Searching atomic spin contrast on nickel oxide (001) by force microscopy

Details Searching atomic spin contrast on nickel oxide (001) by force microscopy Searching atomic spin contrast on nickel oxide (001) by force microscopy

2006-03-21

arxiv.org/abs/cond-mat/0603547v2

Phys. Rev. B 77, 045402 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.77.045402

The (001) surface of NiO, an antiferromagnet at room temperature, was investigated under ultra-high vacuum conditions with frequency modulation atomic force microscopy (FM-AFM). The antiferromagnetic coupling between ions leads to a spin superstructure on (001) surfaces. Exchange interaction between the probe of a force microscope and the NiO (001) surface should allow to image spin superstructures in real space. The surface was imaged with three different probing tips: nonmagnetic W tips, ferromagnetic Co tips and antiferromagnetic NiO tips - and atomic resolution was achieved with all three of them in various distance regimes and in several channels. Evidence for spin contrast was obtained in experiments that utilize NiO tips and oscillation amplitudes in the \AA-regime, where optimal signal-to-noise ratio is expected. The spin contrast is weaker than expected and only visible in Fourier space images.

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