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

1
Physics of Functional Materials, University of Vienna, 1090 Vienna, Austria
2
Department for Integrated Sensor Systems, Danube University Krems, 2700 Wiener Neustadt, Austria
3
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; https://doi.org/10.3390/proceedings2131013
Published: 3 December 2018
(This article belongs to the Proceedings of Eurosensors)
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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