MAGNETIC COUPLING-TYPE ISOLATOR

摘要

Provided is a magnetic coupling-type isolator which is excellent in fast responsiveness in particular. The magnetic coupling-type isolator is provided with a coil for generating an external magnetic field by means of an input signal, and magnetoresistance effect elements (R1 to R4) which are electrically insulated from the coil and are arranged in the position in which magnetic coupling is possible so as to detect the external magnetic field for conversion into an electrical signal.  The magnetoresistance effect elements comprise a multilayer film (31) in which an anti-ferromagnetic layer (32), a fixed magnetic layer (33), the magnetization direction of which is fixed, an insulating barrier layer (34), and a free magnetic layer (35)of which the magnetization is variable are laminated in the named order, and electrode layers (30, 40) for passing the current through the multilayer film (31).  Hard bias layers (38, 38) for supplying a bias magnetic field (bias) to the free magnetic layer (35) are arranged on both sides of the multilayer film (31).