Patent ID: 8270127

Claim:
A magnetic coupling-type isolator comprising: a magnetic field generator which generates an external magnetic field in response to an input signal; and magnetoresistive effect elements which are disposed opposite to the magnetic field generator in the height direction at positions which are electrically insulated from the magnetic field generator and magnetically coupled with the magnetic field generator, to detect the external magnetic field to convert the detected external magnetic field into an electrical signal, wherein the magnetoresistive effect elements include a multilayer film and electrode layers disposed on and under the multilayer film, the multilayer film being formed by sequentially laminating an antiferromagnetic layer, a fixed magnetic layer with a magnetization direction fixed, a nonmagnetic material layer, and a free magnetic layer of which magnetization is variable, the multilayer film is formed to have a width dimension T 1 and a length dimension L 1 perpendicular to the width dimension T 1 , the length dimension L 1 being longer than the width dimension T 1 , the multilayer film is positioned within a width region of 60% in total of 30% each to a width dimension T 2 of the magnetic field generator in a direction of both sides from a center of the width dimension T 2 when seen in a plan view, and a nonmagnetic wiring pattern connected to the magnetoresistive effect element is formed continuous to the electrode layer.