Multiple magnetic droplet solitions from exotic spin-orbit torques

Robin Klause, Axel Hoffmann

Research output: Contribution to journalArticlepeer-review

Abstract

Materials with large spin-orbit interactions generate pure spin currents with spin polarizations parallel to the interfacial surfaces that give rise to conventional spin-orbit torques. These spin-orbit torques can only efficiently and deterministically switch magnets with in-plane magnetization. Additional symmetry breaking, such as in non-collinear antiferromagnets, can generate exotic, unconventional spin-orbit torques that are associated with spin polarizations perpendicular to the interfacial planes. Here, we use micromagnetic simulations to investigate whether such exotic spin-orbit torques can generate magnetic droplet solitions in out-of-plane magnetized geometries. We show that a short, high current pulse followed by a lower constant current can nucleate and stabilize magnetic droplets. Through specific current pulse lengths, it is possible to control the number of droplets in such a system, since torques are generated over a large area. Additionally, the nucleation current scales with the out-of-plane component of the spin polarization and is linear as a function of magnetic field strength.

Original languageEnglish (US)
Article number242407
JournalApplied Physics Letters
Volume120
Issue number24
DOIs
StatePublished - Jun 13 2022

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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