Low-frequency noise in planar Hall effect bridge sensors

Anders Persson; R.S. Bejhedb; R.S. Bejhed; H. Nguyen; K. Gunnarsson; Bjarke Thomas Dalslet; Frederik Westergaard Østerberg; Mikkel Fougt Hansen; P. Svedlindh

doi:10.1016/j.sna.2011.09.014

Low-frequency noise in planar Hall effect bridge sensors

Anders Persson, R.S. Bejhedb, R.S. Bejhed, H. Nguyen, K. Gunnarsson, Bjarke Thomas Dalslet, Frederik Westergaard Østerberg, Mikkel Fougt Hansen, P. Svedlindh

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The low-frequency characteristics of planar Hall effect bridge sensors are investigated as function of the sensor bias current and the applied magnetic field. The noise spectra reveal a Johnson-like spectrum at high frequencies, and a 1/f-like excess noise spectrum at lower frequencies, with a knee frequency of around 400Hz. The 1/f-like excess noise can be described by the phenomenological Hooge equation with a Hooge parameter of γH=0.016. The detectivity is shown to depend on the total length, width and thickness of the bridge branches. The detectivity is improved by the square root of the length increase. Moreover, the detectivity is shown to depend on the amplitude of the applied magnetic field, revealing a magnetic origin to part of the 1/f noise.

Original language	English
Journal	Sensors & Actuators: A. Physical
Volume	171
Issue number	2
Pages (from-to)	212-218
ISSN	0924-4247
DOIs	https://doi.org/10.1016/j.sna.2011.09.014
Publication status	Published - 2011

Keywords

Detectivity
Magnetoresistance
Low-frequency noise
Planar Hall effect

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@article{17e04f6f608240e9b1c0e80eb6b1d705,

title = "Low-frequency noise in planar Hall effect bridge sensors",

abstract = "The low-frequency characteristics of planar Hall effect bridge sensors are investigated as function of the sensor bias current and the applied magnetic field. The noise spectra reveal a Johnson-like spectrum at high frequencies, and a 1/f-like excess noise spectrum at lower frequencies, with a knee frequency of around 400Hz. The 1/f-like excess noise can be described by the phenomenological Hooge equation with a Hooge parameter of γH=0.016. The detectivity is shown to depend on the total length, width and thickness of the bridge branches. The detectivity is improved by the square root of the length increase. Moreover, the detectivity is shown to depend on the amplitude of the applied magnetic field, revealing a magnetic origin to part of the 1/f noise.",

keywords = "Detectivity, Magnetoresistance, Low-frequency noise, Planar Hall effect",

author = "Anders Persson and R.S. Bejhedb and R.S. Bejhed and H. Nguyen and K. Gunnarsson and Dalslet, {Bjarke Thomas} and {\O}sterberg, {Frederik Westergaard} and Hansen, {Mikkel Fougt} and P. Svedlindh",

year = "2011",

doi = "10.1016/j.sna.2011.09.014",

language = "English",

volume = "171",

pages = "212--218",

journal = "Sensors and Actuators A: Physical",

issn = "0924-4247",

publisher = "Elsevier",

number = "2",

}

Low-frequency noise in planar Hall effect bridge sensors. / Persson, Anders; Bejhedb, R.S.; Bejhed, R.S.; Nguyen, H.; Gunnarsson, K.; Dalslet, Bjarke Thomas; Østerberg, Frederik Westergaard; Hansen, Mikkel Fougt; Svedlindh, P.

In: Sensors & Actuators: A. Physical, Vol. 171, No. 2, 2011, p. 212-218.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Low-frequency noise in planar Hall effect bridge sensors

AU - Persson, Anders

AU - Bejhedb, R.S.

AU - Bejhed, R.S.

AU - Nguyen, H.

AU - Gunnarsson, K.

AU - Dalslet, Bjarke Thomas

AU - Østerberg, Frederik Westergaard

AU - Hansen, Mikkel Fougt

AU - Svedlindh, P.

PY - 2011

Y1 - 2011

N2 - The low-frequency characteristics of planar Hall effect bridge sensors are investigated as function of the sensor bias current and the applied magnetic field. The noise spectra reveal a Johnson-like spectrum at high frequencies, and a 1/f-like excess noise spectrum at lower frequencies, with a knee frequency of around 400Hz. The 1/f-like excess noise can be described by the phenomenological Hooge equation with a Hooge parameter of γH=0.016. The detectivity is shown to depend on the total length, width and thickness of the bridge branches. The detectivity is improved by the square root of the length increase. Moreover, the detectivity is shown to depend on the amplitude of the applied magnetic field, revealing a magnetic origin to part of the 1/f noise.

AB - The low-frequency characteristics of planar Hall effect bridge sensors are investigated as function of the sensor bias current and the applied magnetic field. The noise spectra reveal a Johnson-like spectrum at high frequencies, and a 1/f-like excess noise spectrum at lower frequencies, with a knee frequency of around 400Hz. The 1/f-like excess noise can be described by the phenomenological Hooge equation with a Hooge parameter of γH=0.016. The detectivity is shown to depend on the total length, width and thickness of the bridge branches. The detectivity is improved by the square root of the length increase. Moreover, the detectivity is shown to depend on the amplitude of the applied magnetic field, revealing a magnetic origin to part of the 1/f noise.

KW - Detectivity

KW - Magnetoresistance

KW - Low-frequency noise

KW - Planar Hall effect

U2 - 10.1016/j.sna.2011.09.014

DO - 10.1016/j.sna.2011.09.014

M3 - Journal article

VL - 171

SP - 212

EP - 218

JO - Sensors and Actuators A: Physical

JF - Sensors and Actuators A: Physical

SN - 0924-4247

IS - 2

ER -