公开(公告)号：CA700050A

公开(公告)日：1964-12-15

申请号：CA700050D

Applicant: IBM

Inventor： KORETZKY HERMANN ,  LELAND BERNARD

公开(公告)号：DE1496852A1

公开(公告)日：1969-06-04

申请号：DE1496852

申请日：1966-12-22

Applicant: IBM

Inventor： KORETZKY HERMANN

IPC: C25D3/56 ,  H01F10/14 ,  H01F41/26

Abstract: 1,166,499. Electrolytic production of magnetic films. INTERNATIONAL BUSINESS MACHINES CORP. Dec.20, 1966 [Dec.23, 1965], No.57076/66. Heading C7B. A thin magnetic film is electro-deposited from an electrolyte comprising 40-115 g/I nickel, 0À2-2 g/l iron, up to 6 g/l cobalt, up to 0À2 g/l palladium and a thickening agent in a proportion of not more than 100 g/l, e.g. a water-soluble copolymer of methyl vinyl ether and maleic anhydride or hydroxypropyl carboxymethyl cellulose (the latter present up to 50 g/I only), and having a pH of 2À4-3. The nickel ion concentration to ferrous ion concentration in the electrolyte is preferably in the range 20:1 to 100:1. The temperature of the bath may be 21-28‹ C. and a voltage of 0À9-1À2 volts may be used. The bath may also contain boric acid, saccharin and sodium lauryl sulphate. The resultant film may be an alloy of nickel, iron, cobalt and palladium. The plating apparatus shown includes an anode of platinized tantalum and a cathode 2 of beryllium-copper formed of elliptical portions 12 connected by neck portions 14, the finished portions 12 forming a storage or switching unit for the retention of data.