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Ferromagnetic properties of Co-doped CeO2

Boris Vodungbo 1,2Yunlin Zheng 1Dominique Demaille 1Franck Vidal 1,2Victor H. Etgens 1Dante H. Mosca 3

1. Institut des nanosciences de Paris (INSP), 140 rue de Lourmel, Paris 75015, France
2. Universite Pierre et Marie Curie, Place Jussieu, Bat F Boite 39, Paris 75252, France
3. Universidade Federal de Parana (UFPR), Campus Universitario, Curitiba 00000-000, Brazil

Abstract

Crystalline Ce1-xCoxO2 epilayers have been grown by pulsed laser deposition on SrTiO3(001) substrates. It turns out that the epilayers are ferromagnetic at room temperature with the magnitude of the magnetic moment depending on the growth parameters. Films grown under vacuum (P=10-6 mbar) exhibit higher magnetic moment than films grown under oxygen pressure (P=5.10-2 mbar). Moreover, when films grown under vacuum are subsequently annealed in an oxygen atmosphere, their magnetic moments is strongly reduced. This behaviour strongly suggests that the ferromagnetism is mediated by defects. Epilayers have been studied using x-ray diffraction (XRD) and high-resolution transmission microscopy (HRTEM). All the films are (001) oriented and display a 45 ° in-plane rotation from SrTiO3. HRTEM micrographs has shown a very good crystal quality with no visible inclusions such as Co precipitates. Preliminary electrical measurements show that the films are highly resistive. All these results points CeO2 as a promising material for applications in spintronics.

 

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium E, by Boris Vodungbo
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-14 23:58
Revised:   2009-06-07 00:44