Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 41: Surface magnetism I
MA 41.8: Vortrag
Donnerstag, 15. März 2018, 11:30–11:45, EB 202
Slowing down magnetization relaxation of lanthanide phthalocyanine double and triple deckers using a thin oxide film — •Michał Studniarek1, Aparajita Singha2, Romana Baltic2, Christian Wäckerlin2, Katharina Diller2, Fabio Donati2,3,4, Yanhua Lan5, Svetlana Klyatskaya5, Mario Ruben5, Stefano Rusponi2, Harald Brune2, and Jan Dreiser1 — 1PSI, Villigen, Switzerland — 2EPFL, Lausanne, Switzerland — 3Inst. f. Basic Science, Seoul, Republic of Korea — 4Ewha Womans Univ., Seoul, Republic of Korea — 5KIT, Eggenstein-Leopoldshafen, Germany
Recently, Wäckerlin et al. demonstrated a three-Tesla magnetic hysteresis opening on a submonolayer of TbPc2 single-ion magnets (SIMs) on a thin MgO film [1] opening a new pathway for applications of surface adsorbed SIMs. To check for the generality of this approach and to grasp the role of the insulating film we performed similar experiments on DyPc2 and Tb2Pc3. X-ray circular dichroism measurements at 3 K of DyPc2 and Tb2Pc3 on MgO/Ag(100) revealed unprecedentedly large openings of magnetic hysteresis loops. However, the enhancement of the coercivity of these molecules on MgO is less pronounced compared to the one observed for TbPc2. Besides, we demonstrate an increased blocking temperature of DyPc2/MgO compared to, e.g., DyPc2/HOPG, what is not observed for TbPc2. Finally, in this talk I will discuss the effect of the substrate phonon density of states and of the molecular symmetry on the magnetization dynamics in the light of this new study.
[1] Wäckerlin et al., Adv. Mater. 28, 5142 (2016)