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American Institute of Physics, Journal of Applied Physics, 5(108), p. 053713

DOI: 10.1063/1.3475993

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Substrate-induced strain and its effect in CrO2 thin films

Journal article published in 2010 by M. Pathak, H. Sato, X. Zhang, K. B. Chetry, D. Mazumdar, P. Leclair ORCID, A. Gupta
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We report a study of substrate-induced strain and its effect in (100) and (110) CrO2 thin films deposited on TiO2 substrates of respective orientations. While the (110) CrO2 films grow essentially strain-free, the (100) CrO2 films were found to be strained in all lattice directions—out of plane direction was compressively strained while in-plane directions were under tensile strain. Crystal lattice parameters were determined in strained (100) and strain-free (110) CrO2 films together with the amount of strain in the three lattice directions. We found substrate-induced strain to significantly affect the magnetic moment in the (100) CrO2 films at room temperature—reducing the magnetic moment with increasing strain in the (100) films while strain-free (110) CrO2 thin films have higher moments for all thicknesses. Qualitative macroscopic conductance behavior in the strained (100) and strain-free (110) CrO2 films were found to be comparable for temperatures in the range of 5–400 K, showing similar behavior at low temperature as well as near Tc.