Magnetization and ac susceptibility study of the cubic chiral magnet Mn${}_{1-x}$Fe${}_x$Si

Abstract

We present a comprehensive and systematic magnetization and ac susceptibility study of Mn${}_{1-x}$Fe${}_x$Si over an extensive range of ten Fe concentrations between $x$ = 0 - 0.32. With increasing Fe substitution, the critical temperature decreases but the magnetic phase diagrams remain qualitatively unaltered for $x$ $\le$ $x^{\ast }$ $\approx$ 0.11 with clear boundaries between the helical, conical, and skyrmion lattice phase as well as an enhanced precursor phase. A notably different behavior sets in for $x$ $=$ 0.11, 0.13 and 0.14, where certain characteristics of helimagnetic correlations persist, but without clear phase boundaries. Although a qualitative change already sets in at $x^{\ast }$, the transition temperature and spontaneous magnetization vanish only at $x_C$ = 0.17 where also the average magnetic interactions change sign. Although the Curie-Weiss temperature reaches -12~K for $x$ = 0.32, no signature of long-range magnetic order is found down to the lowest temperature, indicating a possible significant role for quantum fluctuations in these systems.

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Cited by in corpus (12)

• Evolution of magneto-crystalline anisotropies in Mn${}_{1-x}$Fe${}_x$Si and Mn${}_{1-x}$Co${}_x$Si as inferred from small-angle neutron scattering and bulk properties
• Skyrmions and spirals in MnSi under hydrostatic pressure
• Evolution of helimagnetic correlations in Mn${}_{1-x}$Fe${}_x$Si with doping: a small-angle neutron scattering study
• An ac-susceptibility study of magnetic relaxation phenomena in the antiskyrmion hosting tetragonal Mn-Pt(Pd)-Sn system
• Increasing the skyrmion stability in Cu${}_2$OSeO${}_3$ by chemical substitution
• Pinning of Helimagnetic Phase Transitions in Zn-Substituted Skyrmion Host Cu${}_2$OSeO${}_3$
• Cubic B20 helimagnets with quenched disorder in magnetic field
• Physical properties of (Mn 0.85 Fe 0.15) Si along the critical trajectory
• Evolution of Helimagnetic Correlations when approaching the Quantum Critical Point of Mn${}_{1-x}$Fe${}_x$Si
• A combined inelastic neutron scattering and \textit{ab initio} lattice dynamics study of FeSi
• Effect of chemical substitution on the skyrmion phase in Cu${}_2$OSeO${}_3$
• Evolution of magnetic bubble domains in the uniaxial ferromagnet CeRu${}_2$Ga${}_2$B inferred from the Hall effect and ac magnetic susceptibility