# Theory of Linear Spin Wave Emission from a Bloch Domain Wall

## TL;DR

This paper develops an analytical theory describing how uniform microwave magnetic fields can excite linear exchange spin waves from a Bloch domain wall, modeled as a Schrödinger-like equation with a P"oschl-Teller potential.

## Contribution

It introduces a novel analytical framework for understanding spin wave emission from domain walls, linking the emission efficiency to the potential's aspect ratio.

## Key findings

- Emission occurs at frequencies above a threshold
- Aspect ratio influences emission efficiency
- Tailored potentials can enhance or suppress emission

## Abstract

We report an analytical theory of linear emission of exchange spin waves from a Bloch domain wall, excited by a uniform microwave magnetic field. The problem is reduced to a one-dimensional Schr\"odinger-like equation with a P\"oschl-Teller potential and a driving term of the same profile. The emission of plane spin waves is observed at excitation frequencies above a threshold value, as a result of a linear process. The height-to-width aspect ratio of the P\"oschl-Teller profile for a domain wall is found to correspond to a local maximum of the emission efficiency. Furthermore, for a tailored P\"oschl-Teller potential with a variable aspect ratio, particular values of the latter can lead to enhanced or even completely suppressed emission.