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Title: Magnetic behavior of NiCu nanowire arrays: Compositional, geometry and temperature dependence

Arrays of Ni{sub 100−x}Cu{sub x} nanowires ranging in composition 0 ≤ x ≤ 75, diameter from 35 to 80 nm, and length from 150 nm to 28 μm have been fabricated by electrochemical co-deposition of Ni and Cu into self-ordered anodic aluminum oxide membranes. As determined by X-ray diffraction and Transmission Electron Microscopy, the crystalline structure shows fcc cubic symmetry with [111] preferred texture and preferential Ni or Cu lattice depending on the composition. Their magnetic properties such as coercivity and squareness have been determined as a function of composition and geometry in a Vibrating Sample Magnetometer in the temperature range from 10 to 290 K for applied magnetic fields parallel and perpendicular to the nanowires axis. Addition of Cu into the NiCu alloy up to 50% enhances both parallel coercivity and squareness. For the higher Cu content, these properties decrease and the magnetization easy axis becomes oriented perpendicular to the wires. In addition, coercivity and squareness increase by decreasing the diameter of nanowires which is ascribed to the increase of shape anisotropy. The temperature dependent measurements reflect a complex behavior of the magnetic anisotropy as a result of energy contributions with different evolution with temperature.
Authors:
; ; ;  [1] ;  [2]
  1. Institute of Materials Science of Madrid, CSIC, Madrid 28049 (Spain)
  2. Advanced Microscopy Laboratory (LMA), Institute of Nanoscience of Aragón (INA)-ARAID and Department of Condensed Matter Physics, University of Zaragoza, Zaragoza 50018 (Spain)
Publication Date:
OSTI Identifier:
22308480
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ALLOYS; ALUMINIUM OXIDES; ANISOTROPY; COERCIVE FORCE; COPPER COMPOUNDS; DEPOSITION; ELECTROCHEMISTRY; FCC LATTICES; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIZATION; NANOWIRES; NICKEL COMPOUNDS; QUANTUM WIRES; SYMMETRY; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; VIBRATING SAMPLE MAGNETOMETERS; X-RAY DIFFRACTION