Effects of tilted magnetocrystalline anisotropy on magnetic domains in Fe3Sn2 thin plates

Abstract

We studied effects of tilted magnetocrystalline anisotropy on the magnetic domains in a bubble-hosting magnet ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$. With increasing the in-plane uniaxial magnetocrystalline anisotropy, the magnetic ground state in ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ thin plates changes from disordered stripe domains to stripe domains with preferred orientation. Through transport of intensity equation analysis, we further characterized the transition from skyrmion bubbles to biskyrmionlike configurations with increase in the tilted in-plane magnetocrystalline anisotropy when an out-of-plane magnetic field was applied. In addition, differential phase contrast scanning transmission electron microscopy (DPC-STEM) observations and micromagnetic simulations were carried out to confirm that the biskyrmionlike configurations were type-II bubbles. We show that, in addition tilting a magnetic field to induce misalignment between the magnetic field and the easy magnetization axis, tilting the uniaxial magnetic anisotropy can also be used to stabilize type-II bubbles. Our results also indicate DPC-STEM can help to distinguish between type-II bubbles and biskyrmions.