History dependence of the magnetic properties of single-crystal Fe${}_{1-x}$Co${}_x$Si

Abstract

We report the magnetization, ac susceptibility, and specific heat of optically float-zoned single crystals of Fe${}_{1-x}$Co${}_x$Si, $0.20\le x\le 0.50$. We determine the magnetic phase diagrams for all major crystallographic directions and cooling histories. After zero-field cooling, the phase diagrams resemble that of the archetypal stoichiometric cubic chiral magnet MnSi. Besides the helical and conical state, we observe a pocket of skyrmion lattice phase just below the helimagnetic ordering temperature. At the phase boundaries between these states evidence for slow dynamics is observed. When the sample is cooled in small magnetic fields, the phase pocket of skyrmion lattice may persist metastably down to lowest temperatures. Taken together with the large variation of the transition temperatures, transition fields, and the helix wavelength as a function of composition, this hysteresis identifies Fe${}_{1-x}$Co${}_x$Si as an ideal material for future experiments exploring, for instance, the topological unwinding of the skyrmion lattice.

14 pages, 11 figures

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• Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
• Thermally Driven Ratchet Motion of Skyrmion Microcrystal and Topological Magnon Hall Effect
• Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
• Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
• Electric field-induced Skyrmion distortion and giant lattice rotation in the magnetoelectric insulator Cu2OSeO3
• Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
• Formation of a topological non-Fermi liquid in MnSi
• Giant generic topological Hall resistivity of MnSi under pressure
• Dissipation processes in the insulating skyrmion compound Cu2OSeO3
• Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet
• Ultra-high vacuum compatible induction-heated rod casting furnace

Cited by in corpus (27)

• Entropy-limited topological protection of skyrmions
• Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi
• Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in Cu${}_2$0SeO${}_3$
• Magnetic relaxation phenomena in the Chiral Magnet Fe${}_{1-x}$Co${}_x$Si: An ac susceptibility study
• Electric field-driven topological phase switching and skyrmion lattice metastability in magnetoelectric Cu${}_2$OSeO${}_3$
• Optically probing symmetry breaking in the chiral magnet Cu2OSeO3
• Magnetization and ac susceptibility study of the cubic chiral magnet Mn${}_{1-x}$Fe${}_x$Si
• Extended skyrmion lattice scattering and long-time memory in the chiral magnet Fe${}_{1-x}$Co${}_x$Si
• Weak crystallization of fluctuating skyrmion textures in MnSi
• 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 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
• Ultra-high vacuum compatible preparation chain for intermetallic compounds
• Evolution of helimagnetic correlations in Mn${}_{1-x}$Fe${}_x$Si with doping: a small-angle neutron scattering study
• 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${}_3$
• Unpinning the skyrmion lattice in MnSi:Effect of substitutional disorder
• Optically excited spin dynamics of thermally metastable skyrmions in Fe${}_{0.75}$Co${}_{0.25}$Si
• Robust cycloid crossover driven by anisotropy in the skyrmion host GaV${}_4$S${}_8$
• Optical creation and annihilation of skyrmion patches in a bulk chiral magnet
• Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi
• Compositional Studies of Metals with Complex Order by means of the Optical Floating-Zone Technique
• Surface pinning and triggered unwinding of skyrmions in a cubic chiral magnet
• Anisotropy-dependent decay of room temperature metastable skyrmions and a nascent double-$q$ spin texture in Co${}_8$Zn${}_9$Mn${}_3$
• Effect of chemical substitution on the skyrmion phase in Cu${}_2$OSeO${}_3$
• Disordered 2D ferromagnetism at the surface of FeSi
• Cubic magnetic anisotropy in $B$20 magnets: Interplay of anisotropy and magnetic order in Fe${}_{1-x}$Co${}_x$Si