Incommensurate phases in ferromagnetic spin-chains with weak antiferromagnetic interchain interaction

Details Incommensurate phases in ferromagnetic spin-chains with weak antiferromagnetic interchain interaction Incommensurate phases in ferromagnetic spin-chains with weak antiferromagnetic interchain interaction

1997-05-27

arxiv.org/abs/cond-mat/9705280v1

Physics

Condensed Matter

Statistical Mechanics

12 pages, ReVTeX, 13 figures, to be published in Z. Physik

Scientific paper

10.1007/s002570050433

We study planar ferromagnetic spin-chain systems with weak antiferromagnetic inter-chain interaction and dipole-dipole interaction. The ground state depends sensitively on the relative strengths of antiferromagnetic exchange and dipole energies kappa=J'a^2c/(g_L\mu_B)^2. For increasing values of \kappa, the ground state changes from a ferromagnetic via a collinear antiferromagnetic and an incommensurate phase to a 120^o structure for very large antiferromagnetic energy. Investigation of the magnetic phase diagram of the collinear phase, as realized in CsNiF_3, shows that the structure of the spin order depends sensitivly on the direction of the magnetic field in the hexagonal plane. For certain angular domains of the field incommensurate phases appear which are separated by commensurate phases. When rotating the field, the wave vector characterizing the structure changes continuously in the incommensurate phase, whereas in the commensurate phase the wave vector is locked to a fixed value describing a two-sublattice structure. This is a result of the competition between the exchange and the dipole-dipole interaction.

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