Reactive sputtering synthesis of Co-CoO/Ag nanogranular and multilayer films containing core-shell particles
- Departamento de Fisica Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real (Spain)
We present magnetic characterization of two series of samples grown by reactive sputtering of Co and Ag: (i) thin films obtained by cosputtering of these metals at different oxygen pressures, and (ii) Co/Ag multilayer films deposited with fixed Co layer thickness (1.1 nm) and oxygen pressure (2x10{sup -5} mbar), and varying Ag layer thickness t{sub Ag}. For certain preparation conditions the samples obtained with both synthesis methods consist of a dispersion of core-shell Co-CoO nanoparticles embedded in a Ag matrix. Regarding series (i), it is remarkable that the interesting core-shell/matrix structure, suggested by exchange-bias and giant magnetoresistance properties, could be achieved using the simple one-step technique of reactive cosputtering. In series (ii), the exchange-bias and coercivity fields strongly depend on the spacer layer thickness for t{sub Ag}<4 nm, and then become roughly thickness independent. A discontinuous-continuous transition in the silver layers with increasing t{sub Ag}, similar to that observed in a previous study, is hypothesized as the origin of the behavior in both fields.
- OSTI ID:
- 20982859
- Journal Information:
- Journal of Applied Physics, Vol. 101, Issue 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2671688; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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