CoPt patterned media in anodized aluminum oxide templates

Abstract

Patterned recording media consisting of a vertically aligned array of L10 phase CoPt nanowires embedded in a thin anodized aluminum oxide (AAO) template on silicon has been prepared. A sputter deposited thin film of aluminum on silicon was anodized and a CoPt magnetic alloy was electrodeposited into the pores of the AAO. The vertically aligned arrays of CoPt nanowires were about ∼100nm tall with ∼20nm average diameter. Since the CoPt nanowire array is laterally constrained by the surrounding AAO, the nanowire diameter is maintained without coarsening during the L10 phase conversion heat treatment at 700°C. After annealing and conversion to the L10 phase, the ∼20nm CoPt nanowires exhibit a large coercivity of ∼8kOe measured in the in-plane and perpendicular directions.

Perpendicular Magnetic Recording Medium for a Density Beyond 1 Tera Bit/inch2

“…A column-like dot array has been realized by a self-organized chemical synthesis method for Fe-Pt nanometer-scale particles [20,21]. This type can also be fabricated by an electro-deposition method in the hole of the anodic oxidized layer of Al [22]. The size of the alumite hole can be easily controlled by the conditions of anodic oxidation [23].…”

Microstructural and magnetic properties of CoPt nanowires

“…However, the FePt/CoPt nanowires made by electrodeposition were rarely studied due to the technical difficulties involved in controlling the structure/microstructure and the magnetic properties [5,6]. CoPt nanowires with preferred orientation [1,[10][11][12] have been obtained by Chu et al [10] through epitaxial electrodeposition. Also Yasi et al [13] could control their c-axis orientation by growing these nanowires over MgO and using a Pt under layer.…”

Enhanced coercivity of HCP Co–Pt alloy thin films on a glass substrate at room temperature for patterned media

“…Patterned films [1][2][3][4] and heat assisted magnetic recording (HAMR) [5][6][7][8] media present viable solutions for ultrahigh density magnetic recording beyond 10 Tb/in 2 . Of the two, patterned films are more suitable due to their smaller device volume, no requirement for a laser head for heating the magnetic film, no grain growth, and no thermal fatigue during repeated annealing processes.…”