GaAs–Fe<sub>3</sub>Si Core–Shell Nanowires:
Nanobar Magnets
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Abstract
Semiconductor–ferromagnet
GaAs–Fe<sub>3</sub>Si core–shell
nanowires were grown by molecular beam epitaxy and analyzed by scanning
and transmission electron microscopy, X-ray diffraction, Mössbauer
spectroscopy, and magnetic force microscopy. We obtained closed and
smooth Fe<sub>3</sub>Si shells with a crystalline structure that show
ferromagnetic properties with magnetizations along the nanowire axis
(perpendicular to the substrate). Such nanobar magnets are promising
candidates to enable the fabrication of new forward-looking devices
in the field of spintronics and magnetic recording