| 摘要 |
PURPOSE:To maintain a magneto-resistance effecting element at the most suitable bias point with less bias magnetic fields by supplying a current in opposite directions to a bias conductor and the magneto-resistance effecting element with each other. CONSTITUTION:The distance between an MR element and shielding magnetic substances 5 and 6 is set so as to satisfy a relation g1<g2 and the current IS of the MR element 1 and the current IB of a bias conductor 2 are made to flow in opposite directions with each other. The bias current IB generates a bias magnetic field A in the MR element 1. Moreover, the 1st shielding magnetic substance 5 and 2nd shielding magnetic substance 6 are magnetized so that their parts facing to a recording medium become N-pole by the currents IS and IB, respectively, and another bias magnetic field B is generated. On the contrary, the magnetic fields in the opposite direction which are formed in the shielding magnetic substance 6 by the current IS and in the shielding magnetic substance 5 by the bias current IB excerts little influences, because the distance between the location of the current and the magnetic substances is large. |
