Oriented arrays of iron nanowires: synthesis, structural and magnetic aspects
Iron nanowires with the diameter of ca. 40 nm and a length up to few dozens of microns are fabricated via templated electrodeposition using anodic aluminum oxide (AAO) film as porous matrix. Despite polycrystalline structure of wires the technique allows fabrication of dense deposits with micrometer-sized single crystalline grains within AAO templates and high chemical stability towards oxidation. Nanowire arrays exhibit strong magnetization anisotropy with saturation magnetization of 180 emu/g and coercive field of 815 Oe in direction parallel to the long axis of nanowires and 230 Oe in perpendicular direction. The effective hyperfine fields on iron atoms as extracted from Mossbauer and Nuclear Forward Scattering of sample in demagnetized state indicates slight deviation of magnetization vector (~ 6°) from nanowire long axis appearing probably due to curling of magnetic moments by antisymmetric exchange interactions at the surface of nanowires.
KeywordsIron nanowires Templated electrodeposition Curling Mossbauer spectroscopy Nuclear Forward Scattering Antisymmetric exchange
This work is supported by the Russian Science Foundation (Grant No. 14-13-00809). Part of experiments was carried out using the scientific equipment purchased by M.V. Lomonosov Moscow State University Program of Development. The PETRA III light source is acknowledged for provision of synchrotron radiation beam time at the beamline P01.
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Conflict of interest
The authors declare that they have no competing interests.
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