The 238th Special CMSM seminar   

Super-sensitive magnetic tunnel junction based sensor devices

Dr. Mikihiko Oogane
Department of Applied Physics, Tohoku University

Date & Time: 15:00 - 16:00, May 16th (Wed), 2018.
Place: 8F Medium Seminar Room(#811-812), Sengen.


  We develop magnetic sensor devices with high sensitivity, small size, low power consumption and low cost using magnetic tunnel junctions (MTJs). MTJ-based magnetic sensors can be widely used in various fields, such as environment, security, medical appliances, information technology, and automobiles etc. Recently, we have succeeded to demonstrate real-time magnetocardiography (MCG) and magnetoencephalography (MEG) measurements at room temperature by improvement of the sensitivity of MTJ-based sensors. In addition, we developed linear MTJ-based magnetic sensors with a wide sensing field range and very small nonlinearity using perpendicular ferromagnetic material. The developed MTJs with a high reliability can be applied to magnetic sensors for automobiles. We have also fabricated MTJ-based magnetic sensors for non-destructive inspections for micro-sized cracks at surface of metals. We have succeeded to detect very small surface cracks of metals (ca. 100μm) with a high signal-to-noise-ratio by the integration of MTJ devices.