  Magnetic microscopy that combines nanoscale spatial resolution with
picosecond scale temporal resolution uniquely enables direct observation of the
spatiotemporal magnetic phenomena that are relevant to future high-speed,
high-density magnetic storage and logic technologies. Magnetic microscopes that
combine these metrics has been limited to facility-level instruments. To
address this gap in lab-accessible spatiotemporal imaging, we develop a
time-resolved near-field magnetic microscope based on magneto-thermal
interactions. We demonstrate both magnetization and current density imaging
modalities, each with spatial resolution that far surpasses the optical
diffraction limit. In addition, we study the near-field and time-resolved
characteristics of our signal and find that our instrument possesses a spatial
resolution on the scale of 100 nm and a temporal resolution below 100 ps. Our
results demonstrate an accessible and comparatively low-cost approach to
nanoscale spatiotemporal magnetic microscopy in a table-top form to aid the
science and technology of dynamic magnetic devices with complex spin textures.
