Unidirectional propagation of spin waves excited by femtosecond laser pulses in a planar waveguide

TL;DR

This paper demonstrates a method to achieve unidirectional spin wave propagation in a ferromagnetic waveguide using femtosecond laser pulses, advancing magnonic logic circuit design for data processing.

Contribution

It introduces a novel approach to realize non-reciprocal spin wave propagation via laser excitation and magnetic field control, enabling future magnonic-photonic circuit integration.

Findings

Unidirectional spin wave propagation achieved with laser excitation and magnetic field.

Micromagnetic modeling confirms control over spin wave directionality.

Potential for hybrid magnonic-photonic circuit applications.

Abstract

Low-energy magnonic logic circuits are an actively developing field of modern magnetism. The potential benefits of magnonics for data processing are vitally dependent on units based on non-reciprocal propagation of spin waves in analogy to semiconductor diodes and transistors in electronics. In this article, we suggest the approach to realize non-reciprocal propagation of spin waves in a ferromagnetic metallic waveguide by exciting them with femtosecond laser pulse. Using micromagnetic modeling, we show that the combination of an external magnetic field and the position of the excitation laser spot across the waveguide leads to unidirectional propagation of the excited spin-wave packet. The results are crucial for the design of hybrid magnonic-photonic circuits in future generations of data processing devices.