Nanosheets of Metastable and Metamagnetic EuSe2
Salah Eddin El Jamal, Orlando C. Stewart, Tyler Hartman, Joel Swanson, Cheyenne Orozco, Sarah L. Stoll
TL;DR
Researchers synthesized two-dimensional nanosheets of EuSe2 and studied their unique magnetic properties.
Contribution
The paper introduces a method to synthesize metastable EuSe2 nanosheets and reveals their anisotropic magnetic behavior.
Findings
EuSe2 nanosheets exhibit easy-axis antiferromagnetism along the c-axis.
The metamagnetic transition critical field is lower in nanosheets compared to bulk material.
Néel temperature in nanosheets is close to that of the bulk material.
Abstract
We have identified solution conditions for synthesizing the metastable and metamagnetic semiconductor europium dichalcogenide, EuSe2, as two-dimensional nanosheets. We demonstrated phase control (EuSe or EuSe2) as well as shape control (blocks or nanosheets) and investigated the mechanism of nanosheet growth. The materials were characterized structurally using powder diffraction and microscopy (scanning electron microscopy, transmission electron microscopy, atomic force microscopy) as well as optical methods (UV–visible spectroscopy and Raman spectroscopy). The most interesting were the anisotropic magnetic nanosheet properties, both χ(T) and M(H). Using drop-cast films with high preferred orientation, it was possible to determine differences in the nanosheet magnetic properties both parallel and perpendicular to the plane of the nanosheet (along the c-axis). We observed easy-axis…
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Taxonomy
Topics2D Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films