Near-field second-harmonic imaging of magnetic domains

W Dickson, S Takahashi, D McHugh, R Atkinson, R Pollard, A V Zayats

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5 Citations (Scopus)


The principles and mechanisms of scanning near-field microscopy of second-harmonic generation from ferromagnetic films have been investigated. Magnetic domain image formation in near-field second-harmonic microscopy is discussed and the role of the probe tip is considered. It is shown that magnetic contrast can be achieved in the second-harmonic intensity measurements in both the transverse and longitudinal magnetization configurations for both polarizations of the fundamental light. This is related to the electromagnetic near-field properties in the vicinity of the probe tip and the electromagnetic interaction between a tip and a surface. The capabilities of this imaging approach have been illustrated using magnetic domain structures in thin Co and Ni films. The near-field second-harmonic distributions obtained with p-polarized excitation light are strongly correlated to the topography of the films. At the same time, the images obtained with s-polarized excitation light are much less sensitive to the topography.

Original languageEnglish
Article number033505
Number of pages7
JournalJournal of Applied Physics
Issue number3
Publication statusPublished - 1 Feb 2005


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