Parks, Brad, Abdelgawad, Ahmed, Wong, Thomas et al. (2 more authors) (2020) Magnetoresistance Dynamics in Superparamagnetic Co-Fe- B Nanodots. Physical Review Applied. 014063. ISSN 2331-7019
Abstract
Individual disk-shaped Co-Fe-B nanodots are driven into a superparamagnetic state by a spin-transfer torque, and their time-dependent magnetoresistance fluctuations are measured as a function of current. A thin layer of oxidation at the edges has a dramatic effect on the magnetization dynamics. A combination of experimental results and atomistic spin simulations shows that pinning to oxide grains can reduce the likelihood that fluctuations lead to reversal, and can even change the easy-axis direction. Exchange-bias loop shifts and training effects are observed even at room temperature after brief exposure to small fields. The results have implications for studies of core-shell nanoparticles and small magnetic tunnel junctions and spin-torque oscillators.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2020 American Physical Society. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Dates: |
|
Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 03 Mar 2020 13:40 |
Last Modified: | 16 Oct 2024 16:28 |
Published Version: | https://doi.org/10.1103/PhysRevApplied.13.014063 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevApplied.13.014063 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157965 |
Download
Filename: PhysRevApplied.13.014063.pdf
Description: PhysRevApplied.13.014063