Scientists achieve highest-resolution MRI of a magnet

Scientists achieve highest-resolution MRI of a magnet: "The combination technique that the Ohio State researchers invented is called 'scanned probe ferromagnetic resonance imaging,' or scanned probe FMRI, and it involves detecting a magnetic signal using a tiny silicon bar with an even tinier magnetic probe on its tip.
In Nature, they report a successful demonstration of the technique, as they imaged the inside of the magnetic disk 0.2 micrometers (200 nanometers) at a time. They used a thin film of a commercially available nickel-iron magnetic alloy called Permalloy for the disk."