A challenge of new materials for next generation's magnetic recording

Osaka, Tetsuya; Sayama, J.

doi:10.1016/j.electacta.2006.09.005

Cited by 12 publications

(6 citation statements)

References 54 publications

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“…Cobalt and cobalt alloys are widely used in the electronics industry as the magnetic recording media due to their outstanding magnetic properties, [1][2][3] which depend strongly on the cobalt crystal structure. It is well known that cobalt has two crystal structures, the hexagonal close-packed (HCP) and face centered-cubic (FCC) structures; being the former the most stable phase.…”

mentioning

confidence: 99%

Electrochemical Synthesis of Cobalt with Different Crystal Structures from a Deep Eutectic Solvent

Manh

Arce-Estrada

Mejía-Caballero

et al. 2018

J. Electrochem. Soc.

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The present paper shows experimental evidence of electrochemically synthetizing cobalt with hexagonal and face centered cubic structures from a choline chloride-based deep eutectic solvent. The nucleation and diffusion-controlled growth mechanisms of cobalt onto a copper electrode were studied through electrochemical means in order to determine several kinetic parameters of interest such as the nucleation rate, A, and the number density of active sites, N 0 . Current density transients were analyzed using a model comprising the simultaneous presence of cobalt 3D nucleation with diffusion-controlled growth and residual water reduction on the growing surfaces of the metallic nuclei. The massive electrodeposition of cobalt was carried out on copper substrates using potentiostatic and galvanostatic techniques. The analysis of results obtained from the surface deposit microstructure and morphology using scanning electron microscopy images and magnetic measurements, confirmed the existence of the hexagonal and cubic cobalt structures. It was found that fiber textures parallel to the electrodeposition axis are formed in the case of the cobalt cubic structure. Furthermore, mainly the current density and kinetics of crystallites nucleation are considered the key parameters to favor the crystal structure change, thus formation of the texture of cobalt from DES.

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confidence: 99%

Electrochemical Synthesis of Cobalt with Different Crystal Structures from a Deep Eutectic Solvent

Manh

Arce-Estrada

Mejía-Caballero

et al. 2018

J. Electrochem. Soc.

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“…Magnetic domain images observed through the Kerr effect of Co-Ni-Fe-P soft magnetic underlayer on a disk substrate electroless-deposited (a) without and (b) with an external applied magnetic field. The thickness of each sample is 1 μm [118]…”

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confidence: 99%

30 years of electroless plating for semiconductor and polymer micro-systems

Shacham‐Diamand

Osaka

Okinaka

et al. 2015

Microelectronic Engineering

147

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Electroless deposition (ELD) is a well-known method for preparing thin films of metals and their alloys. It is a highly selective method allowing additive patterning of isolated and embedded structures on insulating substrates, e.g. glass, plastic or ceramic. It is a relatively low temperature (less than the boiling point of the electrolyte) and low cost process compared to other physical and chemical vapor deposition methods. ELD features uniform and normally conformal deposition (additives may affect its conformality) with low defect density and some unique material properties. In the last 30 years electroless plating of metals (e.g. copper, gold, nickel, cobalt, palladium, iron, silver, etc.) and their alloys, was demonstrated for micro system applications: microelectronics, micro electro mechanics, micro electro optics and microfluidics, micro fuel cells, micro batteries etc. Electroless plating was also demonstrated on nano structures, both artificial and natural. In this paper we present a short tribute to the recent advances in electroless plating in the last 30 years. Those advances and innovations are due to the work of many scientists and engineers on a time span started in the 19 th century. The progress in electroless plating followed the need and the trend for better metallization technologies for complex structures with critical dimensions that had been shrinking continuously in the last few decades.

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“…The heating rate, gentle stirring, and higher final temperature of ~180 °C were found to be effective in promoting the formation of the fct phase. The temperature of 180 °C is close to the thermal decomposition temperature of Fe(acac) 3 . In general, increasing the reaction temperature led to a loss of the acicular nanoparticle morphology and spheroidal particles were observed.…”

Section: Resultsmentioning

confidence: 90%

“…In recent years, both miniaturization and the increasing demand for high-density storage devices have driven the development of new or enhanced magnetic materials with high performance [1][2][3][4][5][6]. In this context, new technologies for data storage are currently focused on both advanced materials and media capable of achieving ultrahigh density recording values (ultrahigh magnetic recording systems (UHMR)) with a performance close to terabits/in 2 [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Perpendicularly self-oriented and shape-controlled L10-FePt nanorods directly synthesized by a temperature-modulated process

Silva

Varanda

2011

Nano Res.

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The synthesis and self-assembly of tetragonal phase-containing L1 0 -Fe 55 Pt 45 nanorods with high coercive field is described. The experimental procedure resulted in a tetragonal/cubic phase ratio close to 1 : 1 for the as-synthesized nanoparticles. Using different surfactant/solvent proportions in the process allowed control of particle morphology from nanospheres to nanowires. Monodisperse nanorods with lengths of 60 ± 5 nm and diameters of 2-3 nm were self-assembled in a perpendicular oriented array onto a substrate surface using hexadecylamine as organic spacer. Magnetic alignment and properties assigned, respectively, to the shape anisotropy and the tetragonal phase suggest that the self-assembled materials are a strong candidate to solve the problem of random magnetic alignment observed in FePt nanospheres leading to applications in ultrahigh magnetic recording (UHMR) systems capable of achieving a performance of the order of terabits/in 2 .

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A challenge of new materials for next generation's magnetic recording

Cited by 12 publications

References 54 publications

Electrochemical Synthesis of Cobalt with Different Crystal Structures from a Deep Eutectic Solvent

Electrochemical Synthesis of Cobalt with Different Crystal Structures from a Deep Eutectic Solvent

30 years of electroless plating for semiconductor and polymer micro-systems

Perpendicularly self-oriented and shape-controlled L10-FePt nanorods directly synthesized by a temperature-modulated process

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