Probing the Quality of Ni Filled Nanoporous Alumina Templates by Magnetic Techniques

• Type: Article in International Scientific Journal
• Date: 2012

Authors

sousa, c. t. (Author) Other; leitao, d. c. (Author) Other; proenca, m. p. (Author) Other; apolinario, a. (Author) Other; azevedo, a. m. (Author) Other; sobolev, n. a. (Author) Other; bunyaev, s. a. (Author) Other; pogorelov, yu. g. (Author) Other; ventura, j. (Author) FCUP; araujo, j. p. (Author) FCUP; kakazei, g. n. (Author) Other

Journal

Title: Journal of Nanoscience and Nanotechnology

Vol. 12

Pages: 7486-7490

ISSN: 1533-4880

Publisher: American Scientific Publishers

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 13 Citations

Other information

Authenticus ID: P-002-622

DOI: 10.1166/jnn.2012.6535

Abstract (EN): Pulsed electrodeposition prepared porous alumina templates with Ni nanowires pore filling ranged from 1 to 100%, depending on the alumina barrier-layer thickness, were probed by continuous wave ferromagnetic resonance at room temperature. For completely filled samples, a single resonance peak was observed in the whole range of angles between the applied magnetic field and normal to the sample plane. Its position was described by Kittel formula that takes into account shape anisotropy of individual Ni wires and dipolar interactions between them. For the samples with lower pore filling the effective anisotropy field decreased and the resonance linewidth in the perpendicular configuration increased. Also a quite intense second peak was observed at lower fields for these samples. These changes are associated with reduction of pore filling percentage that can lead to decrease of dipolar interactions between nanowires and to appearance of magnetic inhomogeneities inside wires.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5