Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
Autoren
Organisationseinheiten
Externe Organisationseinheiten
- Materials Center Leoben Forschungs GmbH
- Technische Universität Chemnitz
- Helmholtz-Zentrum Berlin
Abstract
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.
Details
Originalsprache | Englisch |
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Aufsatznummer | 2300070 |
Fachzeitschrift | Advanced physics research |
Jahrgang | 2.2023 |
Ausgabenummer | 12 |
DOIs | |
Status | Elektronische Veröffentlichung vor Drucklegung. - 26 Juli 2023 |