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http://hdl.handle.net/10397/4220
Title: | Temperature dependence of magnetoresistivity of cobalt-polytetrafluoroethylene granular composite films | Authors: | Kwong, HYA Wong, YW Wong, KH |
Issue Date: | 1-Dec-2007 | 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. | Keywords: | Cobalt Enhanced magnetoresistance Ferromagnetic materials Filled polymers Granular materials Magnetic moments Magnetic relaxation Pulsed laser deposition Thin films Tunnelling |
Publisher: | American Institute of Physics | Journal: | Journal of applied physics | ISSN: | 0021-8979 | EISSN: | 1089-7550 | DOI: | 10.1063/1.2821240 | 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. |
Appears in Collections: | Journal/Magazine Article |
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