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CONDENSED MATTER

Phase diagram of the ground state of a classical anisotropic frustrated ferromagnet

S. N. Martynov, V. I. Tugarinov

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russia

Abstract: The phase diagram of the ground state is obtained for the one-dimensional easy-axis model of classical spins coupled by ferromagnetic and antiferromagnetic exchanges between nearest and next-nearest neighbors, respectively. The parameters of the incommensurate magnetic structure with a variable step (soliton lattice) are calculated in the mean field approximation from the condition of the collinearity of spins to the effective exchange fields in the continuous approximation. The ground state of the soliton lattice and interfaces between soliton and collinear (ferromagnetic and “up–up–down–down”) phases are determined by the numerical minimization of the average energy over the initial angular velocity of spins.

Received: 23.05.2017

DOI: 10.7868/S0370274X17130070

 English version: Journal of Experimental and Theoretical Physics Letters, 2017, 106:1, 30–34

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