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Fan-type spin structure in uni-axial chiral magnets

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arxiv 1705.07778 v1 pith:YHGKWQL2 submitted 2017-05-22 cond-mat.str-el cond-mat.stat-mech

Fan-type spin structure in uni-axial chiral magnets

classification cond-mat.str-el cond-mat.stat-mech
keywords structurechiralphaseboundaryfan-typehelimagnetisolatedmodulation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the spin structure of a uni-axial chiral magnet near the transition temperatures in low fields perpendicular to the helical axis. We find a fan-type modulation structure where the clockwise and counterclockwise windings appear alternatively along the propagation direction of the modulation structure. This structure is often realized in a Yoshimori-type (non-chiral) helimagnet but it is rarely realized in a chiral helimagnet. To discuss underlying physics of this structure, we reconsider the phase diagram (phase boundary and crossover lines) through the free energy and asymptotic behaviors of isolated solitons. The fan structure appears slightly below the phase boundary of the continuous transition of instability-type. In this region, there are no solutions containing any types of isolated solitons to the mean field equations.

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  1. Quasi-1D Spin Textures: From Chiral Soliton Lattice to Fan State

    cond-mat.mtrl-sci 2026-06 unverdicted novelty 5.0

    Resonant elastic X-ray scattering in Mn1.4PtSn reveals a field-induced transition from a π-chiral soliton lattice to a fan state with continuously decreasing modulation length when the field is applied perpendicular t...