Direct observation and imaging of a spin-wave soliton with $p-$like symmetry

TL;DR

This paper reports the direct observation of a novel $p$-like symmetry spin-wave soliton in magnetic nanodevices, revealing new insights into non-linear spin-wave excitations for advanced magnetic information processing.

Contribution

It introduces the first experimental evidence of a $p$-like localized spin-wave soliton, challenging the previous assumption of cylindrical symmetry in such excitations.

Findings

Observation of $p$-like symmetry soliton with a nodal line

Micromagnetic simulations explaining the $s$ to $p$ transition

Potential for designing tunable magnetic nano-devices

Abstract

The prediction and realization of magnetic excitations driven by electrical currents via the spin transfer torque effect, enables novel magnetic nano-devices where spin-waves can be used to process and store information. The functional control of such devices relies on understanding the properties of non-linear spin-wave excitations. It has been demonstrated that spin waves can show both an itinerant character, but also appear as localized solitons. So far, it was assumed that localized solitons have essentially cylindrical, $s-$like symmetry. Using a newly developed high-sensitivity time-resolved magnetic x-ray microscopy, we instead observe the emergence of a novel localized soliton excitation with a nodal line, i.e. with $p-$like symmetry. Micromagnetic simulations identify the physical mechanism that controls the transition from $s-$ to $p-$like solitons. Our results suggest a potential new pathway to design artificial atoms with tunable dynamical states using nanoscale magnetic devices.