A Study on Electroless Plating of Cobalt Alloy Films for Perpendicular Recording

Abstract

An electroless plating bath for the preparation of perpendicular recording media was developed. It was found that the hcp structure of Co-P is oriented normal to the film plane with the Mn codeposition into the films. First, an ammoniacal malonate-malate bath, containing MnSO4, was selected. Nickel was codeposited into the films in order to decrease the saturation magnetization, Ms, since low Ms is necessary to decrease the demagnetizing field. Second, effects were investigated for three factors (i.e., MnSO4 concentration, bath p H, and NiSO4 concentration) causing the c-axis perpendicular orientation of the film properties. Optimum plating conditions for perpendicular recording media were thus determined. * Electrochemical Society Active Member. ABSTRACTThe effect of adenine, guanine, saccharin, and coumarin on electroless copper deposition has been studied by cyclic voltammetry and the weight gain method. It was found that guanine and adenine accelerate electroless copper deposition. Coumarin and saccharin have almost no effect on the deposition process. Differences in the effect of these two groups of additives have been correlated to differences in the electronic structure of molecules. * Electrochemical Society Active Member.is important in order to understand passivation phenomena in electroless copper deposition. ExperimentalGravimetric experiments.--Experiments were carried out in a glass beaker placed in a constant temperature bath regulated at 25~ (-----0.5). Approximately 500 ml of the electroless copper solution was used with the stainless steel plate sample of 30 cm 2' area. The steel plate samples were activated in PdC12 prior to immersion into the plating solution in order to avoid effects of the variable induction time (13). DUring plating, argon was passed above the solution. After 30 min of deposition, the steel plate was taken out of the solution, dried, and the amount of the deposited copper was determined by weighing.Electrochemical experiments.--The solutions were prepared with analytical grade reagents and deionized water. The electroless copper bath used for these ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-03-17 to IP

Progress of electroless amorphous and nano alloy deposition: a review – Part 2

“…Hyashi 220 summarised the electroless quaternary alloy deposits to 1991. Osaka et al 221,222 prepared electroless Co-Ni-Mn-P deposits, used for perpendicular recording media and also 223 Co-Ni-Re-P. Zhang and coworkers investigated systematically the preparation and properties of electroless Ni-Cu-Sn-P alloys. 224,225 Only one paper on electroless quintuple alloy deposits was found during this period, on Co-Ni-Mn-Re-P. 226 The aim was to improve the performance of perpendicular magnetic media.…”

Influence of Nickel Layer on Electromagnetic Interference Shielding Effectiveness of CuS‐Polyacrylonitrile Fibers

“…Metals which can be used to form layers via electroless plating include nickel, copper, silver, cobalt, and several alloys . As nickel is very hard and its friction factor is small, it forms a highly wear resistant coating and is also cheaper and more conductive than other metals …”

“…28 Metals which can be used to form layers via electroless plating include nickel, copper, silver, cobalt, and several alloys. [29][30][31][32] As nickel is very hard and its friction factor is small, it forms a highly wear resistant coating and is also cheaper and more conductive than other metals. 33 Copper sulfide-polyacrylonitrile (CuS-PAN) fibers have various advantages such as electrical conductivity, chemical resistance, friction resistance, antibiosis, and EMI shielding effectiveness (SE).…”

CORRELATION BETWEEN FILM COMPOSITION AND MAGNETIC PROPERTIES OF ELECTROLESS-PLATED CoNiP PERPENDICULAR MAGNETIC RECORDING MEDIA

“…The authors have successively studied Co-alloy perpendicular magnetic recording media prepared by the electroless-plating method [ 1,2]. Recently, we developed electroless-plated CoNiP ternary alloy films for perpendicular magnetic recording media [3].…”