Magnetic particles and method of production thereof

Details Magnetic particles and method of production thereof Magnetic particles and method of production thereof

G - Physics

11

B

31/149, 23/267

G11B 5/714 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1246321

- 38 - Abstract of the Disclosure: MAGNETIC PARTICLES AND METHOD OF PRODUCTION THEREOF Magnetic particles, particularly magnetic iron oxide particles, magnetic cobalt-containing iron oxide particles and magnetic metallic iron particles, which have a long axis diameter of 300 nm or less, an axial ratio of 5 or less, and a specific surface area of 40 m2/g (measured by BET method), and are useful as a recording element for a magnetic recording medium, and a method for the production thereof, which com- prises reacting an aqueous solution containing tri- valent iron ion with an equivalent or more amount of an aqueous alkali solution at a temperature of 30°C or lower, aging the produced ferric hydroxide, sub- jecting the ferric hydroxide to hydrothermal reaction in an autoclave to produce .alpha.-ferric oxyhydroxide par- ticles, filtering and drying the particles, and then reducing the particles with heating and optionally further oxidizing them, and also a magnetic recording medium prepared from the magnetic particles.

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