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The Internet of things (IoT) has a great potential to make our world more advanced and intelligent. Besides the software and platform integration the physical sensing device is a critical element for the complete system of IoT. Among various types of sensors and/or transducers thin film magnetoresistive sensors have been an attractive candidate widely used in different applications in the past decades for measurements of linear and angular positions, or magnetic field or current, motion and compassing (2 or 3 axis).

Magnetic sensors started with Hall sensors and migrated into MR (Magnetoresistence) or specifically AMR (Anisotropic MR) sensors and now on the verge of more advanced GMR (Giant MR) and TMR (Tunneling MR) sensors. Due to the nature of electron spin physics certain magnetic thin films exhibit magnetoresistive (MR) effect which is a change of resistivity under the influence of applied magnetic field. AMR sensors have been commercially used first and now some research work published for GMR and TMR sensors which show better sensitivity thus SNR. Recording heads are the core technology for hard disc drive industry which essentially leads the way for magnetic sensor applications. AMR heads are out of the market decades ago and GMR heads also exited. In recent years the TMR sensor has been a standard device due to the extremely high sensitivity and reliability. We will discuss different aspects of the TMR sensors in this article and focusing on the world first commercial TMR current sensors and other types of magnetic imaging sensors produced by Sinomags.

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