Article (Scientific journals)
Angular dependence of coercivity and remanence of Ni nanowire arrays and its relevance to magnetoviscosity
Günther, Annegret; Monz, S.; Tschöpe, A. et al.
2008In Journal of Magnetism and Magnetic Materials, 320 (7), p. 1340-1344
Peer reviewed
 

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Keywords :
Nanowires; Magnetization reversal; Coercivity; Magnetoviscous effect
Abstract :
[en] Ni nanowire arrays with varying wire dimensions (diameter d, length l) and center-to-center distances dCC were synthesized by pulsed electrodeposition of Ni in porous Al templates. The magnetization-reversal behavior of the arrays was investigated by means of magnetometry for different angles θ between the wire axes and the applied magnetic field. The functional dependences of the characteristic parameters coercivity HC(θ) and reduced remanence mR/mS(θ) exhibit a strong dependence on the wire dimensions and the center-to-center distance. For instance, for nanowire arrays with d=40 nm, dCC=100 nm, and for θ=0°, the coercivity takes on a rather large value of μ0HC=85 mT and mR/mS=94%; reducing dCC to 30 nm and d to 17 nm results in μ0HC=49 mT and mR/mS=57%, an observation which suggests an increasing magnetostatic interwire interaction at increased (d/dCC)-ratio. The potential application of nanowires as the constituents of ferrofluids is discussed.
Disciplines :
Physics
Identifiers :
UNILU:UL-ARTICLE-2010-478
Author, co-author :
Günther, Annegret ;  Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Monz, S.;  Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Tschöpe, A.;  Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Birringer, R.;  Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Michels, Andreas  ;  Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Language :
English
Title :
Angular dependence of coercivity and remanence of Ni nanowire arrays and its relevance to magnetoviscosity
Publication date :
2008
Journal title :
Journal of Magnetism and Magnetic Materials
ISSN :
0304-8853
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
320
Issue :
7
Pages :
1340-1344
Peer reviewed :
Peer reviewed
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