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公开(公告)号：DE2616145A1
公开(公告)日：1976-11-11
申请号：DE2616145
申请日：1976-04-13
Applicant: IBM
Inventor： PLANTE FRANKLIN THEODORE , SANKUER RAYMOND FREDERICK
Abstract: 1532515 Producing Co-P particles INTERNATIONAL BUSINESS MACHINES CORP 24 March 1976 [30 April 1975] 11809/76 Heading C7D Finely divided amorphous magnetic Co-P alloy particles of up to 300A diameter with average size of about 150A are produced by an oxidation reduction reaction. The reaction is carried out in a solution comprising a salt promoting reducible cobalt cations, a salt providing hydroxyl ions as a reducing agent, a non complexing base providing OH anions and a source of reducible palladium cations. The solution is maintained at 15 to 35C and excludes cobalt cation complexing agents and is not subject to external magnetic fields. The coercivity of the resultant Co-P particles is dependent on the palladium ion concentration in the solution and the particles may be incorporated in a polyurethane binder to form a magnetic recording medium.
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公开(公告)号：DE2503772A1
公开(公告)日：1975-09-18
申请号：DE2503772
申请日：1975-01-30
Applicant: IBM
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