Systematic Control of Ferrimagnetic Skyrmions via Composition Modulation in Pt/Fe_1–xTb_x/Ta Multilayers

Abstract

Magnetic skyrmions are topological spin textures that can be used as memory and logic components for advancing the next generation spintronics. In this regard, control of nanoscale skyrmions, including their sizes and densities, is of particular importance for enhancing the storage capacity of skyrmionic devices. Here, we propose a viable route for engineering ferrimagnetic skyrmions via tuning the magnetic properties of the involved ferrimagnets Fe 1−x Tb x . Via tuning the composition of Fe 1−x Tb x that alters the magnetic anisotropy and the saturation magnetization, the size of the ferrimagnetic skyrmion (d s ) and the average density (η s ) can be effectively tailored in [Pt/Fe 1−x Tb x /Ta] 10 multilayers. In particular, a stabilization of sub-50 nm skyrmions with a high density is demonstrated at room temperature. Our work provides an effective approach for designing ferrimagnetic skyrmions with the desired size and density, which could be useful for enabling highdensity ferrimagnetic skyrmionics.

Channeling skyrmions: Suppressing the skyrmion Hall effect in ferrimagnetic nanostripes

“…54,55 Additionally, FI SKs have been experimentally observed in several materials, including thin films [56][57][58][59][60][61][62][63] and stacked multilayers. 24,[64][65][66][67][68] Furthermore, FI skyrmions can also be printed and deleted in a feasible and reproducible way at room temperature by using electric stimuli. 24,65 To accomplish that, a challenge concerning its direct observation must be overcome: indeed, FM Sks have been detected by means of electrical response that SkHE leaves back.…”