Quantitative stray field imaging of a magnetic vortex core

Abstract

Thin-film ferromagnetic disks present a vortex spin structure whose dynamics, added to the small size (~10 nm) of their core, earned them intensive study. Here we use a scanning nitrogen-vacancy (NV) center microscope to quantitatively map the stray magnetic field above a 1 micron-diameter disk of permalloy, unambiguously revealing the vortex core. Analysis of both probe-to-sample distance and tip motion effects through stroboscopic measurements, allows us to compare directly our quantitative images to micromagnetic simulations of an ideal structure. Slight perturbations with respect to the perfect vortex structure are clearly detected either due to an applied in-plane magnetic field or imperfections of the magnetic structures. This work demonstrates the potential of scanning NV microscopy to map tiny stray field variations from nanostructures, providing a nanoscale, non-perturbative detection of their magnetic texture.

5 pages, 4 figures

References in corpus (5)

• Stray-field imaging of magnetic vortices with a single diamond spin
• Realtime magnetic field sensing and imaging using a single spin in diamond
• A Frequency-Controlled Magnetic Vortex Memory
• Single Defect Center Scanning Near-Field Optical Microscopy on Graphene
• Coherent, mechanical control of a single electronic spin

Cited by in corpus (9)

• The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry
• Measuring the magnetic moment density in patterned ultrathin ferromagnets with submicron resolution
• Fast, nanoscale addressability of nitrogen-vacancy spins via coupling to a dynamic ferromagnetic vortex
• Probing a spin transfer controlled magnetic nanowire with a single nitrogen-vacancy spin in bulk diamond
• Enhancing Optical Readout from Diamond AFM Tips for Quantum Nanosensing
• NV-center imaging of bubble domains in a 6 Å film of cobalt with perpendicular magnetization
• Magnetic noise from ultra-thin abrasively deposited materials on diamond
• Scanning Diamond NV Center Probes Compatible with Conventional AFM Technology
• Diamond spin sensors: A new way to probe nanomagnetism