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MFM measurements. MFM images of upright standing ZnO:Mn (Mn15%) NRs measured by MFM tip with opposite polarity of apex, north (N) or south (S) (a–d). Arrow in b shows 2d bottom layer. e Represents diametric profiles of magnetic field gradients (shift of MFM tip oscillation frequency) over top of NRs collected by north (curve 1) and south (curve 2) magnetized MFM tip apex
