attracted attention since the damping reflects physical phenomena at the interface such as spin pumping.. One of the obstacles for studying the interfacial effect on damping is creating an ideal platform by stacking different materials. Compared to the AFM/FM interface created by stacking materials, the unique phase transition and the coexistence of the AFM and FM phases are ideal platforms for studying the interfacial effect on magnetic damping. We show ferromagnetic resonance (FMR) of equicompositional FeRh thin films as a function of temperature to get insight into the interfacial effect on magnetization damping during the AFM–FM phase transition. We find that αeff decreases with increasing temperature, indicating that the temperature variation of the effective Gilbert damping constant reflects the evolution of the interface between AFM and FM phases, which originates from the exchange interaction between the AFM and FM domains in the film and/or AFM domains as a spin sink
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
