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High spin polarization and spin signal enhancement in non-local spin valves with Co–Fe alloy injectors and detectors
- Source :
- APL Materials, Vol 11, Iss 5, Pp 051108-051108-8 (2023)
- Publication Year :
- 2023
- Publisher :
- AIP Publishing LLC, 2023.
-
Abstract
- For applications such as spin accumulation sensors for next-generation hard disk drive read heads, and for fundamental research, it is desirable to increase the spin signal in metallic non-local spin valves, which are central devices in spintronics. To this end, here, we report on the integration of high-spin-polarization Co–Fe binary alloy ferromagnetic injectors and detectors in Al-based non-local spin valves. Room-temperature deposition on amorphous substrates from an alloy target is shown to generate smooth, polycrystalline (110-textured), solid-solution body-centered-cubic Co75Fe25 films, which we characterize by energy dispersive x-ray spectroscopy, x-ray diffraction, x-ray reflectivity, atomic force microscopy, and electronic transport. Simple integration into transparent-interface Al non-local spin valves is then shown to realize up to a factor of ∼5 enhancement of the spin signal relative to Co, with full quantitative analysis yielding strikingly temperature-independent current spin polarizations exceeding 60%. We make a detailed quantitative comparison of these values with prior literature, concluding that Co–Fe alloys present a remarkably facile route to higher spin polarization and spin signals in non-local spin valves, with minimal barrier to adoption.
- Subjects :
- Biotechnology
TP248.13-248.65
Physics
QC1-999
Subjects
Details
- Language :
- English
- ISSN :
- 2166532X
- Volume :
- 11
- Issue :
- 5
- Database :
- Directory of Open Access Journals
- Journal :
- APL Materials
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.0cc22fdc916948d59b9e370045a06702
- Document Type :
- article
- Full Text :
- https://doi.org/10.1063/5.0147465