Magnetic Sensing, DNA Sensing and Polarization Analysis

Abstract

In this report, the research is summarized for magnetic sensing using the triple-layered magnetic film and application to a magnetic sensor. In addition, the outline of research is described concerning DNA information sensing system based on fluorescence polarization analysis and its relation to MEMS technology. In the magnetic sensing, the triple-layered magnetic film (Ni80Fe20/SiO2/Ni80Fe20, thickness; 150/10/150 nm each) is used as magnetic sensing material. It is considered that magnetic sensing is feasible by using the triple-layered magnetic film, and its sensitivity is higher than that using the single-layer magnetic film. It is suggested that theoretically, the triple-layered magnetic film will respond to high frequency magnetic field and, as a result, the more accurate shape of a magnetic pulse which contains the high frequency like a neural pulse in bio-magnetism will be measured than usual. In DNA sensing, the sequences have been measured for the sample in a capillary of nano-liter volume with the fluorescent label exited by the semiconductor laser. In this research, both sensing systems are based on the principle of light polarization analysis with semiconductor lasers and beam splitters etc., so that the miniaturization of the systems will be also feasible for the ubiquitous multi-sensing.