Off-resonant detection of domain wall oscillations using deterministically placed nanodiamonds

Journal Article · 12 December 2023 · npj Spintronics

DOI: https://doi.org/10.1038/s44306-023-00002-3 · OSTI ID:2229807

Rable, Jeffrey; Dwivedi, Jyotirmay; Samarth, Nitin

Abstract Nitrogen-vacancy (NV) centers in diamond offer a sensitive method of measuring the spatially localized dynamics of magnetization and associated spin textures in ferromagnetic materials. We use NV centers in a deterministically positioned nanodiamond to demonstrate off-resonant detection of microwave field-driven GHz-scale oscillations of a single domain wall (DW). The technique exploits the enhanced relaxation of NV center spins due to the broadband stray field noise generated by an oscillating DW pinned at an engineered defect in a lithographically patterned ferromagnetic nanowire. Discrepancies between the observed DW oscillation frequency and predictions from micromagnetic simulations suggest extreme sensitivity of DW dynamics to patterning imperfections such as edge roughness. These experiments and simulations identify potential pathways toward quantum spintronic devices that exploit current-driven DWs as nanoscale microwave generators for qubit control, greatly increasing the driving field at an NV center and thus drastically reducing the π pulse time.

• Sponsoring Organization: USDOE
• OSTI ID: 2229807
• Journal Information: npj Spintronics, Journal Name: npj Spintronics Journal Issue: 1 Vol. 1; ISSN 2948-2119
• Publisher: Nature Publishing GroupCopyright Statement
• Country of Publication: Country unknown/Code not available
• Language: English