MAGNETIC RECORDING REPRODUCTION SYSTEM EMPLOYING A VARIABLE RELUCTANCE GAP SHUNT

摘要

As depicted in the figure, the present invention comprises a transducer (20), having a permeable core (22) and a conducting coil (23), and a magnetic disk (21). Bias current in coil (23) drives a magnetic flux through magnetic circuit path (24). Air gap (25), having the lowest permeability in circuit path (24), provides the greatest reluctance to the flow of the magnetic flux. Magnetic disk (21) comprises a recording layer (29), a non magnetic exchange breaking layer (30), and a highly permeable shunt layer (31). The critical region in the present invention is variable reluctance gap shunt (34). The alternating magnetization levels in disk (21) change the reluctance of shunt (34), thereby modulating the bias flux in core (22) in transducer (20). This flux change allows for increased data storage density and data rates.