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arXiv · 1511.03365

Photoinduced demagnetization and insulator-to-metal transition in ferromagnetic insulating BaFeO$_3$ thin films

T. Tsuyama·S. Chakraverty·N. Pontius·C. Schussler-Langeheine·H. Y. Hwang·Y. Tokura·H. Wadati
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Abstract

We studied the electronic and magnetic dynamics of ferromagnetic insulating BaFeO3 thin films by using pump-probe time-resolved resonant x-ray reflectivity at the Fe 2p edge. By changing the excitation density, we found two distinctly different types of demagnetization with a clear threshold behavior. We assigned the demagnetization change from slow (~ 150 ps) to fast (< 70 ps) to a transition into a metallic state induced by laser excitation. These results provide a novel approach for locally tuning magnetic dynamics. In analogy to heat assisted magnetic recording, metallization can locally tune the susceptibility for magnetic manipulation, allowing to spatially encode magnetic information.

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T. Tsuyama, S. Chakraverty, N. Pontius, C. Schussler-Langeheine, H. Y. Hwang, Y. Tokura, H. Wadati. 2015-11-11. Photoinduced demagnetization and insulator-to-metal transition in ferromagnetic insulating BaFeO$_3$ thin films. https://doi.org/10.1103/physrevlett.116.256402

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