Magnetic-field-induced spin reorientation in a c-cut TmFeO3 single crystal observed by terahertz spectroscopy

In this study, we utilized time-domain terahertz magneto-optical spectroscopy to investigate the spin resonance in a c-cut TmFeO3 single crystal at T = 1.6 K under different magnetic fields and characterized its intricate internal interactions. By selectively exciting the magnetic resonance modes in the crystal, we found that as the magnetic field increases, the quasi-ferromagnetic (q-FM) mode of TmFeO3 single crystal shifts towards higher frequencies, while the quasi-antiferromagnetic (q-AFM) mode transforms into the q-FM mode at low critical magnetic fields (2.2-3.6 T). Through magnetic structure analysis and theoretical calculations, it is confirmed that the magnetic moment of TmFeO3 undergoes a magnetic-field-induced spin reorientation from Gamma 2 to Gamma 4 phase. Materials with magnetic moment flipping at low magnetic fields may find applications for antiferromagnetic spintronic devices in the future.

Automated summary

In this study, time-domain terahertz magneto-optical spectroscopy was used to investigate spin resonance in a c-cut TmFeO3 single crystal. The behavior of the crystal under different magnetic fields was characterized. By selectively exciting magnetic resonance modes, it was found that the quasi-ferromagnetic mode of the crystal shifted towards higher frequencies as the magnetic field increased, while the quasi-antiferromagnetic mode transformed into the quasi-ferromagnetic mode at low critical magnetic fields.