Unveiling Critical Behavior in High-Tc Ferromagnets with NV Magnetometry

Image credit: https://pubs.acs.org/doi/10.1021/acs.nanolett.4c05401

As magnetic materials approach their Curie temperature (Tc), they exhibit critical behavior, including divergent susceptibilities, long-range correlations, and spin dynamics across a wide frequency range. However, capturing these effects at the relevant length and time scales has remained challenging.

In research led by Benjamin Lawrie at Oak Ridge National Lab, scientists used NV relaxometry on the Qnami ProteusQ system to investigate a high-Tc ferromagnetic oxide near its phase transition. Their analysis of nanoscale magnetic textures identified a 3D universality class for static correlations, while optical relaxometry suggested an XY universality class for spin dynamics.

These findings provide new insights into phase transitions in magnetic materials and demonstrate the potential of scanning NV magnetometry for exploring critical phenomena at the nanoscale.

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Magnetic map of a FEBID Cobalt nanomagnet taken with ProteusQ the Qnami Scanning NV MicroscopeFEBID Nanomagnets for Spin Qubit Control

FEBID Nanomagnets for Spin Qubit Control

Combining FEBID and Scanning NV Microscopy, researchers fabricated and characterized Cobalt nanomagnets for spin Qubit control.
Room-Temperature Skyrmions at Zero Field in Exchange-Biased Ultrathin Films – Physical Review Applied

Room-Temperature Skyrmions at Zero Field in Exchange-Biased Ultrathin Films – Physical Review Applied

Team led by Dr. O. Boulle demonstrates skyrmions stable at room temperature and with a radius 10x smaller than previously reported.
Representation of the experimental setup to study the effect of superconductivity on spin waves in YIG thin layers.Spin waves and superconductivity

Spin waves and superconductivity

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By using wide field NV magnetometry, researchers showed for the first time that superconductors can be used to manipulate spin waves.

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