Magnetic thin films for high-density recording

“…Also, metal nanoparticles, exhibiting novel characteristics ascribed to the extremely small dimensions, have received sufficient interest (Petit et al 1999;Link and Wang 2000;Lu et al 2000). Unusual properties of the nanometric metals that are often superior to those of their larger counterparts resulted in attractive application prospects in many technological areas such as electronics, catalysis, chemical sensors, electromagnetic devices, magnetic data storage, biological and structural applications (Lodder 1996;Sellmyer et al 1999;Moreno-Manas and Pleixates 2003;Tartaj et al 2003). Investigations have indicated that when a metal is associated with another metal in bimetallic or alloy form, the properties of resulting material could be enhanced with respect to those of the pure metals (Bautista et al 1996;Li et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

et al. 2013

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In the present article, various nanometric Fe 50 Ni 50 alloys were synthesized by chemical reduction of the corresponding metal ions, with hydrazine in an aqueous solution. Process variables of reaction temperature, pH of the hydrazine solution and concentration of metal ions were varied in order to determine the optimum synthesis conditions regarding quality, productivity and cost. It is found that pH of hydrazine solution, at low concentration of metal ions, is the most crucial variable affecting the reaction rate, average crystallite and particle sizes of the synthesized nanometric Fe 50 Ni 50 alloy, followed by the total concentration of metal ions. Thus, increase of pH of hydrazine solution acts as an efficient stabilizer in reducing the particle size. On the contrary, at high concentration of metal ions, the structural characteristics of the nanometric Fe 50 Ni 50 alloy are almost insensitive to reaction temperature and pH of hydrazine solution, but the reduction rate is remarkably sensitive to reaction temperature. Based on these results, it is decided that a reaction temperature of 80 • C, pH of the hydrazine solution of 12•5 and concentration of metal ions of 0•6 M represent the optimum synthesis conditions. The role of pH of hydrazine solution in reducing the alloy's average particle size as well as efficient stabilizer confirms tremendous effect of synthesis conditions on the alloy structure and therefore, the importance of this study for industrial production of nanometric Fe 50 Ni 50 alloy.

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“…35 An important aspect of this approach is that the interlayer thickness should be thick enough to interrupt the exchange interaction between the magnetic layers but it should be, at the same time, thin enough to retain magneto-static coupling. This is the medium that is most likely to replace the present Co-Cr alloy media in the recent future because of its compatibility with the present disk drive system.…”

Section: Magnetic Multilayered Disksmentioning

confidence: 99%

Patterned nanostructured arrays for high‐density magnetic recording

Tofail

Rahman

2001

Applied Organom Chemis

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This article reviews the recent advances in patterned magnetic nanostructures for application in high-density recording. In this connection we discuss: (1) the fundamental limits of magnetic recording on conventional magnetic disks and the need for newer materials; (2) the state-of-the art technology for creating arrays of magnetic nanostructures; and (3) prospects and problems of high-or ultrahigh-density recording using these nanostructured arrays.

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Magnetic thin films for high-density recording

Cited by 9 publications

References 33 publications

Micromagnetic modelling and magnetization processes

Micromagnetic modelling and magnetization processes

Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

Patterned nanostructured arrays for high‐density magnetic recording

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