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Title: Magnetoresistivity of cobalt-polytetrafluoroethylene granular composites
Authors: Kwong, Ho-yin Anthony
Wong, Man-hon
Wong, Yuen-wah
Wong, Kin-hung
Subjects: Filled polymers
Granular materials
Giant magnetoresistance
Magnetic thin films
Pulsed laser deposition
Infrared spectra
Ferromagnetic materials
Issue Date: 23-Oct-2006
Publisher: American Institute of Physics
Source: Applied physics letters, 23 Oct. 2006, v. 89, no. 17, 173109, p. 1-3.
Abstract: Giant magnetoresistance (GMR) was observed in a heterogeneous granular film with polymer matrix. Cobalt and polytetrafluoroethylene (PTFE) were deposited on glass substrates by using the pulsed laser deposition technique. IR absorption spectra of the deposited PTFE showed similar characteristics with the bulk PTFE. The granular samples exhibit a resistance change of about 5% (at 10 kOe) at room temperature. The temperature dependence of resistance of the samples shows that charge transportation is mainly due to tunneling between the metal particles. The GMR can thus be interpreted by the spin-dependent electrons tunneling through the ferromagnetic metal granules (cobalt) in the insulating matrix (PTFE).
Rights: © 2006 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 et al., Appl. Phys. Lett. 89, 173109 (2006) and may be found at
Type: Journal/Magazine Article
DOI: 10.1063/1.2364270
ISSN: 0003-6951 (print)
1077-3118 (online)
Appears in Collections:AP Journal/Magazine Articles

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