Acicular ferromagnetic metal particles and method for...

Details Acicular ferromagnetic metal particles and method for... Acicular ferromagnetic metal particles and method for...

H - Electricity

01

F

31/136

H01F 1/06 (2006.01) B22F 9/22 (2006.01)

Patent

CA 1085604

ACICULAR FERROMAGNETIC METAL PARTICLES AND METHOD FOR PREPARATION OF THE SAME Abstract of the Disclosure The specification discloses acicular ferromag- netic metal particles having a particle size of 0.1 to 1 µm and a crystallite-size, of not more than about 215 .ANG. in the effective thickness of the crystallite in the direction per- pendicular to the reflecting plane (110). These particles have a high coercive force of preferably not less than 1,400 oersteds and are useful for the preparation of high- density magnetic recording tapes, video mother tapes, and permanent magnet materials The particles are formed by reducing with heating goethite particles which are prepared by treating a ferrous salt with a large amount of a basic agent, particularly an alkali metal hydroxide.

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