CoPt/C nanogranular magnetic thin film

被引:2
|
作者
Li, T [1 ]
Yan, H
Wang, H
Zheng, W
机构
[1] Beijing Univ Technol, Lab Thin Film Mat, Beijing 100022, Peoples R China
[2] CSIC, Lab Fis Sistemas Pequenos & Nanotenol, E-28006 Madrid, Spain
[3] Capital Normal Univ, Dept Phys, Beijing 100037, Peoples R China
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2005年 / 19卷 / 14期
关键词
nanogranular film; magnetic anisotropy; coercivity; exchange interaction;
D O I
10.1142/S0217979205029687
中图分类号
O59 [应用物理学];
学科分类号
摘要
Granular Co30Pt70/C and Co45Pt55/C films, consisting of nanopaxticle CoPt phases embedded in a carbon matrix, have been made by co-sputtering from CoPt and C targets using a tandem deposition mode. X-ray diffraction shows the existence of hard CoPt phase embedded in an amorphous C matrix after annealing. The coercivities for CoPt/C are strongly dependent on C and Pt composition. Films with coercivity of up to 5.4 kOe and grain size of 7 nm can be obtained. The development of shoulder in hysteresis loop may be contributed to the co-existence of magnetic Soft COPt3 and hard CoPt phases and the magnetic interactions between them. High remanence M-T/M-8 (> 0.8) found in our samples indicates the presence of the intergranular interactions in the samples. Observed positive contributions of delta m also give evidence of the existence of exchange interaction. High coercivity and large M-T/M-8 make granular CoPt/C film with magnetic nanoparticles very attractive for next-generation high-density recording.
引用
收藏
页码:2261 / 2271
页数:11
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