We have conducted a terahertz spectroscopic study of antiferromagnetic resonances in bulk orthoferrite YFe1-xMnxO3 0 ≤ x ≤ 0.4. Both the quasi-ferromagnetic resonance mode and the quasi-antiferromagnetic resonance mode in the weak ferromagnetic Γ4 phase disappear near the spin reorientation temperature, TSR, for the onset of the collinear antiferromagnetic Γ1 phase (x ≥ 0.1). 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.
|Journal||Applied Physics Letters|
|Publication status||Published - 2021 Nov 8|
Bibliographical noteFunding Information:
This research was supported by the National Research Foundation (NRF) of Korea grants funded by the Korea government (MIST) (Nos. NRF-2021R1A2C3004989, NRF-2017R1A5A1014862, and NRF-2019R1A2C2002601) and by the Institute for Basic Science (No. IBS-R011-D1).
© 2021 Author(s).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)