Effect of Ag on the structure and magnetic properties of CoPt/Ag nanocomposite films

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Abstract
CoPt/Ag nanocomposite films were prepared by magnetron sputtering. The dependenc e of texture and magnetic properties on film thickness, bilayer thickness, Ag at omic fraction and annealing conditions is investigated. Films with thickness bel ow 20 nm are apt to form (001) orientation. The existence of the Ag in the film plays a dominant role in inducing the (001) texture of the film besiles suppress ing the growth of the CoPt grains during annealing. The Co40Pt43 Ag17 film after annealing at 600℃ exhibits a large perpendicul ar coercivity of HC=5.6×105 A/m, a large saturation magne tization of MS=0.65T and a squareness of s=0.95 of the hysteresis loo p.

Keywords:
magnetic recording materials /

magnetic film /

CoPt/Ag nonocomposite f ilm
Authors and contacts
Xue Shuang-Xi²,

Wang Hao²,

Yang Fu-Jun²,

Wang Jun-An²,

Cao Xin²,

Wang Han-Bin²,

Gao Yun²,

Huang Zhong-Bing²,

Feng Jie²,

Cheung W. Y.³,

Wong S. P.³,

Zhao Zi-Qiang¹

(1)北京大学重离子物理教育部重点实验室，北京 100871; (2)湖北大学物理学与电子技术学院暨纳米技术研究中心，武汉 430062; (3)香港中文大学电子工程系，香港
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