Reversible strain effect on the magnetization of LaCoO3 films (2008)
Herklotz, A., Rata, A. D., Schultz, L., Doerr, K.
The magnetization of ferromagnetic LaCoO3 films grown epitaxially on piezoelectric substrates has been found to systematically decrease with the reduction of tensile strain. The magnetization change...
Strain-induced insulator state in La_0.7Sr_0.3CoO_3 (2007)
Rata, A. D., Herklotz, A., Nenkov, K., Schultz, L., Doerr, K.
We report on the observation of a strain-induced insulator state in ferromagnetic La_0.7Sr_0.3CoO_3 films. Tensile strain above 1% is found to enhance the resistivity by several orders of magnitude....
Rata, A. D., Braak, H., Buergler, D. E., Schneider, C. M.
Magnetic tunnel junctions with the layer sequence Co$_2$Cr$_{0.6}$Fe$_{0.4}$Al/MgO/CoFe were fabricated by magnetron sputtering at room temperature (RT). The samples exhibit a large inverse tunneling...
Structural and magneto-transport characterization of Co_2Cr_xFe_(1-x)Al Heusler alloy films (2006)
Rata, A. D., Braak, H., Buergler, D. E., Cramm, S., Schneider, C. M.
We investigate the structure and magneto-transport properties of thin films of the Co_2Cr_xFe_(1-x)Al full-Heusler compound, which is predicted to be a half-metal by first-principles theoretical...
Rzhevsky, A. A., Krichevtsov, B. B., Rata, A.D., Chang, C.F., Sutarto, R., Tjeng, L. H., ...
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Giant positive magnetoresistance in metallic VOx thin films (2003)
Rata, A. D., Kataev, V., Khomskii, D., Hibma, T.
We report on giant positive magnetoresistance effect observed in VOx thin films, epitaxially grown on SrTiO3 substrate. The MR effect depends strongly on temperature and oxygen content and is...
Growth and properties of strained VOx thin films with controlled stoichiometry (2003)
Rata, A. D., Chezan, A. R., Hibma, T., Haverkort, M. W., Tjeng, L. H., Hsieh, H. H., ...
We have succeeded in growing epitaxial films of rocksalt VOx on MgO(001) substrates. The oxygen content as a function of oxygen flux was determined using 18O2-RBS and the vanadium valence using XAS....