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<span style="font-size: 12pt;" data-mce-style="font-size: 12pt;">CEMS
</span>seminar - joint IRB & IoP seminar<span
style="font-size: 12pt;" data-mce-style="font-size: 12pt;">,<span>
</span></span>Thursday 7th July 2022 at 11:00, IRB 3rd wing,
lecture hall <strong></strong><br>
<br>
<div><span style="color: #55913c; font-family: times new roman,
new york, times, serif;"><span style="font-size: 21.3333px;"
data-mce-style="font-size: 21.3333px;"></span></span><span
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style="color: #55913c; font-family: times new roman, new york,
times, serif;"><span style="font-size: 21.3333px;"
data-mce-style="font-size: 21.3333px;"><b>Two-dimensional
magnetism in layered minerals</b></span></span><span
style="color: #55913c; font-family: times new roman, new york,
times, serif;"><span style="font-size: 21.3333px;"
data-mce-style="font-size: 21.3333px;"></span></span></div>
<div><b style="color: #000000; font-family: arial, helvetica,
sans-serif; font-size: 18.6667px;" data-mce-style="color:
#000000; font-family: arial, helvetica, sans-serif; font-size:
18.6667px;">Christian Teichert</b><br>
</div>
<div><span style="font-family: sans-serif;"><span
style="font-size: 14.6667px;" data-mce-style="font-size:
14.6667px;"><b>Institut für Physik, Montanuniversität
Leoben, A-8700 Leoben, Austria<br>
<a class="moz-txt-link-abbreviated" href="mailto:teichert@unileoben.ac.at">teichert@unileoben.ac.at</a><br>
</b></span></span></div>
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<div align="justify">Since the first reports on intrinsically
magnetic two-dimensional (2D) materials in 2017 [1,2], the
price-to-pay for accessing their monolayers is still the lack of
ambient stability. <br>
We discovered in a mineral aggregate – mainly composed of
hematite, magnetite, and chalcopyrite – soft layers of which
macroscopic flakes easily could be peeled off that stuck to a
permanent magnet. Employing mechanical exfoliation, we succeeded
in thinning and transferring micrometer sized – mainly
hexagonally shaped – flakes to SiO2 substrates. Energy
dispersive x-ray spectroscopy (EDS) revealed magnesium and
silica as major components of the flakes. Raman spectroscopy
indicated the presence of hydroxide groups, pointing towards
talc, a hydrated magnesium phyllosilicate mineral, namely talc
(Mg3Si4O10(OH)2). Long-term EDS and Raman spectroscopy revealed
that in the flakes about 10 % of the Mg atoms are substituted by
Fe which clusters into about 20 nm regions according to scanning
transmission electron microscopy (STEM). With atomic force
microscopy, a minimum flake thickness of 1 nm was determined
indicating cleavage down to a talc monolayer. Combined magnetic
force microscopy (MFM) measurements in external out-of-plane
fields up to 0.5 T and SQUID magnetometry measurements imply
that the 2D Fe-rich talc exhibits weak ferromagnetic behavior.
The flakes are also showing long-term stability under ambient
conditions in contrast to the 2D magnets reported so far [3]. In
an outlook, it will be demonstrated that also other iron rich
phyllosilicates can serve as a platform for 2D magnetism.
<div style="color: #000000; font-family: arial, helvetica,
sans-serif; font-size: 12pt;" data-mce-style="color: #000000;
font-family: arial, helvetica, sans-serif; font-size: 12pt;"><br>
[1] C. Gong, et al., Nature 546, 265 (2017).<br>
[2] B. Huang, et al., Nature 546, 270 (2017).<br>
[3] A. Matković, et al., npj 2D Mat. Appl. 5, 94 (2021).<br>
<br>
Work is supported by FWF, Austria via 2020 START program
(grant # Y1298 N) and has been performed in collaboration
with A. Matković, M. Z. Khan, K.-P. Gradwohl, M. Kratzer O. E.
Peil, C. Gammer, R. Bakker, J. Raith (all Leoben), E.
Fisslthaler, D. Knez, F. Hofer (all Graz), and A. Sharma,
D.R.T. Zahn, G. Salvan (all Chemnitz).<br>
</div>
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<div align="justify"><strong>LOCATION:</strong> <span> </span><strong
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