Fe Doping-Induced Magnetic Solitons in CrNb3S6

Helicoidal ferromagnetic materials' spin spirals in the magnetic soliton lattice provide excellent computer storage capability. In this study, we successfully prepared Fe x Cr 1− x Nb 3 S 6 powders using powder metallurgy. Through elemental analysis and x-ray diffraction analysis, the consistent distribution of Fe elements throughout the powder and the solid solution of Fe into Cr atom occupancy were confirmed . The magnetization response to a magnetic field exhibited a complex behavior, as the gradual replacement of Cr with Fe transformed the material from ferromagnetism to antiferromagnetism. Additionally, step-like magnetic transitions in FeNb 3 S 6 powders were discovered . To further explore these phenomena, we prepared FeNb 3 S 6 single crystals using chemical vapor transport. The single crystal analysis revealed a highly distinct pattern of more stable steps (30–120 K) in the d M /d H curve, indicating a change in spin spirals within the magnetic solitons due to minor magnetic disturbances and a strong anisotropy energy. The replacement of Cr by Fe leads to a rearrangement of the direction of magnetic moments, resulting in the disappearance and emergence of the magnetic solitons. These findings contribute to the development of a novel material system for spintronic memory devices, harnessing a chiral magnetic structure.