Magnetic Structure-Dependent\nSpin Texture Lattice\nin Hexagonal MnFeCoGe Magnets

Topological spin textures are of great significance in\nmagnetic\ninformation storage and spintronics due to their high storage density\nand low drive current. In this work, the transformation of magnetic\nconfiguration from chaotic labyrinth domains to uniform stripe domains\nwas observed in MnFe<sub>1–<i>x</i></sub>Co<sub><i>x</i></sub>Ge magnets. This change occurs due to the noncollinear\nmagnetic structure switching to a uniaxial ferromagnetic structure\nwith increasing Co content, as identified by neutron diffraction results\nand Lorentz transmission electron microscopy (L-TEM). Of utmost importance,\na hexagonal lattice of high-density robust type-II magnetic bubble\nlattice was established for <i>x</i> = 0.8 through out-of-plane\nmagnetic field stimulation and field-cooling. The dimensions of the\ntype-II magnetic bubbles were found to be tuned by the sample thickness.\nTherefore, the stabilization of complex magnetic spin textures, associated\nwith enhanced uniaxial ferromagnetic interaction and magnetic dipole–dipole\ninteraction in MnFe<sub>1–<i>x</i></sub>Co<sub><i>x</i></sub>Ge through magnetic structure manipulation, as further\nconfirmed by the micromagnetic simulations, will provide a convenient\nand efficient strategy for designing topological spin textures with\npotential applications in spintronic devices.