Spiral plane flops in frustrated helimagnets in external magnetic field

Abstract

We discuss theoretically frustrated Heisenberg spiral magnets in magnetic field $\mathbf{H}$. We demonstrate that small anisotropic spin interactions (single-ion biaxial anisotropy or dipolar forces) select the plane in which spins rotate (spiral plane) and can lead to the spiral plane flop upon in-plane field increasing. Expressions for the critical fields $H_{flop}$ are derived. It is shown that measuring of $H_{flop}$ is an efficient and simple method of quantifying the anisotropy in the system (as the measurement of spin-flop fields in collinear magnets with axial anisotropy). Corresponding recent experiments are considered in spiral magnets some of which are multiferroics of spin origin.

8 pages, 1 figure

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Cited by in corpus (6)

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• Phase competition in frustrated anisotropic antiferromagnet in strong magnetic field
• Surface monolayers and magnetic field
• Ferromagnetic monolayer with interfacial Dzyaloshinskii-Moriya interaction: magnon spectrum and effect of quenched disorder