کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
737576 1461926 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Planar Hall effect sensor with magnetostatic compensation layer
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Planar Hall effect sensor with magnetostatic compensation layer
چکیده انگلیسی

Demagnetization effects in cross-shaped planar Hall effect sensors cause inhomogeneous film magnetization and a hysteretic sensor response. Furthermore, when using sensors for detection of magnetic beads, the magnetostatic field from the sensor edges attracts and holds magnetic beads near the sensor edges causing inhomogeneous and non-specific binding of the beads. We show theoretically that adding a compensation magnetic stack beneath the sensor stack and exchange-biasing it antiparallel to the sensor stack, the magnetostatic field is minimized. We show experimentally that the compensation stack removes nonlinear effects from the sensor response, it strongly reduces hysteresis, and it increases the homogeneity of the bead distribution. Finally, it reduces the non-specific binding due to magnetostatic fields allowing us to completely remove beads from the compensated sensor using a water flow 60 times smaller than a flow that failed to remove beads from an uncompensated sensor.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators A: Physical - Volume 174, February 2012, Pages 1–8
نویسندگان
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