Magnetic head having a read/write coil with a d.c. current through it for cancellation of leakage magnetic flux from erase coil

Claim 1

A magnetic head for use in a magnetic disc drive apparatus for performing read/write operations, said magnetic head comprising: a read/write head having a read/write coil with a center tap to divide said read/write coil into a first section and a second section; an amplifying circuit means for supplying a write current through said read/write coil in accordance with data to be written during a write mode, said write current including a first write current flowing through said first section and a second write current flowing through said second section, said first write current flowing alternately with said second write current and in an opposite direction; an erase head having an erase coil through which an erase current flows during said write mode for erasing on both sides of a data track written by said read/write head, said erase head causing a magnetic leakage flux in an opposite direction to a magnetic flux set up by said first write current; an erase switch circuit means provided in series with a DC voltage source and said erase coil, said erase switch circuit means being closed during said write mode for supplying said erase current and for causing a DC current therefrom to flow through said first section in the same direction as said first write current, such that said DC current generates a magnetic flux in an opposite direction to said magnetic leakage flux caused by said erase head in said read/write head, thereby cancelling out said magnetic leakage flux.