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PGI-1 Talk: Dr. Alexander B. Shick

More surprices in f-electron magnetism

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25 May 2018 11:30
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PGI Lecture Hall

Institute of Physics ASCR, Prague

Abstract:

Surface supported single magnetic atoms, the so-called "single-atom magnets", open new opportunities in a quest for the ultimate size limit of magnetic information storage. Initially, the research mainly focused on 3d-atoms on surfaces. Recently, the attention was turned to the 4f-atoms, culminating in the experimental discovery of magnetically stable Ho atom on MgO(001) substrate, and Dy atom on Graphene/Ir(111).
I address the electronic and magnetic character of 4f-atoms on metal and Graphene substrate making use of a combination of the DFT+U with the exact diagonalization of Anderson impurity model (DFT+U+ED). The spin and orbital magnetic moments of selected adatoms, Ho/Pt(111), Dy@Ir(111), and Dy/Graphene/Ir(111), are evaluated and compared with experimental XMCD data. The magnetic anisotropy energy is estimated, and the magnetic stability is discussed. The role of 5d-4f interorbital exchange polarization in modification of the 4f-shell energy spectrum is emphasized.

Contact

Prof. Dr. Stefan Blügel
Phone: +49 2461 61-4249
Fax: +49 2461 61-2850
email: s.bluegel@fz-juelich.de

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