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The simultaneous imaging of magnetic fields and temperature (MT) is importantin a range of applications, including studies of carrier transport, solid-statematerial dynamics, and semiconductor device characterization. Techniques existfor separately measuring temperature (e.g., infrared (IR) microscopy,micro-Raman spectroscopy, and thermo-reflectance microscopy) and magneticfields (e.g., scanning probe magnetic force microscopy and superconductingquantum interference devices). However, these techniques cannot measuremagnetic fields and temperature simultaneously. Here, we use the exceptionaltemperature and magnetic field sensitivity of nitrogen vacancy (NV) spins inconformally-coated nanodiamonds to realize simultaneous wide-field MT imaging.Our "quantum conformally-attached thermo-magnetic" (Q-CAT) imaging enables (i)wide-field, high-frame-rate imaging (100 - 1000 Hz); (ii) high sensitivity; and(iii) compatibility with standard microscopes. We apply this technique to studythe industrially important problem of characterizing multifinger galliumnitride high-electron-mobility transistors (GaN HEMTs). We spatially andtemporally resolve the electric current distribution and resulting temperaturerise, elucidating functional device behavior at the microscopic level. Thegeneral applicability of Q-CAT imaging serves as an important tool forunderstanding complex MT phenomena in material science, device physics, andrelated fields.

Wide-field Magnetic Field and Temperature Imaging using Nanoscale Quantum Sensors