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Structural and magnetic properties of epitaxial CrO2 thin films grown on TiO2 (001) substrates

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5 Author(s)
Zhang, Xueyu ; MINT Center, University of Alabama, Tuscaloosa, Alabama 35487, USA ; Zhong, Xing ; Visscher, P.B. ; LeClair, Patrick R.
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The structural and magnetic properties of epitaxial CrO2 thin films grown on (001)-oriented TiO2 substrates by atmospheric pressure chemical vapor deposition are investigated. Due to the competition between demagnetization and a relatively weak perpendicular magnetocrystalline anisotropy, the deposited CrO2 (001) films exhibit magnetic properties that are significantly different from CrO2 (100) and CrO2 (110) films grown on TiO2 substrates. Based on the thickness dependence of M-H curves, a surface anisotropy is confirmed to exist, likely originating from strain in the film. The out-of-plane hysteresis curves can be well described by a distribution of effective anisotropy that may be due to a varying local demagnetizing field and a distribution of strain across the film. For the in-plane magnetization, the hysteresis curves are consistent with stripe or vortex domain structures of an almost closed flux configuration at remanence.

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Applied Physics Letters  (Volume:102 ,  Issue: 16 )