BIOSENSOR, MAGNETIC MOLECULE MEASUREMENT METHOD, AND MEASUREMENT OBJECT MEASURING METHOD

摘要

A biosensor not requiring washing of unbound label molecules by analyzing an object to be measured such as an antigen, antibody, a DNA molecule or RNA molecule by detection of a magnetic field. The biosensor is small in size, low in price and high in sensing accuracy. Semiconductor Hall devices are arranged two-dimensionally in an array on the bottoms of recesses on the surface of a sensor chip to detect magnetic fields produced to the sensor surface of the sensor chip to which magnetic molecules labeled with magnetic particles are bound. The surface area of each semiconductor Hall device is equal to or less than the maximum cross-section area of the magnetic molecule, and the intervals between the semiconductor Hall devices are larger than the diameter of the magnetic molecule. Thus, the analysis accuracy is enhanced. An interconnection is used commonly to the semiconductor Hall devices, thereby reducing the size of the sensor. <IMAGE>