Microstructural and crystallographic aspects of thin film recording media

Abstract

Various aspects of the structure of thin film longitudinal recording media are presented and discussed. In particular we discuss the role that the various layers of thin film media play in controlling the microstructure and magnetic properties of the magnetic layer. These include the grain size of the films, the texture of the films, the role of the intermediate layer and the role of chemical segregation.

Electrodeposition of Co-Ni-MoxOy Powders: Part I. The Influence of Deposition Conditions on Powder Composition and Morphology

“…Larger grains were deposited at the 1:1 Ni 2+ /Co 2+ concentration ratio (0.1 M Ni, 0.1 M Co) with a current density of 400 mA/cm 2 (Figure 2(a)) than with a current density of 800 mA/cm 2 (Figure 2(c)). …”

“…The powder deposited from the electrolyte 0.03 M Mo (Figure 2(b)) with a current density of 800 mA/cm 2 , comprised larger grains, whereas the conditions with a current density of 400 mA/cm 2 (Figure 2(a)). This pattern shows that an increase in Mo concentration and current density cause the grain to decrease in size.…”

“…From the electrolyte that contains 0.0005 M Mo, alloy powder deposition starts at the potential of À1.07 V (Figure 1, curve 5), whereas deposition of the alloy from the electrolyte containing 0.03 M Mo starts at the potential that is 100 mV less (À1.123 V) (Figure 1, curve 3). The limiting deposition current density is 7.183 A/cm 2 …”

“…ELECTROCHEMICALLY deposited alloys of irongroup metals (Fe, Co, and Ni), in a form of powders or coatings, are important magnetic materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14] as well as good catalysts for hydrogen evolution. [15][16][17] Powders of binary and multicomponent alloys as well as single metal deposits are classified in a system defined by Brenner [18] based on the type of deposition the metals may undergo.…”

Preparation and growth mechanism of nickel nanowires under applied magnetic field

“…In addition, much attention has been focused on one-dimensional (1-D) nanostructure such as nanorods, nanowires, nanofibers and nanochains due to their potential applications in nanodevices [3][4][5]. As a typical magnetic material, 1-D metallic Ni nanomaterial in uniform morphology and high purity has become increasingly mandatory for specific applications such as microwave absorbing materials, magnetic recording media, gas sensors, drug deliveries, commercial batteries and catalysts [6][7][8][9][10][11][12]. To date, much effort has been made to prepare Ni nanomaterial with 1-D structure.…”