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STRUCTURE-PROPERTIES RELATIONSHIPS IN ELECTRODEPOSITED Ni-W THIN FILMS WITH COLUMNAR NANOCRYSTALLITES

N. Sulianu1,* , F. Brînzã1

Affiliation

  1. Department of Solid State Physics, Faculty of Physics, “Al. I. Cuza” University, 6600 Iasi, Romania

Abstract

Ni-W thin films with columnar nanocrystallites have been prepared by electrodeposition. Samples containing from zero to 18 wt. % W and 140 nm in thickness have been selected for measurements. Perpendicular magnetic anisotropy (PMA) was clearly observed in films with tungsten content of about 13 wt. %. Typical films of this composition consisted of columnar nanocrystallites of about 12.5 nm size in diameter embedded in an amorphous Ni-W matrix. This segregated mixed structure, i.e., two-phase heterogeneous alloy film, resulted in the large PMA energy constant K^ of 120 kJ/m3 and in the high perpendicular coercivity Hc^ of 120 kA/m. Also, these two-phase Ni-W thin films exhibited sufficiently high saturation magnetization Ms of 420 kA/m. It is concluded that electrodeposited Ni-W typical thin film (13 wt. % W) may be applicable for the media in the perpendicular magnetic recording system..

Keywords

Nickel-tungsten alloy, Electrodeposition, Nanocrystalline thin films, Coercivity, Perpendicular magnetic anisotropy.

Submitted at: Jan. 27, 2003
Accepted at: May 8, 2003

Citation

N. Sulianu, F. Brînzã, STRUCTURE-PROPERTIES RELATIONSHIPS IN ELECTRODEPOSITED Ni-W THIN FILMS WITH COLUMNAR NANOCRYSTALLITES, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 2, pp. 421-427 (2003)