A ferromagnetic skyrmion-based nano-oscillator with modified perpendicular magnetic anisotropy

Document Type

Article

Publication Date

3-15-2021

Abstract

Perpendicular magnetic anisotropy can be induced when the atoms orbital anisotropy in the ultrathin ferromagnetic layer is reflected. Here, we computationally study a ferromagnetic skyrmion-based nano-oscillator model with a composite structure, where the skyrmion dynamics is controlled by modifying perpendicular magnetic anisotropy. The proposed nano-oscillator structure has two concentric circular areas with different anisotropy coefficients. When the anisotropy of the inner area is larger than that of the outer area, the inner area can provide a repulsive force acting on the skyrmion, leading to the motion of skyrmion along with the edge of the inner circular area. Three cases of skyrmion motion are found for different anisotropy coefficients. We also study the effects of each anisotropy coefficients and current density on the frequency of the skyrmion-based nano-oscillator. Our results provide a promising method to modulate the frequency of future skyrmion-based nano-oscillators.

Identifier

85100166671 (Scopus)

Publication Title

Physics Letters Section A General Atomic and Solid State Physics

External Full Text Location

https://doi.org/10.1016/j.physleta.2021.127157

ISSN

03759601

Volume

392

Grant

HKU 17204617

Fund Ref

Applied Basic Research Foundation of Yunnan Province

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