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Thermal fluctuations in the conical state of monoaxial helimagnets

AuthorsLaliena, Victor; Kato, Yusuke; Albalate, Germán; Campo, Javier
Issue Date2018
PublisherAmerican Physical Society
CitationPhysical Review B 98(14): 144445 (2018)
AbstractThe effect of thermal fluctuations on the phase structure of monoaxial helimagnets with external magnetic field parallel to the chiral axis is analyzed by means of a saddle point expansion of the free energy. The phase transition that separates the conical and forced ferromagnetic phases is changed to first order by the thermal fluctuations. In a purely monoaxial system the pitch of the conical state remains independent of temperature and magnetic field, as in mean-field theory, even when fluctuations are taken into account. However, in the presence of weak Dzyaloshinskii-Moriya interactions in the plane perpendicular to the chiral axis, thermal fluctuations induce a dependence of the pitch on temperature and magnetic field. This may serve to determine the nature of magnetic interactions in such systems.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.98.144445
Appears in Collections:(ICMA) Artículos
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