Exploring terahertz emission in FeGa ferromagnetic material.

Mr. Nan Zhang
National University of Singapore, Singapore, Singapore. AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH (A*STAR), Singapore, Singapore. Anor Technologies Pte Ltd, Singapore, Singapore


Spintronic terahertz (THz) emitters, based on spintronics principles, have recently emerged as a cost-effective and robust technology for THz generation. Their broad bandwidth and robustness make them increasingly popular, especially when compared to conventional THz emission methods like Photoconductive Antennas (PCAs), crystal-based emitters, and gas plasma techniques. One of the key challenges is outperforming these traditional methods.

Our research focuses on exploring ferromagnetic materials beyond Cobalt-Iron-Boron (CoFeB), which has been effective in spintronic THz emitters. We aim to find a material that not only matches the tuning capabilities of CoFeB but also offers enhanced performance.

In this context, we introduce Iron-Gallium (FeGa) as a promising candidate. Its high spin polarization and magnetic anisotropy are ideal for efficiently converting spin currents into THz radiation. FeGa alloys, known for their significant magnetostriction and high tensile strength, are resilient under various temperatures and operational conditions. Their ductility and compatibility with silicon substrates make them suitable for microscale applications.

This study presents a novel approach using FeGa in the realm of spintronics to advance THz emission technology, highlighting its potential in outperforming existing methods and its applicability in diverse environments.