In improved cobalt coated magnetic iron oxide having increased coercive field strength and highly efficient for {HEAD ~ use} in {TAIL ~ magnetic recording devices} and processes is produced by subjecting uncoated magnetic iron oxide particles to an acid treatment and then epitaxially coating the treated particles with cobalt 
In improved cobalt coated magnetic iron oxide having increased coercive field strength and highly efficient for { HEAD ~ use } in { TAIL ~ magnetic recording devices } and processes is produced by subjecting uncoated magnetic iron oxide particles to an acid treatment and then epitaxially coating the treated particles with cobalt
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