Towards Magnetic Bimetallic Wire-Like Nanostructures — Magnetic Field as Growth Parameter
M. Krajewskia, M. Tokarczykb, A. Witeckaa, S. Lewińskac, A. Ślawska-Waniewskac, M. Płocińskad
aInstitute of Fundamental Technological Research, Polish Academy of Sciences, A. Pawińskiego 5B, 02-106 Warsaw, Poland
bUniversity of Warsaw, Faculty of Physics, L. Pasteura 5, 02-093 Warsaw, Poland
cInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
dWarsaw University of Technology, Faculty of Materials Science and Engineering, Wołoska 141, 02-507 Warsaw, Poland
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The magnetically-assisted growth of the amorphous bimetallic iron-nickel wire-like nanostructures is presented in this work. The applied process is based on a simple reduction reaction of aqueous solutions containing Fe2+ and Ni2+ ions with NaBH4 in the presence of an external magnetic field of about 0.05 T. The morphology, chemical composition, and magnetic properties of as-prepared Fe-Ni nanostructures have been determined by means of scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffractometry, and vibrating sample magnetometry. The obtained experimental data indicate that the as-prepared samples exhibit quite complex architectures i.e., they comprise of nanoparticles aligned in almost straight lines. In addition, they reveal the typical core-shell structures where the amorphous bimetallic alloy cores are covered by thin amorphous oxide shells. In turn, the magnetic measurements show that the Fe-Ni wire-like nanostructures behave as typical ferromagnetic nanomaterials and their magnetic parameters like saturation magnetizations and coercivities are strictly dependent on their sizes and chemical compositions.

topics: amorphous materials, bimetallic nanostructures, magnetic-field-induced synthesis, magnetic \\m{materials}, wire-like nanostructures