Dipolar-stabilized first and second-order antiskyrmions in ferrimagnetic multilayers
Abstract
Skyrmions and antiskyrmions are topologically protected spin structures with opposite topological charge. Particularly in coexisting phases, these two types of magnetic quasi-particles may show fascinating physics and potential for spintronic devices. While skyrmions are observed in a wide range of materials, until now antiskyrmions were exclusive to materials with D2d symmetry. In this work, we show first and second-order antiskyrmions stabilized by magnetic dipole-dipole interaction in Fe/Gd-based multilayers. We modify the magnetic properties of the multilayers by Ir insertion layers. Using Lorentz transmission electron microscopy imaging, we observe coexisting antiskyrmions, Bloch skyrmions, and type-2 bubbles and determine the range of material properties and magnetic fields where the different spin objects form and dissipate. We perform micromagnetic simulations to obtain more insight into the studied system and conclude that the reduction of saturation magnetization and uniaxial anisotropy leads to the existence of this zoo of different spin objects and that they are primarily stabilized by dipolar interaction.
Cite
@article{arxiv.2010.06555,
title = {Dipolar-stabilized first and second-order antiskyrmions in ferrimagnetic multilayers},
author = {Michael Heigl and Sabri Koraltan and Marek Vaňatka and Robert Kraft and Claas Abert and Christoph Vogler and Anna Semisalova and Ping Che and Aladin Ullrich and Timo Schmidt and Julian Hintermayr and Dirk Grundler and Michael Farle and Michal Urbánek and Dieter Suess and Manfred Albrecht},
journal= {arXiv preprint arXiv:2010.06555},
year = {2021}
}