Quantum Sensing of Spin Transport Properties of an Antiferromagnetic Insulator

Abstract

Antiferromagnetic insulators (AFIs) are of significant interest due to their potential to develop next-generation spintronic devices. One major effort in this emerging field is to harness AFIs for long-range spin information communication and storage. Here, we report a non-invasive method to optically access the intrinsic spin transport properties of an archetypical AFI α-Fe2O3 via nitrogen-vacancy (NV) quantum spin sensors. By NV relaxometry measurements, we successfully detect the time-dependent fluctuations of the longitudinal spin density of α-Fe2O3. The observed frequency dependence of the NV relaxation rate is in agreement with a theoretical model, from which an intrinsic spin diffusion constant of α-Fe2O3 is experimentally measured in the absence of external spin biases. Our results highlight the significant opportunity offered by NV centers in diagnosing the underlying spin transport properties in a broad range of high-frequency magnetic materials, which are challenging to access by more conventional measurement techniques.

References in corpus (9)

• Probing magnetism in 2D materials at the nanoscale with single spin microscopy
• Subterahertz spin pumping from an insulating antiferromagnet
• Purely Antiferromagnetic Magnetoelectric Random Access Memory
• Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
• Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
• Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect
• Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor
• Sensing chiral magnetic noise via quantum impurity relaxometry
• Current-induced fragmentation of antiferromagnetic domains

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• Probing GHz Spin Dynamics Across Magnetic Phase Transitions in CrCl3 Nanoflakes Using Nitrogen-Vacancy Microscopy
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