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Apertureless scanning near‐field magneto‐optical microscopy of magnetic multilayers

We imaged magnetic domains in Pt/Co/Pt multilayers using an apertureless scanning near‐field optical microscope operating in reflection mode. As the magneto‐optical effects are weak for this kind of structure, a polarization modulation technique with a photoelastic modulator was used to reveal the contrast between magnetic domains. In the case of a Pt/Co/Pt trilayer structure, a strong improvement in lateral resolution is observed compared with far‐field magneto‐optical images and good sensitivity is achieved. In the case of a Pt/[Co/Pt]Pt multilayer structure, stripe domains of 200 nm width could be resolved, in good agreement with images obtained by magnetic force microscopy on the same structure.