3–6 Jul 2017
Europe/Warsaw timezone

Between single ion magnets and macromolecules: self-organizing, polymer-transition metal based macromolecular magnetic semi-solid solution

4 Jul 2017, 17:30
20m
oral presentation Multifunctional materials Multifunctional Materials I

Speaker

Dr Anna Majcher (Institute of Physics, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland)

Description

`We present a new approach to obtain functional magnetic materials: one that combines the qualities of polymers that are widely used to produce thin films, and Single Ion Magnets that exhibit magnetic relaxations.$^{[1]}$ By reactions of pyridine and 4-vinylpyridine with CoBr$_2$, we obtained two SIMs, showing field-induced relaxations of magnetization with energy barriers of 28(2) and 35(3) K, and $\tau_0$ values of $8\cdot 10^{-10}$ s and $1\cdot 10^{-11}$ s, respectively. Next, resulting from a reaction of poly(4-vinylpyridine) (P4VP), with its structural units identical to the ligands used to form the SIMs, with CoBr$_2$, a new material was formed with CoBr$_2$ bound to the pyridines within the polymer chains, forming a cross-linked macromolecular matrix. Field-induced relaxations of magnetization are preserved and dependent on the Co:P4VP structural units molar ratio, making it an amorphous semi-solid solution. Thin magnetic films were obtained by immersion of P4VP spin-cast films in CoBr$_2$ orthogonal solution. Atomic Force Microscopy (see figure, middle), Secondary Ion Mass Spectrometry and X-ray Photoelectron Spectroscopy confirm the binding of cobalt salts within the layer. AC magnetic measurements confirm the preservation of magnetic relaxations in the film. We believe that our research opens a new path that combines two fields of material research and is extremely promising regarding future applications of molecular magnets – as self-organizing macromolecular magnetic materials.` `This research was financed by the Polish National Science Centre within the SONATA Project UMO-2015/19/D/ST5/01936.` [1] G. A. Craig, M. Murrie, `$\textit{Chem. Soc. Rev.}$`, 2015, `$\textbf{44}$`, 2135-2147.

Primary author

Dr Anna Majcher (Institute of Physics, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland)

Co-authors

Dr Andrzej Bernasik (Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-049 Kraków, Poland) Dr Jakub Rysz (Institute of Physics, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland) Ms Magdalena Ceglarska (Institute of Physics, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland) Dr Mateusz M. Marzec (Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. Mickiewicza 30, 30-049 Kraków, Poland) Dr Olaf Stefańczyk (Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) Mr Paweł Dąbczyński (Institute of Physics, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland) Prof. Shin-ichi Ohkoshi (Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan)

Presentation materials

There are no materials yet.