Effect of Film Thickness on Morphology and Magnetic Properties of CoPt Thin Films
Resource
Nanoscience and Nanotechnology Letters, 3(2), 262-266
Journal
Nanoscience and Nanotechnology Letters
Pages
262-266
Date Issued
2011
Date
2011
Author(s)
Shen, C.L.
Kuo, P.C.
Lin, G.P.
Li, Y.S.
Huang, K.T.
Chen, S.C.
Abstract
The separated CoPt nano-size islands were fabricated on amorphous glass substrates in this work. The microstructures and magnetic properties of CoPt thin films with thicknesses between 1 and 20 nm after annealing at 700 °C for 30 minutes were investigated. The morphology of CoPt thin film would change from a well-distributed and discontinuous nano-size CoPt islands into a continuous film as increasing the film thickness from 1 to 20 nm. The formation mechanism of the CoPt islands may be due to the surface energy difference between the glass substrate and CoPt alloy. Each CoPt island was composed of multi-CoPt particles. This discontinuous nano-island CoPt recording film may increase the recording density and enhance the signal to noise ratio while comparing with the continuous films. The 7.5 nm-thick CoPt film revealed an out-of-plane coercivity (Hc) of 12.0 kOe and had separated islands after annealing at 700 °C for 30 minutes. This nano-size CoPt thin film may be a good candidate for ultra-high density magnetic recording media due to its discontinuous islanded nanostructure and good magnetic properties. Copyright © 2011 American Scientific Publishers.
Type
journal article
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