Monolithic integration of focused 2D GMR spin valve magnetic field sensor for high-sensitivity (compass) applications (Presentation Recording)

Olaf Ueberschär; Maria J. Almeida; Patrick Matthes; Mathias Müller; Ramona Ecke; Horst Exner; Stefan E. Schulz

doi:10.1117/12.2188001

5 October 2015 Monolithic integration of focused 2D GMR spin valve magnetic field sensor for high-sensitivity (compass) applications (Presentation Recording)

Olaf Ueberschär, Maria J. Almeida, Patrick Matthes, Mathias Müller, Ramona Ecke, Horst Exner, Stefan E. Schulz

Author Affiliations +

Proceedings Volume 9551, Spintronics VIII; 955129 (2015) https://doi.org/10.1117/12.2188001
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

We have designed and fabricated 2D GMR spin valve sensors on the basis of IrMn/CoFe/Cu/CoFe/NiFe nanolayers in monolithic integration for high sensitivity applications. For a maximum signal-to-noise ratio, we realize a focused double full bridge layout featuring an antiparallel exchange bias pinning for neighbouring meanders and an orthogonal pinning for different bridges. This precise alignment is achieved with microscopic precision by laser heating and subsequent in-field cooling. Striving for maximum signal sensitivity and minimum hysteresis, we study in detail the impact of single meander geometry on the total magnetic structure and electronic transport properties. The investigated geometrical parameters include stripe width, stripe length, cross bar material and total meander length. In addition, the influence of the relative alignment between reference magnetization (pinned layer) and shape anisotropy (free layer) is studied. The experimentally obtained data are moreover compared to the predictions of tailored micromagnetic simulations. Using a set of optimum parameters, we demonstrate that our sensor may readily be employed to measure small magnetic fields, such as the ambient (geomagnetic) field, in terms of a 2D vector with high spatial (~200 μm) and temporal (~1 ms) resolution.

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Olaf Ueberschär, Maria J. Almeida, Patrick Matthes, Mathias Müller, Ramona Ecke, Horst Exner, and Stefan E. Schulz "Monolithic integration of focused 2D GMR spin valve magnetic field sensor for high-sensitivity (compass) applications (Presentation Recording)", Proc. SPIE 9551, Spintronics VIII, 955129 (5 October 2015); https://doi.org/10.1117/12.2188001

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KEYWORDS

Magnetic sensors

Bridges

Magnetism

Sensors

Anisotropy

Optical alignment

Signal to noise ratio

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