Angular dependence of coercivity and remanence of Ni nanowire arrays and its relevance to magnetoviscosity

Autor:	Annegret Günther, R. Birringer, Andreas Tschöpe, Andreas Michels, S. Monz
Rok vydání:	2008
Předmět:	Ferrofluid Materials science Condensed matter physics Magnetometer Nanowire chemistry.chemical_element Coercivity Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetic field Nickel Magnetization chemistry law Remanence
Zdroj:	Journal of Magnetism and Magnetic Materials. 320:1340-1344
ISSN:	0304-8853
DOI:	10.1016/j.jmmm.2007.11.019
Popis:	Ni nanowire arrays with varying wire dimensions (diameter d , length l ) and center-to-center distances d CC 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 H C ( θ ) and reduced remanence m R /m S ( θ ) exhibit a strong dependence on the wire dimensions and the center-to-center distance. For instance, for nanowire arrays with d =40 nm, d CC =100 nm, and for θ =0°, the coercivity takes on a rather large value of μ 0 H C =85 mT and m R /m S ≅94%; reducing d CC to 30 nm and d to 17 nm results in μ 0 H C =49 mT and m R /m S ≅57%, an observation which suggests an increasing magnetostatic interwire interaction at increased ( d / d CC )-ratio. The potential application of nanowires as the constituents of ferrofluids is discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8871158bdef5d4f2b7ec69514f09faa5 https://doi.org/10.1016/j.jmmm.2007.11.019 Zobrazit plný text záznamu Full Text from ScienceDirect