Abstract
Ferromagnetic resonance (FMR) was observed for Co82Pt12 films with various process. And relation between effective damping factor (αeff) and compositional modulation (CM) in the atomic layers, and other magnetic properties to investigate the relationship between local variation of the magnetic properties and the αeff. The CM was changed by the substrate temperature Tsub and deposition rate of the Co-Pt alloy film. As a result, it was found that 1) For the Tsub dependence, αeff took maximum value of 0.22 at Tsub = 200 oC. 2) For the rate dependence, aeff linearly increases with 0.12 to 0.35 with increasing deposition rate from 0.3 to 2.0 nm/sec. 3) There was no similar tendency between aeff and CM for the Co-Pt alloy film with Tsub and rate change. Thus the CM is not dominant factor of the aeff for the compositionally modulated Co-Pt alloy film.
Highlights
Experimental results regarding Microwave Assisted Magnetic Recording (MAMR) for CoPt-based granular media with high uniaxial magnetocrystalline anisotropy energy (Ku) have been reported.[1]
Relation between effective damping factor and compositional modulation (CM) in the atomic layers, and other magnetic properties to investigate the relationship between local variation of the magnetic properties and the αeff
The CM was changed by the substrate temperature T sub and deposition rate of the Co-Pt alloy film
Summary
Experimental results regarding Microwave Assisted Magnetic Recording (MAMR) for CoPt-based granular media with high uniaxial magnetocrystalline anisotropy energy (Ku) have been reported.[1]. For Co100-xPtx alloy film with CM, degree of CM causes local variation of the magnetic properties in the film, α for such films thought to be affected by degree of the CM. Effective damping factor (αeff), which is α concerning external factor, was investigated by evaluating Q-band ferromagnetic resonance (FMR) linewidth using magnetic cavity method[5,6,7] for Co100-xPtx alloy films with various atomic stacking structures
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