Measure electrical currents with Scanning NV Magnetometry

Scanning NV magnetometry is not only suited to measure tiny magnetic fields. It allows to resolve electrical currents (via their magnetic fields) with unprecedented spatial resolution. 

We here apply a current to a 100 nm thick Cr/Au u-shaped wire. The current flows through the nanostructure inducing a local magnetic field which is detected using Scanning NV Magnetometry. We show that the local current density (calculated using the magnetic fields) can be used to identify defects in the nanostructure and geometry-specific current behaviour.

This opens the pathway for using Scanning NV Magnetometry as a tool for failure analysis.  The presented measurements have been performed using Qnami ProteusQ equipped with Vario PQ.

If you want to find out more about these groundbreaking results, download the technical note here.   

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Led by Mark Ku at the University of Delaware, this work characterizes a high-quality diamond micro-chip from the Qnami Quantum Foundry for advanced, high-resolution NV-based quantum microscopy.
Nanoconfined Microwaves imaged by Rabi Oscillation Mapping

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Swastik Kar’s group at Northeastern University used AC magnetometry on the Qnami ProteusQ to show that a permalloy nanowire can be used to concentrate RF fields into sub 300nm regions.
Mapping current flow using ProteusQCurrent Flow Mapping in Ferroelectric Domain Walls

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In a recent study on conducting ferroelectric domain walls, researchers used scanning NV magnetometry to directly visualize current flow at the nanoscale. These measurements were performed using the Qnami ProteusQ. The results challenge previous assumptions about current distribution and pave the way for more accurate modeling of next-generation memristive devices.

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