Aaron Gryzia
Bielefeld University
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Featured researches published by Aaron Gryzia.
Journal of Physics: Condensed Matter | 2011
Norbert Müller; Aaron Gryzia; Niklas Dohmeier; Armin Brechling; Marc Sacher; Ulrich Heinzmann; Veronika Hoeke; Erich Krickemeyer; Thorsten Glaser; Samuel Bouvron; Mikhail Fonin; M. Neumann
Properties of the manganese-based single-molecule magnet [Mn(6)(III)Cr(III)](3+) are studied. It contains six Mn(III) ions arranged in two bowl-shaped trinuclear triplesalen building blocks linked by a hexacyanochromate and exhibits a large spin ground state of S(t) = 21/2. The dominant structures in the electron emission spectra of [Mn(6)(III)Cr(III)](3+) resonantly excited at the L(3)-edge are the L(3)M(2, 3)M(2, 3), L(3)M(2, 3)V and L(3)VV Auger emission groups following the decay of the primary p(3/2) core hole state. Significant differences of the Auger spectra from intact and degraded [Mn(6)(III)Cr(III)](3+) show up. First measurements of the electron spin polarization in the L(3)M(2, 3)V and L(3)VV Auger emission peaks from the manganese constituents in [Mn(6)(III)Cr(III)](3+) resonantly excited at the L(3)-edge near 640 eV by circularly polarized synchrotron radiation are reported. In addition spin resolved Auger electron spectra of the reference substances MnO, Mn(2)O(3) and Mn(II)(acetate)(2)·4H(2)O are given. The applicability of spin resolved electron spectroscopy for characterizing magnetic states of constituent atoms compared to magnetic circular dichroism (MCD) is verified: the spin polarization obtained from Mn(II)(acetate)(2)·4H(2)O at room temperature in the paramagnetic state compares to the MCD asymmetry revealed for a star-shaped molecule with a Mn(4)(II)O(6) core at 5 K in an external magnetic field of 5 T.
Nanoscale Research Letters | 2011
Aaron Gryzia; Hans Predatsch; Armin Brechling; Veronika Hoeke; Erich Krickemeyer; Christine Derks; M. Neumann; Thorsten Glaser; Ulrich Heinzmann
We report on the characterization of various salts of [MnIII6CrIII]3+ complexes prepared on substrates such as highly oriented pyrolytic graphite (HOPG), mica, SiO2, and Si3N4. [MnIII6CrIII]3+ is a single-molecule magnet, i.e., a superparamagnetic molecule, with a blocking temperature around 2 K. The three positive charges of [MnIII6CrIII]3+ were electrically neutralized by use of various anions such as tetraphenylborate (BPh4-), lactate (C3H5O3-), or perchlorate (ClO4-). The molecule was prepared on the substrates out of solution using the droplet technique. The main subject of investigation was how the anions and substrates influence the emerging surface topology during and after the preparation. Regarding HOPG and SiO2, flat island-like and hemispheric-shaped structures were created. We observed a strong correlation between the electronic properties of the substrate and the analyzed structures, especially in the case of mica where we observed a gradient in the analyzed structures across the surface.
Nanoscale Research Letters | 2014
Aaron Gryzia; Timm Volkmann; Armin Brechling; Veronika Hoeke; Lilli Schneider; K. Kuepper; Thorsten Glaser; Ulrich Heinzmann
Monolayers and submonolayers of [MnIII6CrIII]3+ single-molecule magnets (SMMs) adsorbed on highly oriented pyrolytic graphite (HOPG) using the droplet technique characterized by non-contact atomic force microscopy (nc-AFM) as well as by Kelvin probe force microscopy (KPFM) show island-like structures with heights resembling the height of the molecule. Furthermore, islands were found which revealed ordered 1D as well as 2D structures with periods close to the width of the SMMs. Along this, islands which show half the heights of intact SMMs were observed which are evidences for a decomposing process of the molecules during the preparation. Finally, models for the structure of the ordered SMM adsorbates are proposed to explain the observations.
Journal of Physics: Conference Series | 2014
Ulrich Heinzmann; Aaron Gryzia; T Volkmann; Armin Brechling; Veronika Hoeke; Thorsten Glaser
Single molecule magnets (SMM) deposited in submonolayers and monolayers have been analyzed with respect to their structures by means of non-contact AFM (topographic as well as damping mode) and Kelvin Probe Force Microscopy with molecular resolution.
Journal of Physics: Conference Series | 2014
Ulrich Heinzmann; Niklas Dohmeier; Norbert Müller; Aaron Gryzia; Armin Brechling; Veronika Hoeke; Erich Krickemeyer; Thorsten Glaser; Mikhail Fonin; Samuel Bouvron; P. Leicht; Thomas Tietze; E. Goering; K. Kuepper
It is demonstrated that local magnetic moments of single molecule magnets (SMM) normally studied by XMCD at very low temperatures and high magnetic fields can be measured by means of spin-resolved electron emission in the paramagnetic phase at room temperature by use of circularly polarized radiation.
Journal of Physics: Conference Series | 2012
Ulrich Heinzmann; Aaron Gryzia; Niklas Dohmeier; Hans Predatsch; Armin Brechling; Norbert Müller; Marc Sacher; Veronika Hoeke; Erich Krickemeyer; Thorsten Glaser; Samuel Bouvron; Mikhail Fonin; M Neumann
The ionic single-molecule-magnet [MnIII6CrIII]3 with corresponding three counterions has been deposited on different surfaces and studied with respect to its structure and its electronic and magnetic properties. This is the first time that spin polarization of photoelectrons ejected by means of circularly polarized synchrotron radiation has been measured in a single-molecule-magnet.
Journal of Electron Spectroscopy and Related Phenomena | 2012
Marc Sacher; Aaron Gryzia; Alexander Harder; Armin Brechling; Norbert Müller; Ulrich Heinzmann; Veronika Hoeke; Erich Krickemeyer; Thorsten Glaser; Samuel Bouvron; Mikhail Fonin
Magnetochemistry | 2016
Niklas Dohmeier; Norbert Müller; Aaron Gryzia; Armin Brechling; Ulrich Heinzmann; Maik Heidemeier; Erich Krickemeier; Anja Stammler; Hartmut Bögge; Thorsten Glaser; Loïc Joly; K. Kuepper
Journal of Electron Spectroscopy and Related Phenomena | 2015
Niklas Dohmeier; Norbert Müller; Aaron Gryzia; Armin Brechling; Ulrich Heinzmann; Veronika Hoeke; Erich Krickemeyer; Thorsten Glaser; Philipp Leicht; Mikhail Fonin; Thomas Tietze; L. Joly; K. Kuepper
Thin Solid Films | 2009
Jawad Slieh; Andreas Winter; Aaron Gryzia; Armin Brechling; Wiebke Hachmann; Simone Jacob; Andrea Kandlbinder; Karl-Josef Dietz; Ulf Kleineberg; Ulrich Heinzmann