| 摘要 |
PURPOSE:To reduce Barkhausen noise by piling up multiple magneto-resistance effect films with nonmagnetic insulating layers in between and plural blocks of the multiple magneto-resistance effect films with insulating layers in between, with each block being constituted of a pair of magneto-resistance effect films connected in series by making detecting currents to flow in opposite directions. CONSTITUTION:Multiple magneto-resistance effect films 1 of 'Permalloy(R)', etc., are piled up with nonmagnetic insulating layers 11 and 12 of SiO2, etc., in between and each magneto-resistance effect films block A 9 is constituted of a pair of the films 1. Then detecting currents 13 are made to flow to the films of each block in the opposite directions from a constant-current power source. In addition, similar blocks B 10 are constituted and the blocks A and B 9 and 10 are alternately piled up with insulating layers 12 in between and wiring is made between the blocks A and B 9 and 10 so that the detecting currents can flow serially between the blocks A and B 9 and 10. Since bias magnetic fields 14 produced by the detecting currents received from adjacent effective films 1 are applied in the same direction in the same block and in the opposite direction between blocks, signal magnetic fields from a recording medium 5 can be reproduced with high sensitivity when the voltage thus produced is detected with a differential amplifier 6. |
