Article

Effect of Ag underlayer on microstructures and perpendicular magnetic properties of CoPt nanocomposite thin films.

Institute of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
Journal of Nanoscience and Nanotechnology (impact factor: 1.56). 12/2011; 11(12):11171-5.
Source: PubMed

ABSTRACT CoPt/Ag films were prepared by magnetron sputtering on glass substrates and subsequent annealing. The dependence of degree of ordering and magnetic properties on Ag film thickness and annealing conditions were investigated. It was found that the Ag underlayer played a dominant role in inducing the (001) texture of the CoPt film after annealing. CoPt films with a thickness about 20 nm and Ag underlayers with a thickness about 70 nm are easy to obtain a large degree of ordering and a perpendicular magnetic anisotropy after annealing at 700 degrees C for 30 min. CoPt/Ag films with out-of-plane coercivity (Hc (perpendicular)) in the range of 13.5-14.0 kOe and a out-of-plane squareness (S(perpendicular)) of 0.97 were obtained after annealing at 700 degrees C for 30 min. Ag underlayer is beneficial to enhance the Hc(perpendicular)and S(perpendicular) of CoPt film significantly. The degree of ordering and perpendicular magnetic properties of the CoPt films which deposited on Ag underlayer are larger than those of the single layer CoPt films.

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Keywords

Ag film thickness
 
Ag underlayer
 
Ag underlayers
 
annealing conditions
 
CoPt film
 
CoPt films
 
CoPt/Ag films
 
dominant role
 
Hc(perpendicular)and S(perpendicular)
 
large degree
 
magnetic properties
 
magnetron sputtering
 
perpendicular magnetic anisotropy
 
perpendicular magnetic properties
 
S(perpendicular)
 
single layer CoPt films
 
subsequent annealing
 
thickness
 

C L Shen