Drive circuit for a dual-element magnetic head assembly which includes an encodor, flip-flop circuit, record bit adding circuit, and record amplifier

摘要

A circuit for driving a dual-element magnetic head assembly made up of a magnetoresistive (MR) readback head and a recording head for recording and reproducing data out of a magnetic recording medium. When the head assembly ends a recording operation, the last recording magnetic field is oriented in a direction for deepening the bias to a MR element at all times. A bias electric field for the MR element is continuously applied even during recording operation. The circuit, therefore, stabilizes the bias to the MR element at the end of a recording operation, reduces noise during readback operation, and prevents the readback output from fluctuating every time a recording operation is performed.