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Modern Magnetic Systems Members Publications

First-Order Reversal Curves

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First-order reversal curves are a powerful tool yielding microscopic information without the need for micron sized lateral resolution. The concept itself is simple and a measurement can in principle be conducted with any magnetometer capable of measuring a hysteresis loop. However, finishing a measurement, its evaluation, and interpretation within a convenient time frame can turn out to be challenging. Moreover, FORC diagrams can be quite challenging to interpret properly. In literature FORC are often seen as a characteristic magnetic fingerprint of a material, simply because the results can in fact be quite difficult to interpret. Nevertheless, FORC has proven to be an indispensable tool for magnetic characterization.

Measurement of FORC diagrams with MOKE

Fast high resolution first-order reversal curve measurements yield a unique insight into magnetization reversal processes.

GPU accelerated evaluation of FORC diagrams - gFORC

The GPU accelerated first-order reversal-curve calculator (gFORC) is not only 1000x faster than conventional approaches but also provides the user with some valuable information about the optimum smoothing factor.

Interpretation of FORC diagrams

FORC diagrams beyond the so-called Preisach model are difficult to interpret. We leverage a combination of microstructure design and microscopic imaging to push the boundaries of the theoretical framework of FORC.

Members

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Modern Magnetic Systems
Joachim Gräfe
  • Research Group Leader
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Modern Magnetic Systems
Felix Groß

Publications

Modern Magnetic Systems Article Tuning the magnetic properties of permalloy-based magnetoplasmonic crystals for sensor applications Murzin, D. V., Belyaev, V. K., Groß, F., Gräfe, J., Rivas, M., Rodionova, V. V. Japanese Journal of Applied Physics, 59(SE):SEEA04, IOP Publishing Ltd, Bristol, England, 2020 () DOI BibTeX
Modern Magnetic Systems Article Interpreting first-order reversal curves beyond the Preisach model: An experimental permalloy microarray investigation Groß, F., Ilse, S. E., Schütz, G., Gräfe, J., Goering, E. {Physical Review B}, 99(6), American Physical Society, Woodbury, NY, 2019 () DOI BibTeX
Modern Magnetic Systems Article gFORC: A graphics processing unit accelerated first-order reversal-curve calculator Groß, F., Martínez-García, J. C., Ilse, S. E., Schütz, G., Goering, E., Rivas, M., Gräfe, J. {Journal of Applied Physics}, 126(16), AIP Publishing, New York, NY, 2019 () DOI BibTeX
Modern Magnetic Systems Conference Paper Interpreting FORC diagrams beyond the Preisach model: an experimental permalloy micro array investigation Gross, F., Ilse, S., Schütz, G., Gräfe, J., Goering, E. In 2018 IEEE International Magnetics Conference (INTERMAG 2018), IEEE, Singapore, 2018 () DOI BibTeX
Modern Magnetic Systems Article Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi Muralidhar, S., Gräfe, J., Chen, Y., Etter, M., Gregori, G., Ener, S., Sawatzki, S., Hono, K., Gutfleisch, O., Kronmüller, H., et al. {Physical Review B}, 95(2), American Physical Society, Woodbury, NY, 2017 () DOI BibTeX
Modern Magnetic Systems Article Combined first-order reversal curve and x-ray microscopy investigation of magnetization reversal mechanisms in hexagonal antidot lattices Gräfe, J., Weigand, M., Stahl, C., Träger, N., Kopp, M., Schütz, G., Goering, E. J., Haering, F., Ziemann, P., Wiedwald, U. {Physical Review B}, 93(1), American Physical Society, Woodbury, NY, 2016 () DOI BibTeX
Modern Magnetic Systems Article Geometric control of the magnetization reversal in antidot lattices with perpendicular magnetic anisotropy Gräfe, J., Weigand, M., Träger, N., Schütz, G., Goering, E. J., Skripnik, M., Nowak, U., Haering, F., Ziemann, P., Wiedwald, U. {Physical Review B}, 93(10), American Physical Society, Woodbury, NY, 2016 () DOI BibTeX
Modern Magnetic Systems Conference Paper Combined FORC and x-ray microscopy study of magnetisation reversal in antidot lattices Gräfe, J., Haering, F., Stahl, C., Weigand, M., Skripnik, M., Nowak, U., Ziemann, P., Wiedwald, U., Schütz, G., Goering, E. In IEEE International Magnetics Conference (INTERMAG 2015), IEEE, Beijing, China, 2015 () DOI BibTeX
Modern Magnetic Systems Article Application of magneto-optical Kerr effect to first-order reversal curve measurements Gräfe, J., Schmidt, M., Audehm, P., Schütz, G., Goering, E. {Review of Scientific Instruments}, 85, American Institute of Physics, Woodbury, N.Y. [etc.], 2014 () DOI BibTeX