Magnetoresistance of Fe–Ta–O films prepared by RF plasma jet method

The structure, magnetic and electric properties of Fe–Ta–O films prepared by the RF plasma jet technique were investigated. With increasing content of O the conductance changes from metallic to tunnelling one. In some films with the Fe/Ta ratio close to 0.25 the superparamagnetic properties and spin...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2001-05, Vol.226, p.669-670
Main Authors: Kraus, L, Chayka, O, Touš, J, Fendrych, F, Pirota, K.R, Šı́cha, M, Jastrabı́k, L
Format: Article
Language:English
Subjects:
Magnetoresistance
Nanogranular alloy
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Summary:The structure, magnetic and electric properties of Fe–Ta–O films prepared by the RF plasma jet technique were investigated. With increasing content of O the conductance changes from metallic to tunnelling one. In some films with the Fe/Ta ratio close to 0.25 the superparamagnetic properties and spin-dependent tunnelling magnetoresistance (with Δ ρ/ ρ up to 1.5% at 77.3 K) were observed. The behavior can be explained by the nanogranular structure consisting of ferromagnetic metallic grains embedded in an insulating amorphous matrix.
ISSN:0304-8853
DOI:10.1016/S0304-8853(00)01047-7