Probing magnetic ordering in air stable iron-rich van der Waals minerals
Abstrak
In the rapidly expanding field of two-dimensional materials, magnetic monolayers show great promise for the future applications in nanoelectronics, data storage, and sensing. The research in intrinsically magnetic two-dimensional materials mainly focuses on synthetic iodide and telluride based compounds, which inherently suffer from the lack of ambient stability. So far, naturally occurring layered magnetic materials have been vastly overlooked. These minerals offer a unique opportunity to explore air-stable complex layered systems with high concentration of local moment bearing ions. We demonstrate magnetic ordering in iron-rich two-dimensional phyllosilicates, focusing on mineral species of minnesotaite, annite, and biotite. These are naturally occurring van der Waals magnetic materials which integrate local moment baring ions of iron via magnesium/aluminium substitution in their octahedral sites. Due to self-inherent capping by silicate/aluminate tetrahedral groups, ultra-thin layers are air-stable. Chemical characterization, quantitative elemental analysis, and iron oxidation states were determined via Raman spectroscopy, wavelength disperse X-ray spectroscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy. Superconducting quantum interference device magnetometry measurements were performed to examine the magnetic ordering. These layered materials exhibit paramagnetic or superparamagnetic characteristics at room temperature. At low temperature ferrimagnetic or antiferromagnetic ordering occurs, with the critical ordering temperature of 38.7 K for minnesotaite, 36.1 K for annite, and 4.9 K for biotite. In-field magnetic force microscopy on iron bearing phyllosilicates confirmed the paramagnetic response at room temperature, present down to monolayers.
Topik & Kata Kunci
Penulis (49)
Muhammad Zubair Khan
Oleg E. Peil
Apoorva Sharma
Oleksandr Selyshchev
Sergio Valencia
Florian Kronast
Maik Zimmermann
Muhammad Awais Aslam
Johann G. Raith
Christian Teichert
Dietrich R. T. Zahn
Georgeta Salvan
Aleksandar Matković
Chair of Physics
Department Physics
Mechanics
Electrical engineering
Montanuniversität Leoben
8700
Leoben
Austria.
Materials Center Leoben Forschung GmbH
8700
Leoben
Austria.
Semiconductor Physics
Chemnitz University of Technology
D-09107
Chemnitz
Germany.
Department of Spin
Topology in Quantum Materials
Helmholtz-Zentrum Berlin
Albert-Einstein-Str. 15
D-12489
Berlin
Germany.
Chair of Resource Mineralogy
Montanuniversität Leoben
8700
Leoben
Austria.
Centre for Materials
Architecture
Integration of Nanomembranes
Chemnitz University of Technology
09126
Chemnitz
Germany
Akses Cepat
- Tahun Terbit
- 2023
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- arXiv
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- Open Access ✓