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Researchers in spintronics seek to harness the spins of electrons to efficiently manipulate magnetization, for digital logic and data-storage applications. It is a challenge, however, to develop an instrument both fast and sensitive enough to track microscopic magnetic dynamics. The authors demonstrate an approach based on ultrafast laser heating to simultaneously image magnetic orientation and electric current, capturing the dynamics of both at gigahertz frequencies. This could be used to directly study current-induced torques in magnetic deviceschar22{}a boon to both basic research and working technology.

Phase-Sensitive Imaging of Ferromagnetic Resonance Using Ultrafast Heat Pulses