Resonance properties of magnetic helical structures
B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine47 Nauky Ave., Kharkiv 61103, Ukraine
V.N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv 61077, Ukraine
Received March 16, 2020, published online May 26, 2020
The dependence for the frequencies of the internal modes on the external field in spiral structures in easy-plane antiferromagnets with a small in-plane anisotropy are studied theoretically in a wide region of the fields including the spin-flop transition field. The theoretical results are compared with the known experimental data for the antiferromagnetic resonance in NdFe3(BO3)4. This comparison enabled to reconstruct the dependence for the spiral period of the magnetic structure on the external field.
Key words: antiferromagnet, antiferromagnetic resonance, helix, excitation modes.