In {HEAD ~ improved cobalt coated magnetic iron oxide} having increased coercive field strength and highly efficient for {TAIL ~ use} in 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 
efficient for
In { HEAD ~ improved cobalt coated magnetic iron oxide } having increased coercive field strength and highly efficient for { TAIL ~ use } in 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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