Title: Complex magnetic interactions and charge transfer effects in highly ordered NixFe1-x nano-wires
Authors: Chang, Shu-Jui
Yang, Chao-Yao
Ma, Hao-Chung
Tseng, Yuan-Chieh
Department of Materials Science and Engineering
Keywords: NiFe;Nano-wires;XMCD;Charge transfer
Issue Date: 1-Apr-2013
Abstract: This work investigates the subtle magnetic interactions within the NixFe1-x (x=0.3, 0.5, and 1.0) nano-wires by probing spin-dependent behaviors of the two constituted elements. The wires were fabricated by electro-deposition and an anode aluminum oxide template to produce free-standing nature, and the Ni-Fe interactions were probed by x-ray magnetic spectroscopy across a BCC -> FCC structural transition. The wires' magneto-structural properties were predominated by Ni, as reflected by a decrease but an increase in total magnetization and FCC x-ray intensity with increasing x, even if the Fe moment increased simultaneously. Upon annealing, a prominent charge transfer, together with the changes of spin-dependent states, took place in the Ni and Fe 3d orbitals, and a structural disordering was also obtained, for the wires at x=0.3. The charge transfer led to a local magnetic-compensation for the two elements, explaining the minor change in total magnetization for x=0.3 probed by a vibrational sample magnetometer. When x was increased to 0.5, however, the charge transfer became inactive due to persistent structural stability supported by Ni, albeit resulting in nearly invariant magnetization similar to that of x=0.3. The complexity of the Ni-Fe interactions varied with the composition and involved the modifications of the coupled magnetic, electronic and structural degrees of freedom. The study identifies the roles of Ni and Fe as unequally-influential in NixFe1-x, which provides opportunities to re-investigate the compound's properties concerning its technological applications. (C) 2012 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jmmm.2012.11.037
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2012.11.037
Volume: 332
Begin Page: 21
End Page: 27
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