Magnetic relaxation phenomena in the Chiral Magnet Fe${}_{1-x}$Co${}_x$Si: An ac susceptibility study

Abstract

We present a systematic study of the ac susceptibility of the chiral magnet Fe${}_{1-x}$Co${}_x$Si with $x$ = 0.30 covering four orders of magnitude in frequencies from 0.1 Hz to 1 kHz, with particular emphasis to the pronounced history dependence. Characteristic relaxation times ranging from a few milliseconds to tens of seconds are observed around the skyrmion lattice A-phase, the helical-to-conical transition and in a region above $T_C$. The distribution of relaxation frequencies around the A-phase is broad, asymmetric and originates from multiple coexisting relaxation processes. The pronounced dependence of the magnetic phase diagram on the magnetic history and cooling rates as well as the asymmetric frequency dependence and slow dynamics suggest more complicated physical phenomena in Fe${}_{0.7}$Co${}_{0.3}$Si than in other chiral magnets.

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Cited by in corpus (20)

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• Room-temperature skyrmion phase in bulk Cu2OSeO3 under high pressures
• Magnetization and ac susceptibility study of the cubic chiral magnet Mn${}_{1-x}$Fe${}_x$Si
• Magnetic field dependence of the nonlinear magnetic response and tricritical point in the monoaxial chiral helimagnet Cr${}_{1/3}$NbS${}_2$
• Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of Fe${}_{1-x}$Co${}_x$Si
• 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
• Relaxation dynamics of modulated magnetic phases in skyrmion host GaV4S8: an ac magnetic susceptibility study
• Increasing the skyrmion stability in Cu${}_2$OSeO${}_3$ by chemical substitution
• Anomalous electrical transport and magnetic skyrmions in Mn-tuned Co9Zn9Mn2 single crystals
• Pinning of Helimagnetic Phase Transitions in Zn-Substituted Skyrmion Host Cu${}_2$OSeO${}_3$
• Robust cycloid crossover driven by anisotropy in the skyrmion host GaV${}_4$S${}_8$
• Evolution of Helimagnetic Correlations when approaching the Quantum Critical Point of Mn${}_{1-x}$Fe${}_x$Si
• Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi
• Observation of magnetic skyrmion lattice in Cr${}_{0.82}$Mn${}_{0.18}$Ge by small-angle neutron scattering
• Giant and robust topological Hall effect in Chiral Magnet Co7Zn8Mn5
• Dislocation-driven relaxation processes at the conical to helical phase transition in FeGe