Reversible switching of room temperature ferromagnetism in CeO2-Co nanoparticles

Details Reversible switching of room temperature ferromagnetism in CeO2-Co nanoparticles Reversible switching of room temperature ferromagnetism in CeO2-Co nanoparticles

2012-04-09

arxiv.org/abs/1204.1959v1

Physics

Condensed Matter

Materials Science

20 pages, 3 figures; Applied Physics Letters Vol. 100, Issue 17, APR2012

Scientific paper

We investigated the reversible ferromagnetic (FM) behavior of pure and Co doped CeO2 nanopowders. The as-sintered samples displayed an increasing paramagnetic contribution upon Co doping. Room temperature FM is obtained simply by performing thermal treatments in vacuum at temperatures as low as 500^{\circ}C and it can be switched off by performing thermal treatments in oxidizing conditions. The FM contribution is enhanced as we increase the time of the thermal treatment in vacuum. Those systematic experiments establish a direct relation between ferromagnetism and oxygen vacancies and open a path for developing materials with tailored properties.

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