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Effect of Ag Underlayer on Microstructures and Perpendicular Magnetic Properties of CoPt Nanocomposite Thin Films

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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 °C for 30 min. CoPt/Ag films with out-of-plane coercivity (H c) in the range of 13.5–14.0 kOe and a out-of-plane squareness (S) of 0.97 were obtained after annealing at 700 °C for 30 min. Ag underlayer is beneficial to enhance the H c and S 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.

Keywords: AG UNDERLAYER; COPT FILM; DEGREE OF ORDERING; PERPENDICULAR MAGNETIC ANISOTROPY

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2011.4044

Publication date: 2011-12-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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