Patent ID: 11874345
Assignee: TDK CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A magnetic sensor used to detect a detection target substance in a sample, the magnetic sensor comprising:
a substrate having a first surface and a second surface, which is opposite the first surface;
a magnetoresistive effect element provided on the first surface of the substrate, wherein the resistance of the magnetoresistive effect element changes in accordance with an input magnetic field; and
a protective layer that covers the magnetoresistive effect element;
wherein a surface of the protective layer, which is positioned on top of the magnetoresistive effect element, has a prescribed surface roughness, and
a lower limit of a mean roughness Ra of the surface of the protective layer is 0.1 nm, and an upper limit of the mean roughness Ra is half a thickness of the protective layer on the magnetoresistive effect element.