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Title: Structural and magnetic properties of HCP-CoCrPt-SiO2 granular media
Authors: Xu, Y.
Ping Wang, J.
Shan, Z.S.
Jiang, H.
Su, Y.
Tow Chong, C.
Lu, L. 
Keywords: High coercivity
Magnetic recording
Thermal stability
Issue Date: 2001
Citation: Xu, Y., Ping Wang, J., Shan, Z.S., Jiang, H., Su, Y., Tow Chong, C., Lu, L. (2001). Structural and magnetic properties of HCP-CoCrPt-SiO2 granular media. Journal of Magnetism and Magnetic Materials 225 (3) : 359-372. ScholarBank@NUS Repository.
Abstract: Granular HCP-(CoCrPt)100-x(SiO2)x thin films with Cr underlayers have been fabricated by sputtering multilayers followed by post-deposition annealing. Magnetic and structural properties of the films for potential applications in magnetic recording media have been investigated in detail. In as-deposited films coercivities exceeding 2.5 kOe have been obtained with SiO2 varying from 8 to 16 vol%; high coercivity of 5.6 kOe and anisotropy of 4.6 × 106 erg/cm3 have been achieved at low Mrt value (about 0.4 memu/cm2) in the post-annealed films. VSM measurements showed that the magnetic moment lies well in the film plane under proper preparation conditions. Grain isolation in the magnetic layer was improved by segregating SiO2 into grain boundaries and further enhanced by post-deposition annealing. The rapid increase of the coercivity upon annealing is most likely due to the significant decrease in intergranular exchange coupling, as shown by the δ M measurement in which the peak value of δ M curves changed from a positive value to a negative value upon annealing. Magnetic reversal properties of the films have also been systematically studied. These results show that the HCP-CoCrPt-SiO2 granular film is a promising candidate for ultra-high-density recording media up to 100 Gbit/in2 or beyond because of its low Pt content and desirable properties. © 2001 Elsevier Science B.V.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/S0304-8853(01)00063-4
Appears in Collections:Staff Publications

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