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MA: Fachverband Magnetismus

MA 21: Ultrafast Magnetization II

MA 21.8: Talk

Tuesday, March 17, 2020, 11:15–11:30, HSZ 101

First-principles theory of laser-induced dynamics on the magnetic Dy₂Ni₂(DMF) complex — •Bharadwaj C. Mummaneni, Stefan Sold, Georgios Lefkidis, and Wolfgang Hübner — Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany

We study the functional role of d and f electrons in the tetra-heteronuclear Dy₂Ni₂(DMF) magnetic complex, which harbors a great potential as a magnetic-logic-element building block in future nanospintronic devices [1]. We focus on the theoretical characterization of the magnetic properties and the laser-induced spin dynamics of the complex, which adopts a defect dicubane geometry and has a ferromagnetic electronic ground state [2].

The highly correlated electronic excited states are computed with the state-of-the-art equation-of-motion coupled-cluster method and the perturbative inclusion of spin-orbit coupling. We are able to theoretically explain the experimental electronic absorption spectrum, as well as several time-resolved differential absorption spectra, after two different pump pulses (at 300 and 400 nm, respectively).

• [1] D. Chaudhuri, G. Lefkidis, and W. Hübner, Phys. Rev. B 96, 184413 (2017)
• [2] D. K. C. Mondal, G. E. Kostakis, Y. Lan, W. Wernsdorfer, C. E. Anson, and A. K. Powell, Inorg. Chem. 50, 11604 (2011)
• [3] S. Sold, G. Lefkidis, B. Kamble, J. Berakdar, and W. Hübner, Phys. Rev. B 97, 184428 (2018)