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Issue 29, 2017
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High magnetoresistance at low magnetic fields in self-assembled ZnO–Co nanocomposite films

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Abstract

The solid phase growth of self-assembled nanocrystals embedded in a crystalline host matrix opens up wide perspectives for the coupling of different physical properties, such as magnetic and semiconducting. In this work, we report the pulsed laser growth at room temperature of thin films composed of a dispersed array of ferromagnetic Co (0001) nanoclusters with an in-plane mono-size width of 1.3 nm, embedded in a ZnO (0001) crystalline matrix. The as-grown films lead to very high values of magnetoresistance, ranging at 9 T from −11% at 300 K to −19% at 50 K, with a steep decrease of the magnetoresistance at low magnetic fields. We establish the relationship between the magnetoresistance behavior and the magnetic response of the Co nanocluster assembly. A spin-dependent tunneling of the electrons between the Co nanoclusters through and by the semi-insulating ZnO host is achieved in our films, promising with regard to magnetic field sensors or Si-integrated spintronic devices. The effects of thermal annealing are also discussed.

Graphical abstract: High magnetoresistance at low magnetic fields in self-assembled ZnO–Co nanocomposite films

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Publication details

The article was received on 29 Mar 2017, accepted on 17 Jun 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR02236K
Citation: Nanoscale, 2017,9, 10431-10439
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    High magnetoresistance at low magnetic fields in self-assembled ZnO–Co nanocomposite films

    N. Jedrecy, M. Hamieh, C. Hebert and J. Perriere, Nanoscale, 2017, 9, 10431
    DOI: 10.1039/C7NR02236K

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