Quantum mechanics

Magnetic field

Chemical physics

Magnetization

Antiferromagnetism

Metallurgy

Materials science

Ferromagnetism

Coupling (piping)

Molecule

Magnetism

Inductive coupling

Physics

Nanotechnology

Organic chemistry

van der Waals force

Condensed matter physics

Exchange bias

Chemistry

Magnetic anisotropy

Spintronics

Magnet

Nano Letters

van der Waals (vdW) magnetic materials provide an ideal platform to study low-dimensional magnetism. However, observations of magnetic characteristics of these layered materials truly distinguishing them from conventional magnetic thin film systems have been mostly lacking. In an effort to investigate magnetic properties unique to vdW magnetic materials, we examine the exchange bias effect, a magnetic phenomenon emerging at the ferromagnetic-antiferromagnetic interface. Exchange bias is observed in the naturally oxidized vdW ferromagnet Fe3GeTe2, owing to an antiferromagnetic ordering in the surface oxide layer. Interestingly, the magnitude and thickness dependence of the effect is unlike those expected in typical thin-film systems. We propose a possible mechanism for this behavior, based on the weak interlayer magnetic coupling inherent to vdW magnets, demonstrating the distinct properties of these materials. Furthermore, the robust and sizable exchange bias for vdW magnets persisting up to relatively high temperatures presents a significant advance for realizing practical two-dimensional spintronics.

Exchange Bias in Weakly Interlayer-Coupled van der Waals Magnet Fe<sub>3</sub>GeTe<sub>2</sub>

Exchange Bias in Weakly Interlayer-Coupled van der Waals Magnet Fe3GeTe2

Exchange Bias in Weakly Interlayer-Coupled van der Waals Magnet Fe₃GeTe₂