Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.19: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Noise level optimisation in PHE sensors for magnetic nanoparticles detection — •Anastasiia Moskaltsova, Luca Marnitz, Jan-Michael Schmalhorst, and Günter Reiss — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Universitätsstraße 25, Bielefeld 33615, Germany

Magnetoresistive (MR) sensors are well known for their various applications, including magnetic nanoparticles (MNPs) detection. In frame of the EU H2020 MADIA project [1] we focus on real-time MNPs detection using planar Hall effect (PHE) MR sensors. The main goal of the project is to develop a versatile and cost-effective tool for early diagnosis of Alzheimers and Parkinsons diseases. This can be achieved by combining high sensitivity sensors with microfluidics and functionalized MNPs. Noise level is among the relevant sensor characterisitics, as it gives the information on the minimum detectable magnetic field for a given frequency. Recently, the noise level of ∼ pT/√Hz was achieved for magnetic tunnel junctions [2].

In this work we study PHE sensors noise in the frequency range from 1 Hz to 10 kHz. A study on influence of the PHE sensor size and the applied current on the noise level is conducted, as these parameters are inlcuded in the phenomenological Hooge model of noise [3].

[1] http://www.madia-project.eu

[2] Chaves et al. Appl. Phys. Lett. 91, 102504 (2007)

[3] F. N. Hooge, IEEE T. Electron. Dev., 41, 1926, (1994 )