Comparison of Sensitivity and Low Frequency Noise Contributions in GMR and TMR Spin Valve Sensors with a Vortex State Free Layer

Magnetoresistive spin valve sensors based on the giant- (GMR) and tunnelling- (TMR) magnetoresisitve effect with a flux-closed vortex state free layer design are compared by means of sensitivity and low frequency noise. The vortex state free layer enables high saturation fields with negligible hyste...

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Bibliographic Details
Published in:arXiv.org 2018-04
Main Authors: Weitensfelder, Herbert, Brueckl, Hubert, Satz, Armin, Pruegl, Klemens, Zimmer, Juergen, Luber, Sebastian, Raberg, Wolfgang, Abert, Claas, Bruckner, Florian, Bachleitner-Hofmann, Anton, Windl, Roman, Suess, Dieter
Format: Article
Language:English
Subjects:
LF noise
Linearity
Magnetoresistivity
Noise
Noise sensitivity
Rangefinding
Sensors
Spin valves
Vortices
White noise
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Summary:Magnetoresistive spin valve sensors based on the giant- (GMR) and tunnelling- (TMR) magnetoresisitve effect with a flux-closed vortex state free layer design are compared by means of sensitivity and low frequency noise. The vortex state free layer enables high saturation fields with negligible hysteresis, making it attractive for applications with a high dynamic range. The measured GMR devices comprise lower pink noise and better linearity in resistance but are less sensitive to external magnetic fields than TMR sensors. The results show a comparable detectivity at low frequencies and a better performance of the TMR minimum detectable field at frequencies in the white noise limit.
ISSN:2331-8422
DOI:10.48550/arxiv.1804.06940