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Probing magnetism in atomically thin semiconducting PtSe₂.

Ahmet Avsar^1,2, Cheol-Yeon Cheon^3,4, Michele Pizzochero⁵

¹Electrical Engineering Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, 1015, Switzerland. ahmet.avsar@epfl.ch.

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|September 24, 2020

Summary

This summary is machine-generated.

Defects in two-dimensional platinum diselenide create magnetic ordering. This study reveals a magnetic crossover in thinned platinum diselenide, paving the way for engineered magnetism in 2D materials.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Atomic-scale disorder in 2D transition metal dichalcogenides can induce local magnetic moments.
These moments have the potential to create long-range magnetic ordering in non-magnetic materials.

Purpose of the Study:

To demonstrate long-range magnetic ordering in defective monolayer and bilayer semiconducting platinum diselenide (PtSe2).
To investigate the magnetic behavior as PtSe2 thickness is reduced.
To explore the use of graphene as a probe for magnetization in adjacent PtSe2.

Main Methods:

Magnetoresistance measurements in lateral and vertical configurations.
First-principles calculations.
Aberration-corrected transmission electron microscopy for defect imaging.

Main Results:

Observed signatures of long-range magnetic ordering in defective mono- and bi-layer PtSe2.
Identified a ferromagnetic-to-antiferromagnetic crossover as PtSe2 thickness decreases from bilayer to monolayer.
Demonstrated graphene's effectiveness in probing the magnetization of adjacent PtSe2.

Conclusions:

The observed magnetic crossover is attributed to the interplay between defect-induced magnetism and interlayer interactions in PtSe2.
This behavior is opposite to that seen in CrI3, a prototypical 2D magnet.
Findings provide a foundation for atom-by-atom engineering of magnetism in non-magnetic 2D materials at the monolayer scale.