Giant orbital-magnon conversion driven perpendicular magnetization switching

TL;DR

This paper demonstrates a novel orbital-magnon conversion mechanism enabling efficient perpendicular magnetization switching at room temperature, bridging orbitronics and magnonics for advanced nano-device development.

Contribution

It reports the first experimental demonstration of orbital-to-magnon conversion in an orbital metal/antiferromagnetic insulator bilayer at room temperature, with high efficiency.

Findings

Achieved orbital-magnon conversion with over tenfold efficiency increase.

Demonstrated room-temperature perpendicular magnetization switching.

Established a direct link between orbitronics and magnonics.

Abstract

The pursuit of beyond-Moore information technologies has stimulated the exploration of novel information carriers, such as electron spin, orbital, and magnon, beyond electron charge. Efficient interconversion among these degrees of freedom and precise control over the information states are crucial for advancing nanoelectronic devices. However, a direct coupling between orbital angular momentum (L) and magnons (M) has remained elusive, and magnetization switching through orbital-to-magnon (L-M) conversion has not yet been achieved. Here, we report the experimental demonstration of L-M conversion in an orbital metal/antiferromagnetic insulator bilayer at room temperature, with an efficiency over an order of magnitude higher than that in traditional orbital systems lacking the L-M process. Consequently, we achieved efficient room-temperature perpendicular magnetization switching in a CoFeB ferromagnetic layer mediated by this new mechanism. Our findings establish a direct link between orbitronics and magnonics, providing a new platform for the development of advanced nano-devices based on orbital-driven magnonic phenomena.