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Noise Characterization of Vortex-State GMR Sensors with Different Free Layer Thicknesses

Physics of Functional Materials, University of Vienna, 1090 Vienna, Austria
Department for Integrated Sensor Systems, Danube University Krems, 2700 Wiener Neustadt, Austria
Infineon Technologies Austria AG, 9500 Villach, Austria
Author to whom correspondence should be addressed.
Presented at the Eurosensors 2018 Conference, Graz, Austria, 9–12 September 2018.
Proceedings 2018, 2(13), 1013;
Published: 3 December 2018
(This article belongs to the Proceedings of EUROSENSORS 2018)
The spin valve principle is the most prominent sensor design among giant- (GMR) and tunneling (TMR) magnetoresistive sensors. A new sensor concept with a disk shaped free layer enables the formation of a flux-closed vortex magnetization state if a certain relation of thickness to diameter is given. The low frequency noise of current-in-plane GMR sensing elements with different free layer thicknesses at different external field strengths has been measured. The measurements of the 1/f noise in external fields enabled a separation of magnetic and electric noise contributions. It has been shown that while the sensitivity is increasing with a decreasing element thickness, the pink noise contribution is increasing too. Still the detection limit at low frequencies is better in thinner free layer elements due to the higher sensitivity.
Keywords: giant magnetoresistance; GMR; noise; vortex state giant magnetoresistance; GMR; noise; vortex state
MDPI and ACS Style

Weitensfelder, H.; Brueckl, H.; Satz, A.; Suess, D. Noise Characterization of Vortex-State GMR Sensors with Different Free Layer Thicknesses. Proceedings 2018, 2, 1013.

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