Terahertz spectroscopy of antiferromagnetic resonances in YFe1− xMnxO3 0≤ x≤ 0.4 across a spin reorientation transition

Lee, Howon, Taek Sun Jung, Hyun Jun Shin, Sang Hyup Oh, Kyung Ik Sim, Taewoo Ha, Young Jai Choi, and Jae Hoon Kim. "Terahertz spectroscopy of antiferromagnetic resonances in YFe1− xMnxO3 0≤ x≤ 0.4 across a spin reorientation transition." Applied Physics Letters 119, no. 19 (2021): 192903.

for full paper see https://aip.scitation.org/doi/full/10.1063/5.0070952

Abstract

e have conducted a terahertz spectroscopic study of antiferromagnetic resonances in bulk orthoferrite YFe1−xMnxO3  (0≤x≤0.4).  Below TSR, an antiferromagnetic resonance mode emerges and exhibits a large blueshift with decreasing temperature. However, below 50 K, this mode softens considerably, and this tendency becomes stronger with Mn doping. We provide a deeper understanding of such behaviors of the antiferromagnetic resonance modes in terms of the influence of the Mn3+ ions on the magnetocrystalline anisotropy. Our results show that terahertz time-domain spectroscopy is a useful, complementary tool in tracking magnetic transitions and probing the interaction between disparate magnetic subsystems in antiferromagnetic materials with multiple ionic species.

From the experimental section of the paper 

"Our terahertz transmission measurements were conducted on a Teraview TPS3000 (Teraview Ltd., UK) in the frequency range of 0.1–3 THz with the sample temperature controlled over the range of 4–300 K by a helium-free optical cryostat (Cryostation, Montana Instruments, Ltd., USA). All measurements were carried out in dry nitrogen or in vacuum to remove the water-vapor absorption. For transmission measurements, the samples were attached to a holder with a 3 mm hole by using silver paste. Our THz-TDS technique yielded raw data in the form of time-dependent waveforms of electric fields, and these were converted into complex-valued functions of frequency through the fast Fourier transform (FFT). "

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$d$ is the thickness of the sample.