In magnetic recording tape, the smallest ferric oxide particle that can be considered as a separate magnet. Defined as molecules of ferric oxide, or, less than one billionth of a gram of material. See Barkhausen effect.
In magnetic recording tape, the smallest ferric oxide particle that can be considered as a separate magnet. Defined as molecules of ferric oxide, or, less than one billionth of a gram of material. See Barkhausen effect.