2016/11/21 by Javier F. Pulecio, Aleš Hrabec, Pulecio, Javier F. +9
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.1611.06869
openalex publication_date 2016/11/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Collective spin ensembles known as skyrmion bubbles can exist in ultrathin\nmagnetic film heterostructures and promise miniscule diameters and low-power\nall-electrical manipulation. The nucleation, identification and manipulation of\nskyrmions is of great interest, in part, because of their non-trivial topology.\nHere we ascertain the topology of 100 nm isolated hedgehog skyrmion bubbles and\nprobe their response to external fields at room temperature in [ Pt Co (0.8\nnm) Ir ] films. We find that structural disorder can stabilize skyrmion\nbubble states which exhibit creep-like domain wall motion. This makes the\nextraction of DMI from observations difficult and could explain the larger than\npredicted bubble sizes observed in interfacial DMI films. Intriguingly, we\nreport on a critical size for hedgehog skyrmions, above which the bubbles lose\ncircular symmetry and take up an irregular shape. Combining Lorentz TEM and\nfully three dimensional multi-layered simulations, we demonstrate the unique\nbehavior of these topologically non-trivial spin textures.\n