Role of magnetic anisotropy constant orders and thermal noise on skyrmion formation in the Co/Pt square nanostructure

Skyrmions, which are topologically stable magnetic structures, have manifested promising features to be used as an information carrier in new-age, non-volatile data storage devices. In this article, Co / Pt square nanostructure with Co-free layer thickness in the range of 1–5 nm and first- and secon...

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Bibliographic Details
Published in:Pramāṇa 2025-01, Vol.99 (1), Article 21
Main Authors: Mukherjee, Tamali, Murthy, V Satya Narayana
Format: Article
Language:English
Subjects:
Anisotropy
Astronomy
Astrophysics and Astroparticles
Cobalt
Data storage
Hypothetical particles
Magnetic anisotropy
Nanostructure
Observations and Techniques
Particle theory
Physics
Physics and Astronomy
Platinum
Spin dynamics
Temperature effects
Thermal noise
Thickness
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Summary:Skyrmions, which are topologically stable magnetic structures, have manifested promising features to be used as an information carrier in new-age, non-volatile data storage devices. In this article, Co / Pt square nanostructure with Co-free layer thickness in the range of 1–5 nm and first- and second-order anisotropy constants are taken to study the controlled formation of skyrmions. The magnetisation dynamics controlled by the current-induced spin transfer torque help to nucleate skyrmions by transforming the perpendicularly magnetised ground state. This process leads to a stable state of the isolated skyrmions via a complex transformation of the Neel wall following its image inversion. Skyrmion numbers vary with increasing thickness as the current density gradually increases. The impact of higher-order anisotropy constants (up to the second order) on the relaxed state of a system, compared to the first-order anisotropy alone, has been examined. Additionally, the effect of temperature on the formation of skyrmions has been analysed for all thicknesses.
ISSN:0973-7111
0304-4289
0973-7111
DOI:10.1007/s12043-024-02878-0