Abstract
We have studied surface magnetic structure of ultrathin Cr(001) films on Au(001) at room temperature by using spin-polarized scanning tunneling spectroscopy. Spatially resolved maps of the magnetic differential conductivity signal measured with Fe-coated W tips exhibit the following features: (1) Topological antiferromagnetic order appears in a series of adjacent terraces. (2) Domains exist with different quantization axes. (3) Narrow domain walls $(\ensuremath{\sim}6\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ are found near screw dislocations. Feature (2) may be determined by the effective uniaxial anisotropy induced by the step direction. Feature (3) can be explained by considering the shorter distance between screw dislocations than the exchange length $(\ensuremath{\sim}120\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ as a result of high-density dislocations in the Cr films.
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