Fig. 3


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(a) Measured force map of a sharply focused APB using PiFM, which exhibits a certain tip-induced anisotropy. (b) Corrected intensity distribution from the fitted model, removing tip anisotropy and noise [8]. (c) Retrieved electric and magnetic field of the sharply focused APB normalized to its maximum value. The highlighted magnetic dominant region is defined as when the normalized local field admittance FY = η|Hz/Eρ| > 10, where η is the free space impedance [8,14,16].

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