High field magnetoresistance in Co–Al–O nanogranular films

We have studied magnetic and electrical transport properties of Co–Al–O nanogranular films. The films prepared by laser ablation consist of Co particles embedded in an insulating Al 2O 3 matrix. Different current–voltage characteristics are observed depending on Co concentration in the films. Tunnel...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2006-05, Vol.300 (2), p.293-299
Main Authors: Chayka, O., Kraus, L., Lobotka, P., Sechovsky, V., Kocourek, T., Jelinek, M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Electronic transport in condensed matter
Exact sciences and technology
Granular system
Magnetic properties and materials
Physics
Spin polarized transport
Superparamagnetism
Tunneling magnetoresistance
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Summary:We have studied magnetic and electrical transport properties of Co–Al–O nanogranular films. The films prepared by laser ablation consist of Co particles embedded in an insulating Al 2O 3 matrix. Different current–voltage characteristics are observed depending on Co concentration in the films. Tunneling magnetoresistance (TMR) shows an anomalous behavior in high magnetic fields at low temperatures. The presence of magnetic atoms dispersed in the insulator is a possible explanation of the observed anomaly of the TMR.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2005.05.015