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Spin Resolution and Evidence for Superexchange on NiO(001) Observed by Force Microscopy

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Pielmeier, Florian ; Giessibl, Franz J.
Date of publication of this fulltext: 26 Jun 2013 06:12


The spin order of the nickel oxide (001) surface is resolved, employing noncontact atomic force microscopy at 4.4 K using bulk Fe and SmCo tips mounted on a qPlus sensor that oscillates at sub-50 pm amplitudes. The spin-dependent signal is hardly detectable with Fe tips. In contrast, SmCo tips yield a height contrast of 1.35 pm for Ni ions with opposite spins. SmCo tips even show a small height ...


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