Magnetic sensor

Tunnel magneto-resistive sensor (TMR sensor) with high sensitivity and accuracy

Overview

　Various magnetic sensors such as the Hall sensor, are widely used for the realization of an advanced IoT society. In particular, magnetic sensors based on the tunnel magnetoresistance effect (TMR sensor) discovered at Tohoku University has made dramatic progress in increasing sensitivity, making it possible to detect a weak magnetic field such as bio-magnetic field.
　However, the conventional TMR sensor did not achieve both high sensitivity and accuracy.
　This invention is able to provide a TMR sensor with extremely high linearity output which is necessary to achieve high sensitivity and accuracy, by controlling the higher-order magnetic anisotropy of the used ferromagnetic material.

Features・Outstandings

Product Application

・Current sensor able to monitor with high accuracy the battery current of an electric vehicle, etc.
・Non-destructive testing sensor that can detect with high accuracy the corrosion or deterioration of infrastructures

Related Works

[1] Takahiro Ogasawara, Mikihiko Oogane, Muftah Al-Mahdawi, Masakiyo Tsunoda, and Yasuo Ando, Scientific Reports, 9, 17018 (2019)

IP Data

IP No.　 ： JP2019-198090
Inventor ： OGASAWARA Takahiro, OGANE Mikihiko, TSUNODA Masakiyo, ANDO Yasuo
keyword ： Electronics, Hardware, Material