Abstract
Temperature dependence of the antiferromagnetic resonance spectrum in a thulium orthoferrite (TmFeO3) poly-crystalline sample was studied by transmission spectroscopy in the frequency range of 0.1–0.75 THz and temperature range of 300–670 K, up to its Néel temperature. We observed quasi-ferromagnetic resonance and the quasi-antiferromagnetic resonance modes. The temperature dependence of the resonance frequencies, linewidths, and amplitudes were extracted. The resonance spectrum of TmFeO3 near its Néel temperature was directly observed and a drastic drop in resonance frequency for both modes was observed.
Highlights
Antiferromagnetic materials are under intensive research during recent years owing to their terahertz (THz) frequencies dynamics, indifference to external magnetic fields and to the abundance of mate rials available [1,2,3,4]
The temperature dependence of the antiferromagnetic resonance in TmFeO3 is studied at high temperatures by a continuous-wave method
Due to the spin canting, the antiferromagnetic resonance has two modes, the quasi-antiferromagnetic resonance mode at higher frequency, exited when a dynamical magnetic field h is parallel to the magnetization (h‖m), and the quasi-ferromagnetic resonance mode at lower frequency, excited when h⊥m
Summary
Antiferromagnetic materials are under intensive research during recent years owing to their terahertz (THz) frequencies dynamics, indifference to external magnetic fields and to the abundance of mate rials available [1,2,3,4]. Their magnetic properties strongly depend on temperature and that might be an obstacle for their use in applications. Due to the spin canting, the antiferromagnetic resonance has two modes, the quasi-antiferromagnetic resonance (qAFMR) mode at higher frequency, exited when a dynamical magnetic field h is parallel to the magnetization (h‖m), and the quasi-ferromagnetic resonance (qFMR) mode at lower frequency, excited when h⊥m
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