Magnetism in nanometer-thick magnetite
Matteo Monti, Benito Santos, Arantzazu Mascaraque, Oscar Rodr\'iguez, de la Fuente, Miguel Angel Ni\~no, Tevik Onur Mente\c{s}, Andrea Locatelli,, Kevin F. McCarty, Jose F. Marco, Juan de la Figuera
TL;DR
This study demonstrates that magnetite films as thin as two unit cells can retain ferrimagnetism at high temperatures, advancing their potential use in spintronics.
Contribution
The paper reports the growth and in situ characterization of one-nanometer-thick magnetite crystals, showing they maintain ferrimagnetism at elevated temperatures.
Findings
Magnetite nanocrystals as thin as 1 nm retain ferrimagnetism.
Magnetic patterns observed up to 520 K.
Establishment of ferrimagnetism in two-unit-cell-thick magnetite.
Abstract
The oldest known magnetic material, magnetite, is of current interest for use in spintronics as a thin film. An open question is how thin can magnetite films be and still retain the robust ferrimagnetism required for many applications. We have grown one-nanometer-thick magnetite crystals and characterized them in situ by electron and photoelectron microscopies including selected-area x-ray circular dichroism. Well-defined magnetic patterns are observed in individual nano-crystals up to at least 520 K, establishing the retention of ferrimagnetism in magnetite two-unit-cells thick.
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