3 years ago

Observation of layered antiferromagnetism in self-assembled parallel NiSi nanowire arrays on Si(110) by spin-polarized scanning tunneling spectromicroscopy.

Hsin-Zan Hsu, Ie-Hong Hong
The layered antiferromagnetism of parallel nanowire arrays self-assembled on Si(110) has been observed at room temperature by direct imaging of both the topographies and magnetic domains using spin-polarized scanning tunneling microscopy/spectroscopy (SP-STM/STS). The topographic STM images reveal that the self-assembled unidirectional and parallel NiSi nanowires grow into the Si(110) substrate along the [-110] direction (i.e., the endotaxial growth) and exhibit multiple-layer growth. The spatially-resolved SP-STS maps show that these parallel NiSi nanowires of different heights produce two opposite magnetic domains, depending on the heights of either even or odd layers in the layer stack of the NiSi nanowires. This layer-wise antiferromagnetic structure can be attributed to an antiferromagnetic interlayer exchange coupling between the adjacent layers in the multiple-layer NiSi NW with a B2 (CsCl-type) crystal structure. Such an endotaxial heterostructure of parallel magnetic NiSi nanowire arrays with a layered antiferromagnetic ordering in Si(110) provides a new and important perspective for the development of novel Si-based spintronic nanodevices.

Publisher URL: http://doi.org/10.1088/1361-6528/aaa6ea

DOI: 10.1088/1361-6528/aaa6ea

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