Detecting method, detection device and detection kit

A detection device for detecting a magnetic particle in a sample solution, the device comprising:na magnetoresistive effect film including a first magnetic film with a fixed magnetization direction and a second magnetic film serving as a perpendicularly magnetized film with a magnetization direction variable at the detection of the magnetic particle; anda fixation layer for fixing the magnetic particle arranged on a surface of the second magnetic film,wherein all of the surface of the second magnetic film is set within a circle having a radius of 21/2d, where d represents a distance between the surface of the second magnetic film and a center of the magnetic particle, when the magnetic particle is fixed to the magnetoresistive effect film through the fixation layer,a direction of an external magnetic field for magnetizing the magnetic particle is parallel to a magnetization direction of the second magnetic film, andall of the second magnetic film is arranged in a region in which a stray magnetic field in the same direction as the external magnetic field is applied.

A detection device for detecting a magnetic particle in a sample solution, the device comprising:na magnetoresistive effect film including a first magnetic film with a fixed magnetization direction and a second magnetic film serving as an in-plane magnetized film with a magnetization direction variable at the detection of the magnetic particle; anda fixation layer for fixing the magnetic particle arranged on a surface of the second magnetic film,wherein all of the surface of the second magnetic film is set within a circle having a radius of d/21/2, where d represents a distance between the surface of the second magnetic film and a center of the magnetic particle, when the magnetic particle is fixed to the magnetoresistive effect film through the fixation layer,a direction of an external magnetic field for magnetizing the magnetic particle is parallel to a magnetization direction of the second magnetic film, andall of the second magnetic film is arranged in a region in which a stray magnetic field in an opposite direction from that in which the external magnetic field is applied.

A detection kit for detecting a target material in a specimen, the kit comprising at least:na sensing element including a magnetoresistive effect film having a first magnetic film with a fixed magnetization direction and a second magnetic film serving as a perpendicularly magnetized film with a magnetization direction variable at the detection of the magnetic particle;a fixation layer for fixing the magnetic particle arranged on a surface of the second magnetic film;a detection reagent including a magnetic particle on which a trap for trapping the target material is fixed,wherein all of the surface of the second magnetic film is set within a circle having a radius of 21/2d, where d represents a distance between the surface of the second magnetic film and a center of the magnetic particle, when the magnetic particle is fixed to the magnetoresistive effect film through the fixation layer,a direction of an external magnetic field for magnetizing the magnetic particle is parallel to a magnetization direction of the second magnetic film, andall of the second magnetic film is arranged in a region in which a stray magnetic field in an opposite direction from that in which the external magnetic field is applied.

A detection kit for detecting a target material in a specimen, the kit comprising at least:na sensing element including a magnetoresistive effect film having a first magnetic film with a fixed magnetization direction and a second magnetic film serving as an in-plane magnetized film with a magnetization direction variable at the detection of the magnetic particle;a fixation layer for fixing the magnetic particle arranged on a surface of the second magnetic film; anda detection reagent including a magnetic particle on which a trap for trapping the target material is fixed,wherein all of the surface of the second magnetic film is set within a circle having a radius of d/21/2, where d represents a distance between the surface of the second magnetic film and a center of the magnetic particle, when the magnetic particle is fixed to the magnetoresistive effect film through the fixation layer,a direction of an external magnetic field for magnetizing the magnetic particle is parallel to a magnetization direction of the second magnetic film, andall of the second magnetic film is arranged in a region in which a stray magnetic field in an opposite direction from that in which the external magnetic field is applied.