Increase of the resistivity of electroless-deposited high-B/sub s/ CoNiFeB thin films

Sobue, Masahisa; Segawa, T.; Yokoshima, Tokihiko; Osaka, Tetsuya; Kaneko, D.; Tanaka, Atsushi

doi:10.1109/tmag.2002.802676

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…In particular, the CoNiFeB film has good magnetic properties and is suitable for use in a magnetic recording head. Electroless CoNiFeB films with high resistivity were also reported [68]. It is suggested that the inclusion of impurities such as carbon can result in an increase in resistivity.…”

Section: High-performance Soft Magnetic Alloy Films Prepared By Electmentioning

confidence: 90%

Magnetic Heads

Yokoshima

2009

Nanostructure Science and Technology

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Figure 6.1 shows how rapidly the areal density of hard disk drives (HDD) has been increasing over the past 20 years [1]. Several critical innovations were necessary to bring about such rapid progress in the field of magnetic recording [2]. One of the most significant innovations from the viewpoint of material improvement was the electrodeposition of permalloy (Ni 80 Fe 20 ), which was introduced by IBM in 1979 as the core material of a thin-film inductive head to increase the magnetic recording density [3]. After the introduction of the magneto-resistive (MR) element as the read head and the electrodeposited permalloy as the write head by IBM in 1991 [4], the rate of increase in the recording density of HDDs jumped from 30% per year to 60% per year. Recently, a giant magneto-resistive (GMR) element has been used for the read element instead of the MR element. The rate of increase in the recording density jumped to over 100% per year in 1999, which is an incredible rate of increase. Since 2002, however, the rate of increase has decreased to 30%; thus, new innovations are required to maintain the rate of increase. In 2004, the practical use of perpendicular magnetic recording instead of longitudinal magnetic recording was announced [5]. This system is a critical innovation for developing high-performance HDD systems with high-recording density. The design of the magnetic recording head was changed because of the change of the recording system.The development of a new magnetic recording head with higher performance and smaller dimensions is a key requirement for realizing high-density magnetic recording. Furthermore, to meet the demand for the rapid increase in magnetic recording density, the soft magnetic film in the core must have low magnetostriction, l s , high electrical resistivity, r, high thermal stability, low film stress, and high corrosion resistance, as well as high saturation magnetic flux density, B s . The recording heads, using higher magnetic materials with high value of B s can write to a high-H c

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Section: High-performance Soft Magnetic Alloy Films Prepared By Electmentioning

confidence: 90%

Magnetic Heads

Yokoshima

2009

Nanostructure Science and Technology

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“…Iron-based alloy possesses highly saturated magnetization and outstanding soft magnetism [5][6][7][8][9] . However, low reducing rate of iron in the process of electrolessness just 1% gives rise to low deposition rate, and thus is rarely used to initiate the iron.…”

Section: Introductionmentioning

confidence: 99%

The linear regression method for improving magnetic parameter of the electroless CoFeB films

Liu

Shen

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The kinetics equation of deposition rate was implemented to help explain some of the mechanisms responsible for structures observed during the deposition of CoFeB films on poly-ester plastic. The plating rate of electroless CoFeB fi lms is a function of concentration of sodium tetrahydroborate, pH of the plating bath, plating temperature and the metallic ratio. The estimated regression coeffi cient , confi dence interval, residual error and confi dence interval were confi rmed by computer program. The optimal composition of the plating bath was obtained and the dynamic electromagnetic parameters of fi lms were measured in the 2-10 GHz range. At 2 GHz, the permeability, magnetic loss of the electroless CoFeB films were 304 ,76.6 respectively as the concentration of reducer is 1 g•L 1 .

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