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Ion beam etching dependence of spin–orbit torque memory devices with switching current densities reduced by Hf interlayers
- Source :
- APL Materials, Vol 9, Iss 9, Pp 091101-091101-10 (2021)
- Publication Year :
- 2021
- Publisher :
- AIP Publishing, 2021.
-
Abstract
- We report on the fabrication of nanoscale, three-terminal in-plane spin–orbit torque switching devices with low switching current densities. Critical parameters in the fabrication process, including the ion beam etching angle and time, were optimized to avoid fabrication defects and improve device yield. Measurements of the magnetic field and current-induced switching behavior of the tunnel junctions demonstrate a sensitivity to the nanopillar aspect ratio, which dictates the nanopillars’ anisotropy and thermal stability. Additionally, we show that the current density required for switching can be reduced and the device thermal stability increased by inserting Hf interlayers into the heterostructure. Micromagnetic simulations are generally consistent with the experimentally observed switching behavior, suggesting an increase in the interfacial perpendicular anisotropy at the CoFeB/MgO interface and the reduction in the Dzyaloshinskii–Moriya interaction at the W/CoFeB interface by the Hf interlayers.
- Subjects :
- Fabrication
Materials science
business.industry
Physics
QC1-999
General Engineering
Heterojunction
Aspect ratio (image)
Magnetic field
Condensed Matter::Materials Science
Optoelectronics
General Materials Science
Thermal stability
Anisotropy
business
Current density
TP248.13-248.65
Biotechnology
Nanopillar
Subjects
Details
- ISSN :
- 2166532X
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- APL Materials
- Accession number :
- edsair.doi.dedup.....598bef6f2eb239b44f02161f2fc52135