Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4220
Title: Temperature dependence of magnetoresistivity of cobalt-polytetrafluoroethylene granular composite films
Authors: Kwong, Ho-yin Anthony
Wong, Yuen-wah
Wong, Kin-hung
Subjects: Cobalt
Enhanced magnetoresistance
Ferromagnetic materials
Filled polymers
Granular materials
Magnetic moments
Magnetic relaxation
Pulsed laser deposition
Thin films
Tunnelling
Issue Date: 1-Dec-2007
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 Dec. 2007, v. 102, no. 11, 114303, p. 1-4.
Abstract: Heterogeneous granular films consisting of ferromagnetic cobalt particles embedded in a polytetrafluoroethylene polymer matrix were fabricated by the pulsed laser deposition technique carried out with a Nd-doped yttrium aluminum garnet laser at 355 nm. The samples exhibit a magnetoresistance (MR) change of 4% (at 8 kOe) at room temperature. An enhancement of MR to a value of 6% was observed at 20 K which is attributed to the increasing order of magnetic moments in the ferromagnetic state at low temperature. Significant loop opening of the MR profile at low temperature and the temperature dependence of MR reveal the interplay of superparamagnetic relaxation behavior and spin-dependent electron tunneling.
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in H. Y. Kwong, Y. W. Wong & K. H. Wong, J. Appl. Phys. 102, 114303 (2007) and may be found at http://link.aip.org/link/?jap/102/114303.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/4220
DOI: 10.1063/1.2821240
ISSN: 0021-8979 (print)
1089-7550 (online)
Appears in Collections:AP Journal/Magazine Articles

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