Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Autoren

  • Oleg Peil
  • Apoorva Sharma
  • Oleksandr Selyshchev
  • Sergio Valencia
  • Florian Kronast
  • Dietrich R. T. Zahn
  • Georgeta Salvan
  • Aleksandar Matković

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

OriginalspracheEnglisch
Aufsatznummer2300070
FachzeitschriftAdvanced physics research
Jahrgang2.2023
Ausgabenummer12
DOIs
StatusElektronische Veröffentlichung vor Drucklegung. - 26 Juli 2023