Near-field magneto-caloritronic nanoscopy on ferromagnetic nanostructures

Near-field magneto-caloritronic nanoscopy on ferromagnetic nanostructures

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-calor...

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Bibliographic Details
Main Authors: E. Pfitzner, X. Hu, H. W. Schumacher, A. Hoehl, D. Venkateshvaran, M. Cubukcu, J.-W. Liao, S. Auffret, J. Heberle, J. Wunderlich, B. Kästner
Format: Article
Language:English
Published: AIP Publishing LLC 2018-12-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.5054382
Description
Summary: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.
ISSN:2158-3226

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