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Increased magnetic damping in ultrathin films of Co2FeAl with perpendicular anisotropy
- Source :
- Applied Physics Letters. 110:252409
- Publication Year :
- 2017
- Publisher :
- AIP Publishing, 2017.
-
Abstract
- We estimated the magnetic damping constant α of Co2FeAl (CFA) Heusler alloy films of different thicknesses with an MgO capping layer by means of time-resolved magneto-optical Kerr effect and ferromagnetic resonance measurements. CFA films with thicknesses of 1.2 nm and below exhibited perpendicular magnetic anisotropy arising from the presence of the interface with MgO. While α increased gradually with decreasing CFA film thickness down to 1.2 nm, it was increased substantially when the thickness was reduced further to 1.0 nm. Based on the microstructure analyses and first-principles calculations, we attributed the origin of the large α in the ultrathin CFA film primarily to the Al deficiency in the CFA layer, which caused an increase in the density of states and thereby in the scatterings of their spins.
- Subjects :
- 010302 applied physics
Materials science
Kerr effect
Physics and Astronomy (miscellaneous)
Condensed matter physics
Spins
Alloy
02 engineering and technology
engineering.material
021001 nanoscience & nanotechnology
Microstructure
complex mixtures
01 natural sciences
Ferromagnetic resonance
0103 physical sciences
Magnetic damping
Density of states
engineering
0210 nano-technology
Layer (electronics)
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 110
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........3b14fdae714093ef59baecc972b0fc5c