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MA: Fachverband Magnetismus

MA 25: Magnetic Imaging and Sensors II

MA 25.11: Vortrag

Mittwoch, 20. März 2024, 12:15–12:30, EB 301

Magnetic field mapping with a GMR sensor array: "An IR-camera analogy" — •Laila Bondzio¹, Torben Tappe¹, Holger Sachs², Bernd Rebhorn², and Andreas Hütten¹ — ¹Bielefeld University, Bielefeld, Germany — ²Messtechnik Sachs GmbH, Schorndorf, Germany

Giant Magnetic Resistance multilayer systems of Py/Cu-bilayers exhibit nearly triangular shaped GMR curves with a high sensitivity, which is desirable for sensor applications. With a grid of multiple sensor elements a two dimensional magnetic landscapes can be mapped as changes in a magnetic field with an output image similar to an IR-camera. The challenging aspect for such an application is the necessity to cover a relatively large area of few centimeters with sensor elements. To organize and contact this large number of sensor elements the structures can be sputtered directly onto contacts on a circuit board. Using an optimized buffer system ontop of a not ideal substrate improves the GMR effect and provides a foundation for a CPP (current perpendicular to plane) configuration.

Keywords: GMR; magnetic field sensor; mapping