Work

Current-driven skyrmion dynamics in disordered films

Year: 2017

Type: article

Abstract: A theoretical study of the current-driven dynamics of magnetic skyrmions in disordered perpendicularly magnetized ultrathin films is presented. The disorder is simulated as a granular structure, in which the local anisotropy varies randomly from grain to grain. The skyrmion velocity is computed for different disorder parameters and ensembles. Similar behavior is seen for spin-torques due to in-plane currents and the spin Hall effect, where a pinning regime can be identified at low currents with a transition towards the disorder-free case at higher currents, similar to domain wall motion in disordered films. Moreover, a current-dependent skyrmion Hall effect and fluctuations in the core radius are found, which result from the interaction with the pinning potential.

Source: Applied Physics Letters

DOI: 10.1063/1.4979316

Authors: Joo-Von Kim, Myoung-Woo Yoo

Institutions: Université Paris-Sud, Centre National de la Recherche Scientifique, Université Paris-Saclay, Centre de Nanosciences et de Nanotechnologies, Laboratoire Albert Fert

Language: English

Topic: Magnetic properties of thin films

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: European Commission, Agence Nationale de la Recherche

Awards: Magnetic Skyrmions for Future Nanospintronic Devices, Skyrmions in Ultrathin Magnetic Films towards Low-Power Spintronics