Modulation method of studying two-phase antiferromagnetic domain structures created by a pulsed magnetic field

It is shown that studies of the coercivity of AFM domain walls that arise in antiferromagnets during the first-order spin-orientation transition can be used as a tool for detecting, identifying, and studying spin structures realized in a crystal under the influence of an external magnetic field. The use of high-frequency modulation of the magnetic field made it possible to expand the capabilities of the standard induction method of studying magnetic phase transitions in antiferromagnets. The proposed measurement method was tested on well-known MnF2 and Cr2O3 crystals.