Magnetism of Nanostructures

The objective of the OR is to study the dynamics of magnetization in magnetic nanostructures. The problem of magnetic skyrmions and the Dzyaloshinskii Moriya Interaction (iDMI) is currently a major focus of the OR. As examples, we are interested in the effects of electric field, ion irradiation and annealing temperature on the iDMI constant as well as in the relationship between iDMI, perpendicular interface anisotropy and induced proximity magnetism. This interaction is also studied in more complex systems such as multilayers coupled by interlayer exchange.

Our investigations also focus on iDMI in magnonic crystal-based systems and its effect on band structures for spin waves (USPC-NUS(Singapore) collaboration). Finally, we plan to couple these Brillouin spectroscopy studies with magnetic force microscopy observations to design systems with stable Skyrmion structures at room temperature. Although we are already interested in new problems of interaction at interfaces such as the study of molecular/ferromagnetic interfaces, in collaboration with colleagues from the University of Paris-Diderot (HEFOR structuring project of the Labex SEAM), the effort is focused on new topics recently initiated within the team. These are the study of spin pumping phenomena and the spin Hall effect in FM/HM systems by FMR. A particular interest is focused on the measurements of the intrinsic conductance by spin mixing, the spin diffusion length and the spin Hall effect angle as a function of the ion irradiation and the annealing temperature.

Finally, we continue our investigations on the perpendicular magnetic anisotropy by looking at the effects of the electric field. Throughout these studies, we take advantage of our national and international collaborations, in particular with our industrial partners such as Samsung (Saint-José, USA) or GlobalFounderies (Singapore). In addition, we bring our skills in ferromagnetic resonance to the theme of flexible magnetic systems, in strong interaction with the Mechanical OR of functional thin films for the development of original in situ techniques.

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