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Annealing process of Co-Fe-B based multilayers showing skyrmion Brownian motion

Authors :
Minori Goto
Ryo Ishikawa
Hikaru Nomura
Yoshishige Suzuki
Source :
AIP Advances, Vol 13, Iss 2, Pp 025216-025216-5 (2023)
Publication Year :
2023
Publisher :
AIP Publishing LLC, 2023.

Abstract

Skyrmions are topological spin textures that exhibit Brownian motion in solids. They have attracted increasing research interest in terms of realizing a device that utilizing stochastic behavior and investigating new physical phenomena. However, skyrmions that exhibit Brownian motion are sensitive to changes in magnetic properties and are easily affected by aging variation. For instance, although skyrmions appear in a sample immediately after fabrication, they sometimes disappear after few weeks. This characteristic prevents the reproducibility experiment and affects device stability. In this study, we demonstrated that aging variation can be suppressed by annealing in air for only 3 min, which is an easy and rapid method. We investigated the change in the magnetic properties by annealing and air exposure and found that the main mechanism of aging variation is oxidation of the sample surface. The magnetic properties of samples with Pt and thick SiO2 capping were analyzed, and we demonstrated that aging variation can be suppressed by avoiding surface oxidation. Our work accelerates the research of fundamental physics regarding skyrmion Brownian motion and of device applications utilizing stochastic system.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
13
Issue :
2
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.0c4d985146eb4f8cb267bfeb1514f495
Document Type :
article
Full Text :
https://doi.org/10.1063/9.0000582