Publication Date:
2018-11-27
Description:
Author(s): Herbert Weitensfelder, Hubert Brueckl, Armin Satz, Klemens Pruegl, Juergen Zimmer, Sebastian Luber, Wolfgang Raberg, Claas Abert, Florian Bruckner, Anton Bachleitner-Hofmann, Roman Windl, and Dieter Suess For giant- (GMR) and tunneling- (TMR) magnetoresistive sensors, noise and sensitivity are crucial in determining the smallest magnetic field that can be detected. Both parameters are analyzed for a sensor design comprising a circular free layer that features a flux-closed vortex magnetization state. The authors find that in the low-frequency regime, where noise is predominantly pink, the detectivity depends o n l y on the active sensor area, not on the magnetoresistance ratio or bias voltage, and is the same for both GMR and TMR devices. As such sensors are widely used in e . g . biomedical, automotive, and aerospace applications, this insight is expected to be far-reaching. [Phys. Rev. Applied 10, 054056] Published Mon Nov 26, 2018
Electronic ISSN:
2331-7019
Topics:
Physics
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