Electroless-deposited soft magnetic underlayer on silicon disk substrate for double-layered perpendicular magnetic recording media

Osaka, Tetsuya; Asahi, Toru; Yokoshima, Tokihiko; Kawaji, Jun

doi:10.1016/j.jmmm.2004.10.086

Cited by 18 publications

(20 citation statements)

References 9 publications

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“…10 The EMIC systems can be divided into chloride system and bromide system, and the latter designated as EMIB molten salt system. As for EMIC system, Zhu et al 11 investigated the electrodeposited Cu-Al alloy by using pulse current, superimposed-pulse current and reverse-pulse current methods in the 60% (mol) AlCl 3 13 Chen et al 14 investigated the electrodeposited Cu and Cu-Zn alloy at tungsten and platinum electrodes in Lewis acidic ZnCl 2 -EMIC, and pure copper could be obtained by controlling the deposition potential. For the bromides system, Iwagishi et al 15 investigated the electrodeposition of Zn in 70% EMIB-30% ZnBr 2 ionic liquid.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Cobalt in an Ionic Liquid Electrolyte at Ambient Temperature

Liu¹,

Yang

Chen

et al. 2008

Chin. J. Chem.

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The codeposition behavior of Co and Zn in an ionic liquid was investigated. In the cyclic voltammogram of a ZnCl 2 -EMIC-CoCl 2 ionic liquid, three reduction peaks appeared at 250 mV (peak c 1 ), 50 mV (peak c 2 ) and -200 mV (peak c 3 ) (vs. Zn 2＋ /Zn). According to the component analysis by means of EDS (energy disperse spectroscopy), peaks c 1 , c 2 and c 3 correspond to the electrodeposition of Co, the underpotential deposition of Zn on the electrodeposited Co coating and the codeposition of Co-Zn alloy, respectively. The potentiostatic deposition showed that the electrodeposited coating of high-pure Co was obtained when the cathodic potential was controlled at 100 mV (vs. Zn/Zn 2＋ ). The electrodeposition was carried out at a galvanostatic mode, and when the current density was controlled at about 85 µA/cm 2 , the electrodeposited coating of high-pure Co was also obtained. Studies on the mechanism of codeposition of Co and Zn showed that the electrodeposition process of Co and the underpotential deposition process of Zn on the electrodeposited Co coating were all diffusion controlled.

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Section: Introductionmentioning

confidence: 99%

Electrodeposition of Cobalt in an Ionic Liquid Electrolyte at Ambient Temperature

Liu¹,

Yang

Chen

et al. 2008

Chin. J. Chem.

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“…A detailed description of SUL preparation was given elsewhere [5]. For the uniformity of film thickness, the bath was agitated by a rotating substrate method with rotation speed, about 40 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, an appearance of distinct macroscopic magnetic domain boundaries (MMDB) in the SUL caused a crucial issue that 'spike noise' occurred in the read-write experiment [4][5][6]. We found that the film thickness [6] and H application during the deposition [5] were greatly associated with the ap-…”

Section: Introductionmentioning

confidence: 91%

“…Since electroless deposition technique enables us to fabricate the SUL with a uniform thickness of several hundred nanometers on a disk scale, it is sufficiently suitable method for the SUL [3][4][5][6]. Our group has successfully found appropriate electroless deposition parameters, such as a film thickness, an agitation rate and an applied external magnetic field H during the deposition, to improve the soft magnetic and read-write properties of the CoNiFe SULs [4][5][6]. Nevertheless, an appearance of distinct macroscopic magnetic domain boundaries (MMDB) in the SUL caused a crucial issue that 'spike noise' occurred in the read-write experiment [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Our group has successfully found appropriate electroless deposition parameters, such as a film thickness, an agitation rate and an applied external magnetic field H during the deposition, to improve the soft magnetic and read-write properties of the CoNiFe SULs [4][5][6]. Nevertheless, an appearance of distinct macroscopic magnetic domain boundaries (MMDB) in the SUL caused a crucial issue that 'spike noise' occurred in the read-write experiment [4][5][6]. We found that the film thickness [6] and H application during the deposition [5] were greatly associated with the ap-…”

Section: Introductionmentioning

confidence: 99%

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Soft X‐ray absorption spectroscopy and magnetic circular dichroism study of electroless‐deposited CoNiFe ternary alloy soft magnetic films

Tanaka

Nakamura

Asahi

et al. 2006

Phys. Status Solidi (c)

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We studied microscopic magnetic properties of each consistent atom in boron added CoNiFe electrolessdeposited soft magnetic films, which is a promising candidate for the soft magnetic underlayer of the perpendicular magnetic recording medium, by X-ray absorption spectra (XAS) and magnetic circular dichroism (MCD) measurement. It was found that various monoxides and Fe sesquioxide coexisted with the metals at the upper part of the films. The results of MCD sum rule showed the expected values of orbital angular moment for the film with macroscopic magnetic domain boundaries were larger than those of without domains at Co and Ni atoms and smaller at Fe atom. The appearance of macroscopic magnetic domain boundaries probably originated from the increase in of Co and/or Ni atoms.

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Electrochemical Synthesis of Metal Alloys for Magnetic Recording Systems

Sugiyama

Yoshino

Hachisu

et al. 2010

Modern Electroplating

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Electroless-deposited soft magnetic underlayer on silicon disk substrate for double-layered perpendicular magnetic recording media

Cited by 18 publications

References 9 publications

Electrodeposition of Cobalt in an Ionic Liquid Electrolyte at Ambient Temperature

Electrodeposition of Cobalt in an Ionic Liquid Electrolyte at Ambient Temperature

Soft X‐ray absorption spectroscopy and magnetic circular dichroism study of electroless‐deposited CoNiFe ternary alloy soft magnetic films

Electrochemical Synthesis of Metal Alloys for Magnetic Recording Systems

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