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삼층박막 구조의 PHR 센서를 이용한 자기 박테리아 감지
유상엽(Sang Yeob Yoo),임병화(Byeong Hwa Lim),송인철(In Cheol Song),김철기(Cheol Gi Kim),오선종(Sun Jong Oh) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.6
In this study, we have fabricated magnetoresistive sensors of 50 μm × 50 μm cross type by trilayer structure of antiferromagnetic/nonmagnetic/ferromagnetic. The magnetic signal and magnetic domain of this sensor is measured. The sensor hysteresis loop is not in symmetrical at 0 Oe. This is may be due to the exchange coupling between ferromagnetic layer and anti ferromagnetic layer. This exchange bias value is 20 Oe. The sensor signal is measured at between the applied magnetic field and current. The sensor signal is measured between the applied magnetic field and current at 20˚ and 90˚ angles. The sensitivity of sensor signals is 20 μV/Oe and 7 μV/Oe at 20˚ and 90˚ angles, respectively. In addition, this sensor is also applied for the detection of magnetic bacteria at 20˚ angle. From these results, we calculate the stray field of single bacteria is to be 5 × 10<SUP>?5</SUP>Oe.