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Strained Quantum Well InAs Micro-Hall Sensors: Dependence of Device Performance on Channel Thickness
Ist Teil von
IEEE transactions on electron devices, 2008-02, Vol.55 (2), p.695-700
Ort / Verlag
New York, NY: IEEE
Erscheinungsjahr
2008
Quelle
IEEE
Beschreibungen/Notizen
Magnetic sensitivity and low-frequency noise in micro-Hall sensors based on pseudomorphic InAs quantum well channels are investigated as functions of InAs thickness. The strained InAs quantum wells with thickness between 0 and 20 Aring are added into lattice-matched doped channel In 0.53 Ga 0.47 As/In 0.47 Al 0.48 As/InP heterostructures and enhance the absolute magnetic sensitivity by increasing the electron mobility. We show that the increase of the InAs channel thickness also leads to a significant reduction of the low-frequency noise. The result is an improved magnetic field detection over a broad frequency range. A minimum magnetic field detection limit of nT is resolved by a 40-m wide doped channel micro-Hall device at frequencies around kHz.