Structure and magnetic properties of Fe_(1-x)Co_x nanowires in self-assembled arrays

摘要

Fe_(1-x)Co_x nanowires in self-assembled arrays with varying compositions were produced by the template-assisted pulsed electrochemical deposition method. The structural and magnetic properties of the arrays were investigated using several experimental techniques. TEM analyses indicated that the nanowires were regular, uniform, 8 μm in length and 50 nm in diameter. The results of X-ray diffraction indicated that the body-centered-cubic (bcc) (α), face-centered-cubic (fcc) (γ), and hexagonal-close-packed (hcp) (ε) Fe-Co phases appeared in different compositions. Magnetic measurements showed that the coercivity and squareness of the hysteresis loops of the Fe_(1-x)Co_x changed with their compositions, which may be attributable to shape anisotropy. The room temperature ～57Fe Mossbauer spectra of the arrays of the Fe_(1-x)Co_x nanowires revealed strong shape anisotropy.