High-Resolution X-Ray Studies of the Direct Spin Contact of EuO with Silicon

TL;DR

This study uses advanced X-ray techniques to analyze the EuO/Si interface, demonstrating superior structural quality crucial for efficient spin injection in spintronic devices.

Contribution

It provides the first detailed structural analysis of high-quality EuO/Si interfaces achieved without buffer layers, advancing spintronics technology.

Findings

Direct coupling at the EuO/Si interface confirmed

Structural quality exceeds previous reports

Potential for improved spin injection efficiency

Abstract

Ferromagnetic semiconductor europium monoxide (EuO) is believed to be an effective spin injector when directly integrated with silicon. Injection through spin-selective ohmic contact requires superb structural quality of the interface EuO/Si. Recent breakthrough in manufacturing free-of-buffer-layer EuO/Si junctions calls for structural studies of the interface between the semiconductors. Ex situ high-resolution X-ray diffraction and reflectivity accompanied by in situ reflection high-energy electron diffraction reveal direct coupling at the interface. A combined analysis of XRD and XRR data provides a common structural model. The structural quality of the EuO/Si spin contact by far exceeds that of previous reports and thus makes a step forward to the ultimate goals of spintronics.