Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 41: Surface magnetism I
MA 41.5: Talk
Thursday, March 15, 2018, 10:30–10:45, EB 202
Excited spin-state trapping in spin crossover complexes on ferroelectric substrates — Christian Wäckerlin1,2, Fabio Donati3,4, Aparajita Singha1, Romana Baltic1, Silvio Decurtins5, Shi-Xia Liu5, Stefano Rusponi1, and •Jan Dreiser1,6 — 1Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland — 2Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland — 3Institute for Basic Science, Seoul 03760, Republic of Korea — 4Ewha Womans University, Seoul, Republic of Korea — 5University of Bern, 3012 Bern, Switzerland — 6Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
Spin crossover molecules exhibit a switchable spin state. Combining them with inorganic ferroelectrics represents a promising path toward magnetoelectric devices. Here we report on a study of films of Fe(II) spin crossover molecules deposited on differently poled ferroelectric PMN-PT ([Pb(Mg1/3Nb2/3)O3]1−x [PbTiO3]x, x = 0.32). X-ray absorption spectroscopy shows complete temperature driven conversion between high-spin and low-spin states independent of the substrate ferroelectric polarization down to 100 K. However, at T = 3 K, in the regime of soft X-ray induced excited spin-state trapping (SOXIESST), the cross section for the SOXIESST process varies by more than one order of magnitude between the two ferroelectric polarizations. We explain our findings by the internal electric fields of the substrates modulating the scattering of X-ray generated secondary electrons at the molecules.