MAGNETO-RESISTANCE EFFECT TYPE MAGNETIC HEAD DEVICE

摘要

PURPOSE:To improve the rectilinearity and to increase a dynamic range by extracting a signal output corresponding to a signal magnetic field out of the output of a magneto-resistance effect type magnetism-sensitive part and applying a negative feedback magnetic field corresponding to said signal output to said magnetism-sensitive part to produce a negative feedback magnetic field. CONSTITUTION:The signal output given from an LPF21 is supplied to a buffer amplifier 23, and a current iFB is flowed to a bias conductor 3 from the amplifier 23. Thus the conductor 3 produces a negative feedback magnetic field HFB and gives it to an MR magnetism-sensitive part 5. As a result, the rectilinearity is improved more and the distortions are reduced less. This reduces the Barkhausen noises and increases a dynamic range. Thus the variance of output can be reduced.