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arXiv · 1808.10767

Near-field magneto-caloritronic nanoscopy on ferromagnetic nanostructures

E. Pfitzner·X. Hu·H. W. Schumacher·A. Hoehl·D. Venkateshvaran·M. Cubukcu·J. -W. Liao·S. Auffret·J. Heberle·J. Wunderlich·B. Kaestner
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Abstract

Near-field optical microscopy by means of infrared photocurrent mapping has rapidly developed in recent years. In this letter we introduce a near-field induced contrast mechanism arising when a conducting surface, exhibiting a magnetic moment, is exposed to a nanoscale heat source. The magneto-caloritronic response of the sample to near-field excitation of a localized thermal gradient leads to a contrast determined by the local state of magnetization. By comparing the measured electric response of a magnetic reference sample with numerical simulations we derive an estimate of the field enhancement and the corresponding temperature profile induced on the sample surface.

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E. Pfitzner, X. Hu, H. W. Schumacher, A. Hoehl, D. Venkateshvaran, M. Cubukcu, J. -W. Liao, S. Auffret, J. Heberle, J. Wunderlich, B. Kaestner. 2018-08-31. Near-field magneto-caloritronic nanoscopy on ferromagnetic nanostructures. https://doi.org/10.1063/1.5054382

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