Observation of plateau-like magnetoresistance in twisted Fe3GeTe2/Fe3GeTe2 junction

TL;DR

This study reports the first observation of plateau-like magnetoresistance in a twisted Fe3GeTe2/Fe3GeTe2 van der Waals homojunction, revealing new magnetic transport phenomena and potential for spintronics applications.

Contribution

It introduces a twisted magnetic vdW homostructure with broken symmetry and demonstrates its unique magnetoresistance behavior, expanding the understanding of magnetic transport in vdW materials.

Findings

Plateau-like magnetoresistance observed in twisted Fe3GeTe2/Fe3GeTe2 junction.

Magnetoresistance ratio ~0.05%, increasing with decreasing temperature.

The junction exhibits metallic behavior with no spacer layer.

Abstract

Controlling the stacking of van der Waals (vdW) materials is found to produce exciting new findings, since hetero- or homo- structures have added the diverse possibility of assembly and manipulated functionalities. However, so far, the homostructure with a twisted angle based on the magnetic vdW materials remains unexplored. Here, we achieved a twisted magnetic vdW Fe3GeTe2/Fe3GeTe2 junction with broken crystalline symmetry. A clean and metallic vdW junction is evidenced by the temperature-dependent resistance and the linear I-V curve. Unlike the pristine FGT, a plateau-like magnetoresistance (PMR) is observed in the magnetotransport of our homojunction due to the antiparallel magnetic configurations of the two FGT layers. The PMR ratio is found to be ~0.05% and gets monotonically enhanced as temperature decreases like a metallic giant magnetoresistance (GMR). Such a tiny PMR ratio is at least three orders of magnitude smaller than the tunneling magnetoresistance (TMR) ratio, justifying our clean metallic junction without a spacer. Our findings demonstrate the feasibility of the controllable homostructure and shed light on future spintronics using magnetic vdW materials.