Kim, Dohun Kim, Hyungkyung Park, Sunhee Lee, Wooyoung Jeung, Won Young 2024-01-20T22:31:32Z 2024-01-20T22:31:32Z 2021-09-03 2008-11 0018-9464 https://pubs.kist.re.kr/handle/201004/133010 Giant magneto impedance (GMI effect devices for magnetic bead detections were examined. Since commercialized magnetic beads in biological applications are superparamagnetic in nature, not only for improvement of maximum sensitivity but also precise optimizations of operating fields are crucial for sensor applications. We have found that operating fields and maximum sensitivity can be enhanced by the tailoring aspect ratio in microscopic GMI sensors. With an aspect ratio of 3.3-3.8, the GMI sensors were found to exhibit an overall GMI ratio of more than 110% and a maximum sensitivity of 1.61 mV/Oe (15.4%/Oe) at the operating field of 43.1 Oe. Our results demonstrate that microscopic GMI sensors are highly sensitive to magnetic bead detections. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC SENSORS Operating Field Optimization of Giant Magneto Impedance (GMI) Devices in Micro Scale for Magnetic Bead Detection Article 10.1109/TMAG.2008.2002611 1 IEEE TRANSACTIONS ON MAGNETICS, v.44, no.11, pp.3985 - 3988 IEEE TRANSACTIONS ON MAGNETICS 44 11 3985 3988 scie scopus 000262221300158 2-s2.0-77950787370 Engineering, Electrical & Electronic Physics, Applied Engineering Physics Article; Proceedings Paper SENSORS Magnetic bead detection magneto impedance root-mean-square (rms)-to-dc conversion skin effect uniaxial anisotropy