Micrometry: Ultrasensitive Optomechanical Magnetometry (Adv. Mater. 36/2014)

An array of micro‐magnetometers made from a magnetostrictive material embedded inside a silica toroid is shown, along with light that is coupled into one of them. On page 6348, W. P. Bowen and co‐workers report that such devices may facilitate significant applications, such as medical diagnosis with microscale samples using microfluidic NMR, direct measurement of dynamics in spin systems, magnetic mapping of single neurons grown on‐chip, and low‐field MRI for room‐temperature, portable, and high‐resolution imaging at low cost.