Van der Waals Magnetic Electrode Transfer for Two-Dimensional Spintronic Devices

TL;DR

This paper introduces a solvent-free magnetic electrode transfer method using graphene, enabling high-quality 2D spintronic devices with improved interfaces and performance, applicable to various device geometries.

Contribution

The study presents a novel graphene-assisted magnetic electrode transfer technique that enhances interface quality and device performance in 2D spintronics.

Findings

Successful fabrication of high-performance 2D spin valves

Applicability to both two-terminal and four-terminal device geometries

Enhanced spin injection efficiency and interface quality

Abstract

Two-dimensional (2D) materials are promising candidates for spintronic applications. Maintaining their atomically smooth interfaces during integration of ferromagnetic (FM) electrodes is crucial since conventional metal deposition tends to induce defects at the interfaces. Meanwhile, the difficulties in picking up FM metals with strong adhesion and in achieving conductance match between FM electrodes and spin transport channels make it challenging to fabricate high-quality 2D spintronic devices using metal transfer techniques. Here, we report a solvent-free magnetic electrode transfer technique that employs a graphene layer to assist in the transfer of FM metals. It also serves as part of the FM electrode after transfer for optimizing spin injection, which enables the realization of spin valves with excellent performance based on various 2D materials. In addition to two-terminal devices, we demonstrate that the technique is applicable for four-terminal spin valves with nonlocal geometry. Our results provide a promising future of realizing 2D spintronic applications using the developed magnetic electrode transfer technique.