Linear Spin-Valve Bridge Sensor for Weak Magnetic Fields

Author

Li, Wei ; Liu, Huarui ; Ren, Tianling ; Liu, Litian ; Zhang, Xun

Author_Institution

Inst. of Microelectron., Tsinghua Univ., Beijing

fYear

2006

fDate

18-21 Jan. 2006

Firstpage

533

Lastpage

536

Abstract

Spin-valves are utilized in a variety of devices including magnetic sensors and biological detection systems. The sensing devices are characterized by three parameters: the sensing field range, sensitivity and linearity. The linear spin-valve sensing element is configured as a Wheatstone bridge. Two kinds Wheatstone bridge were investigated. First, the bridge consist of two sensing resistors and two fixed value resistors, which has no hysteresis and linearity error is less than 0.15% in the operation range of -6 Oe to 6 Oe, shows a sensitivity of 0.78 mV/VmiddotOe. Second, the linear bridge sensor consisting of four sensing resistors shows a sensitivity of 1.54 mV/VmiddotOe in the operation range of -6 Oe to 6 Oe and a linearity error less than 0.3%

Keywords

bridge circuits; magnetic sensors; resistors; spin valves; Wheatstone bridge; fixed value resistors; linear spin valve bridge sensor; linearity error; operation range; sensing field range; sensing resistors; sensitivity; weak magnetic fields; Anisotropic magnetoresistance; Biosensors; Bridge circuits; Giant magnetoresistance; Linearity; Magnetic anisotropy; Magnetic materials; Magnetic sensors; Resistors; Spin valves; linear sensor; spin valve; weak magnetic field;

fLanguage

English

Publisher

ieee

Conference_Titel

Nano/Micro Engineered and Molecular Systems, 2006. NEMS '06. 1st IEEE International Conference on

Conference_Location

Zhuhai

Print_ISBN

1-4244-0139-9

Electronic_ISBN

1-4244-0140-2

Type

conf

DOI

10.1109/NEMS.2006.334834

Filename

4135011