Tohoku University Technology: A metal-based Hall sensor material is coming!! : T18-016
Cheap ingredients and low-T fabrication compatible with mass production Hall sensor operable under bending conditions and over a wide T range
Conventional Hall sensors (a type of magnetic-field sensors) rely on highly crystalline semiconductors such as GaAs and InSb that show the large ordinary Hall effect. However, the requirements for low carrier density and high mobility impose strong constraints on the fabrication processes and conditions. Also, their strong Tdependent electrical properties must be cancelled out with additional ICs to achieve Hall sensor operation over a wide practical T range. This invention describes a ferromagnetic Fe-Sn alloy, which can work as a superior Hall sensor material owing to the large anomalous Hall effect. This novel material offers many technological advantages including cheap and non-toxic ingredients, the roomtemperature growth on various substrates, and high sensitivity and thermal stability.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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