Back to Search
Start Over
Highly dose dependent damping-like spin–orbit torque efficiency in O-implanted Pt.
- Source :
- Applied Physics Letters; 2021, Vol. 118 Issue 25, p1-5, 5p
- Publication Year :
- 2021
-
Abstract
- Damping-like torque (DLT) arising from the spin Hall effect (SHE) in heavy metals and their alloys has been widely explored for applications in spin–orbit torque MRAM, auto-oscillations, spin waves, and domain wall motion. In conventional materials, the DLT efficiency is limited by intrinsic properties, while attaining strong spin–orbit coupling and higher spin-charge interconversion, with no compromise to electric properties, is the need of the hour. In this Letter, we report more than 3.5 times increase in DLT efficiency, θ<subscript>DL</subscript>, of modified Pt-oxide by employing a better approach of low energy 20 keV O<superscript>+</superscript> ion implantation. The highest fluence of O<superscript>+</superscript> implantation (1 × 10<superscript>17</superscript> ions cm<superscript>−2</superscript>) in Pt enhanced the DLT efficiency from 0.064 to 0.230 and improved the spin transmission for a smaller trade-off in the longitudinal resistivity ( ρ Pt to ρ Pt − Oxide) from 55.4 to 159.5 μΩ cm, respectively. The transverse spin Hall resistivity, ρ SH , is found to be proportional to the square of the longitudinal resistivity, i.e., ρ SH imp ∝ ρ imp 2 , implying that the enhanced SHE in O-implanted Pt is due to a side-jumping mechanism. Further, no break in the twofold as well as mirror symmetry of torques from the O-implanted Pt allows the use of spin-torque ferromagnetic resonance-based line shape analysis to quantify such torques. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 118
- Issue :
- 25
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 151080800
- Full Text :
- https://doi.org/10.1063/5.0054779