Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 58, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/1347-4065/ab12c0
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Funding
- Tohoku University Nanofabrication (MEMS) Platform
- Tokyo University Nanofabrication Platform in Nanotechnology Platform Project - Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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Strain-gauge sensors consisting of magnetic tunnel junctions (MTJs) have attracted attention because of their high strain sensitivity based on a novel strain sensing scheme different from the piezoresistive effect. To maximize the strain sensitivity of these spintronic strain-gauge sensors (Spin-SGSs), we previously developed an MTJ film with magnetostrictive material that acutely rotates with strain. This review presents a Spin-SGS with a high gauge factor in excess of 5000, which was achieved by adopting an amorphous FeB-based sensing layer with high magnetostriction and low coercivity in a high magnetoresistance Mg-O barrier MTJ. We also investigated the feasibility of using this Spin-SGS in microelectromechanical system (MEMS) sensor devices. This review also describes the properties of a Spintronic MEMS (Spin-MEMS) microphone, in which Spin-SGSs are integrated onto a bulk micromachined diaphragm. (c) 2019 The Japan Society of Applied Physics
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