COERCIVITY OF INTERPHASE BOUNDARIES AT MAGNETIZATION OF ANTIFERROMAGNETIC MNF2 IN THE INTERMEDIATE STATE

Magnetic susceptibility of AFM manganese fluoride has been studied at the intermediate state under the spin-flop transition. The sample magn etization component related to the irreversible displacement of interp hase boundaries is separated experimentally. In particular, at a stric t orientation of an external magnetic field along the crystal easy axi s magnetic susceptibility of a sample induced by the irreversible disp lacement of domain walls by the Barkhausen jumps is about 75% of the t otal susceptibility. Proceeding from specific features of the experime ntal curves, a method of the exact determination of position of specia l points on the phase diagram of AFM crystals is proposed.