Transport signatures of magnetic texture evolution in a microfabricated thin plate of antiskyrmion-hosting (Fe,Ni,Pd)3P

Field-induced evolution of magnetic textures in a spatially confined geometry is investigated by transport and imaging techniques for a microfabricated thin plate of antiskyrmion-hosting ferromagnet ${(\mathrm{Fe},\mathrm{Ni},\mathrm{Pd})}_{3}\mathrm{P}$. Magnetic textures and accompanying transport characteristics show history-dependent evolution under the magnetic fields. In the up-sweep of magnetic field for a metastable antiskyrmion state, the longitudinal and Hall resistivity monotonously develop without conspicuous anomalies, due to the gradual shrinkage of the topologically-protected antiskyrmions in size. On the other hand, a row of magnetic bubbles and/or a stripe domain sequentially emerges one by one in a discretized manner upon decreasing magnetic field from the field-polarized single domain state. This gives rise to contrasting behavior with the field-increasing process, namely anomalous jumps in Hall resistivity at the several field values that are dictated by the sample and magnetic texture sizes, over a broad temperature range. Micromagnetic simulations reproduce qualitative features of the down-sweep process well, and also indicate the importance of the inherent small uniaxial magnetic anisotropy. Our work demonstrates that such a microfabricated magnetic device with a comparable size of magnetic texture may enable an electrical readout of magnetic states.