Project A1

Magnetostrictive Multilayers for Magnetoelectric Sensors

Novel magnetostrictive multilayers for magnetoelectric (ME) 2-2 structures are explored with an emphasis on the control of magnetic domain processes for obtaining highly sensitive and low-noise magnetic field sensors. Different sputtered magnetic film systems with high piezomagnetic coefficients are investigated by in-operando methods under consideration of various processing parameters. The main goal of research is to decrease the limit of magnetic field detection of the ME sensors for the endeavored biomagnetic measurements.

Role within the Collaborative Research Centre

In the preceding projects (CRC855 and PAK902), magnetic noise contributions have been identified as one factor limiting the performance of ME sensors. The global objective of project A1 is the research of advanced magnetostrictive multilayers. Incorporating the multilayers into ME sensors will lead to a significantly reduced noise level, higher sensitivity, and improved limit of detection of ME devices. Project A1 plays a central role within the CRC to achieve an improved signal-to-noise ratio, which is essential to the targeted biomagnetic applications. This project will collaborate closely on the sensor fabrication, magnetic characterization, and modeling with groups in research area A. Magnetic domain related noise characterization is performed with B1 and Z2. A strong cooperation on integration issues will take place with project Z1. Project A1 will contribute to the focus groups F1 “Modeling” and F2 “Sensor Concepts” on issues of the magnetostrictive phase for ME sensors. Collaborations with the following projects are planned:

A2:	Advice will be given to A2 on magnetic material related issues.
A3:	The role of edge profiles and of roughness on the magnetic behavior will be investigated together. High temperature stable multilayers will be supplied for the ME sensors of A3.
A4:	FeGaB as an alternative material for ΔE sensors will be studied together with A4.
A6:	Micro and atomic scale structural investigation will be carried out with A6. The correlation of magnetic properties with microstructural features will be the focus of the close collaboration.
A5:	Modeling of noise behavior of piezotronic sensor systems and associated electronics.
A7:	Cooperation of the time-resolved investigations of the magnetic domain structures of electrically modulated ME sensors will be directed with A7.
A8:	Calculations of stress distributions in magnetostrictive layers are obtained from A8. Data on magnetostrictive material response will be provided to A8.
B1:	Noise studies and tailoring the ME response with regard to the frequency modulation technique and simultaneously controlling the magnetic domain will be conducted together with B1.
B7:	Magnetostrictive layers for the application in strong modulating fields will be developed for use in B7.
Z1:	The integration of changed or altered magnetostrictive multilayers into ME devices will take place in close cooperation with Z1.
Z2:	The ME measurement setup will be changed for flexible magnetic field excitations schemes with Z2. Sensitivity, limit of detection (LoD), and noise measurements are conducted in collaboration.

Project-related Publications

N. Lukat, R.-M. Friedrich, B. Spetzler, C. Kirchhof, C. Arndt, L. Thormälen, F. Faupel, C. Selhuber-Unkel, Mapping of magnetic nanoparticles and cells using thin film magnetoelectric sensors based on the delta-E effect Sens. Actuators A, 309. 112023, (2020), https://doi.org/10.1016/j.sna.2020.112023

S. Salzer, V. Röbisch, M. Klug, P. Durdaut, J. McCord, D. Meyners, J. Reermann, M. Höft, R. Knöchel, Noise Limits in Thin-Film Magnetoelectric Sensors With Magnetic Frequency Conversion. IEEE Sensors Journal, vol. 18, no. 2, pp. 596-604 (2018). http://dx.doi.org/10.1109/JSEN.2017.2776039

A. Kittmann, P. Durdaut, S. Zabel, J. Reermann, J. Schmalz, B. Spetzler, D. Meyners, N. X. Sun, J. McCord, M. Gerken, G. Schmidt, M. Höft, R. Knöchel, F. Faupel, E. Quandt, Wide Band Low Noise Love Wave Magnetic Field Sensor System. Scientific Reports, vol. 8, no. 278 (2018). http://dx.doi.org/10.1038/s41598-017-18441-4

P. Durdaut, S. Salzer, J. Reermann, V. Röbisch, J. McCord, D. Meyners, E. Quandt, G. Schmidt, R. Knöchel, M. Höft, Improved Magnetic Frequency Conversion Approach for Magnetoelectric Sensors. IEEE Sensors Letters, vol. 1, no. 3 (2017). http://dx.doi.org/10.1109/LSENS.2017.2699559

P. Durdaut, S. Salzer, J. Reermann, V. Röbisch, P. Hayes, A. Piorra, D. Meyners, E. Quandt, G. Schmidt, R. Knöchel, M. Höft, Thermal-Mechanical Noise in Resonant Thin-Film Magnetoelectric Sensors. IEEE Sensors Journal, vol. 17, no. 8, pp. 2338-2348 (2017). http://dx.doi.org/10.1109/JSEN.2017.2671442

S. Salzer, P. Durdaut, V. Röbisch, D. Meyners, E. Quandt, M. Höft, R. Knöchel, Generalised Magnetic Frequency Conversion for Thin Film Laminate Magnetoelectric Sensors. IEEE Sensors Journal, vol. 17, no. 5, pp. 1373-1383 (2017). http://dx.doi.org/10.1109/JSEN.2016.2645707

Röbisch, V., Salzer, S., Urs, N. O., Reermann, J., Yarar, E., Piorra, A., ... & Knöchel, R., Pushing the detection limit of thin film magnetoelectric heterostructures. Journal of Materials Research, 32(6), 1009-1019 (2017). DOI: https://doi.org/10.1557/jmr.2017.58

Salzer, S., Durdaut, P., Röbisch, V., Meyners, D., Quandt, E., Höft, M., & Knöchel, R., Generalized magnetic frequency conversion for thin-film laminate magnetoelectric sensors. IEEE Sensors Journal, 17(5), 1373-1383 (2017). DOI: 10.1109/JSEN.2016.2645707

M. Abes, C. T. Koops, S. B. Hrkac, J. McCord, N. O. Urs, N. Wolff, L. Kienle, W. J. Ren, L. Bouchenoire, B. M. Murphy, O. M. Magnussen, Domain Structure and Reorientation in CoFe2O4. Phys. Rev. B 93, 195427 (2016) http://dx.doi.org/10.1103/PhysRevB.93.195427

N.O. Urs, B. Mozooni, P. Mazalski, M. Kustov, P. Hayes, S. Deldar, E. Quandt, J. McCord, Advanced Magneto-optical Microscopy, Imaging from Picoseconds to Centimeters - Imaging Spin Waves and Temperature Distributions (invited). AIP Advances 6, 055605 (2016). http://dx.doi.org/10.1063/1.4943760

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Project A1

Magnetostrictive Multilayers for Magnetoelectric Sensors

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Role within the Collaborative Research Centre

Project-related Publications

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