Alhuwaymel, Tariq Fahad H, Kubota, Takahide, Kim, Jun-Young orcid.org/0000-0002-1639-3270 et al. (2 more authors) (2023) Half-Metallic Bandgap Measurement Using Circularly-Polarised Infrared Light. Spin. ISSN 2010-3255
Abstract
One avenue towards next generation spintronic devices is to develop half-metallic ferromagnets with 100% spin polarisation and Curie temperature above room temperature. Half-metallic ferromagnets have unique density of states, where the majority spins are metallic but the minority spins are semiconducting with the Fermi level lying within an energy gap. To date, the half-metallic bandgap has been predominantly estimated using Jullière’s formula in a magnetic tunnel junction or measured by the Andreev reflection at low temperature, both of which are very sensitive to the surface/interface spin polarisation. Alternative optical methods such as photoemission have also been employed but with a complicated and expensive set-up. In this study, we developed and optimised a new technique to directly measure the half-metallic bandgap by introducing circularly-polarised infrared light to excite minority spins. The absorption of the light represents the bandgap under a magnetic field to saturate the magnetisation of a sample. This technique can be used to provide simple evaluation of a half-metallic film.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Electronic Engineering (York) |
Depositing User: | Pure (York) |
Date Deposited: | 28 Feb 2023 11:40 |
Last Modified: | 16 Oct 2024 19:05 |
Published Version: | https://doi.org/10.1142/S2010324723500078 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | 10.1142/S2010324723500078 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:196884 |
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Filename: bandgap_230123.docx
Description: Half-Metallic Bandgap Measurement Using Circularly Polarized Infrared Light