# Isofrequency spin-wave imaging using color center magnetometry for magnon spintronics

## TL;DR

This paper introduces a new method for imaging spin waves using color center magnetometry, overcoming previous limitations to enable better control and understanding of spin-wave technologies.

## Contribution

The work introduces decoupling sensor spins from control fields and using diamond and hBN color centers for complementary frequency operation.

## Key findings

- Isofrequency imaging of field-controlled spin waves in a magnetic half-plane was demonstrated.
- Intrinsic magnetic anisotropies were shown to trigger bistable spin textures affecting spin-wave transport.
- Color center magnetometry was established as a versatile tool for spin-wave technologies.

## Abstract

Magnon spintronics aims to harness spin waves in magnetic films for information technologies. Color center magnetometry is a promising tool for imaging spin waves, using electronic spins associated with atomic defects in solid-state materials as sensors. However, two main limitations persist: the magnetic fields required for spin-wave control detune the sensor-spin detection frequency, and this frequency is further restricted by the color center nature. Here, we overcome these limitations by decoupling the sensor spins from the spin-wave control fields –selecting color centers with intrinsic anisotropy axes orthogonal to the film magnetization– and by using color centers in diamond and hexagonal boron nitride to operate at complementary frequencies. We demonstrate isofrequency imaging of field-controlled spin waves in a magnetic half-plane and show how intrinsic magnetic anisotropies trigger bistable spin textures that govern spin-wave transport at device edges. Our results establish color center magnetometry as a versatile tool for advancing spin-wave technologies.

Color center magnetometry enables spin-wave imaging in complex magnetic textures. This work overcomes key limitations of current approaches by decoupling sensor spins from control fields and using diamond and hBN color centers for complementary frequency operation, achieving isofrequency imaging of field-controlled spin waves.