Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals
Abstrak
Magnetic monolayers show great promise for future applications in nanoelectronics, data storage, and sensing. The research in magnetic two‐dimensional (2D) materials focuses on synthetic iodides and tellurides, which suffer from a lack of ambient stability. So far, naturally occurring layered magnetic materials have been overlooked. These minerals offer a unique opportunity to explore complex air‐stable layered systems with high concentration of magnetic ions. Magnetic ordering in iron‐rich phyllosilicates is demonstrated, focusing on minnesotaite, annite, and biotite. These naturally occurring layered materials integrate local moment baring ions of iron via magnesium/aluminum substitution in their octahedral sites. Self‐inherent capping by silicate/aluminate tetrahedral groups enables air stability of ultra‐thin layers. Their structure and iron oxidation states are determined via Raman and X‐ray spectroscopies. Superconducting quantum interference device magnetometry measurements are performed to examine the magnetic ordering. Paramagnetic or superparamagnetic characteristics at room temperature are observed. Below 40 K ferrimagnetic or antiferromagnetic ordering occurs. In‐field magnetic force microscopy on exfoliated flakes confirms that the paramagnetic response at room temperature persists down to monolayers. Further, a correlation between the mixture of the oxidation states of iron and the critical ordering temperature is established, indicating a path to design materials with higher critical temperatures via oxidation state engineering.
Topik & Kata Kunci
Penulis (36)
Muhammad Zubair Khan
O. Peil
Apoorva Sharma
O. Selyshchev
S. Valencia
F. Kronast
Maik Zimmermann
M. A. Aslam
J. Raith
C. Teichert
D. Zahn
G. Salvan
Aleksandar Matkovi'c Chair of Physics
D. Physics
Mechanics
Electrical Engineering
Montanuniversitat Leoben
8700
Leoben
A. GmbH
Austria. Semiconductor Physics
Chemnitz University of Technology
D-09107
Chemnitz
Germany. Department of Spin
Topology in Quantum Materials
Helmholtz-Zentrum Berlin
15 Albert-Einstein-Str.
D-12489
Berlin
Germany. Chair of Resource Mineralogy
Austria. Centre for Materials
Architecture
Integration of Nanomembranes
09126
Germany
Akses Cepat
- Tahun Terbit
- 2023
- Bahasa
- en
- Total Sitasi
- 9×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1002/apxr.202300070
- Akses
- Open Access ✓