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Tunable magnetism at the the LaAlO₃/SrTiO₃ (LAO/STO) has been observed, but its mechanism remains unknown. Previous experimental results, such as an observed Kondo effect[1] and magnetic force microscopy (MFM) measurements[2], confirm electrically-tunable magnetism in LAO/STO at room temperature. While optical probing further characterizes this magnetic behavior as optically controllable[3], studies of the dynamics of this magnetization remain incomplete. To resolve this transition, we take advantage of magneto-optical Kerr effect (MOKE) microscopy. By by pump-and-probe optical measurements, the behavior of the system during transition can be characterized. Understanding this transition as it evolves will reveal the mechanism that controls the property and enrich our understanding of both the interface and this exotic magnetism.


[1] K. Han, et al. Sci Rep. 6, 25455 (2016).
[2] F. Bi, et al. Nat Commun 5, 5019 (2014).
[3] W. Rice, et al. Nature Mater 13, 481–487 (2014).