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Preparation of Magnetic Particles

IP.com Disclosure Number: IPCOM000093411D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Judy, JH: AUTHOR [+2]

Abstract

Fine magnetic particles are produced by DC sputtering onto mercury. In order to avoid the inherent dangers of mercury vapor, the mercury is cooled to a temperature of the order of 1100 degrees C, although it can be varied up to about 75 degrees C. DC sputtering is carried out in an inert atmosphere, such as argon, at pressures on the order of 10 to 100 microns of Hg. The size of particles thus formed is controlled by the sputtering rate and temperature of the mercury substrate. By varying these parameters, particles ranging in size from 5 angstroms to 1, 000 angstroms are obtained. After formation, the particles are easily separated from the mercury by an external magnet. Magnetic metal particles which can be produced by this technique include cobalt, nickel and iron.

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Preparation of Magnetic Particles

Fine magnetic particles are produced by DC sputtering onto mercury. In order to avoid the inherent dangers of mercury vapor, the mercury is cooled to a temperature of the order of 1100 degrees C, although it can be varied up to about 75 degrees C. DC sputtering is carried out in an inert atmosphere, such as argon, at pressures on the order of 10 to 100 microns of Hg. The size of particles thus formed is controlled by the sputtering rate and temperature of the mercury substrate. By varying these parameters, particles ranging in size from 5 angstroms to 1, 000 angstroms are obtained. After formation, the particles are easily separated from the mercury by an external magnet. Magnetic metal particles which can be produced by this technique include cobalt, nickel and iron. Magnetic alloys which can be produced by this technique include cobalt-iron, cobalt-nickel, and nickel-iron. In addition, magnetic alloys such as cobalt- phosphorus, produced by plating techniques, can be sputtered to form fine magnetic particles.

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