Grain-Boundary Magnetoresistance of CrO2 Films Grown on TiO 2-Buffered LaAlO3 Substrates

S. J. Liu, J. Y. Juang, K. H. Wu, T. M. Uen, Y. S. Gou, J. Y. Lin

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The magnetic and magnetotransport properties of predominantly (110)-oriented CrO2 films grown on TiO2-buffered LaAlO3 substrates were investigated. The atomic force microscopic images revealed that the as-grown CrO2 films are granular. The magnetic measurements indicated that in-plane coercive fields are about 60 Oe and 100 Oe at 300 K and 7 K, respectively. The as-grown films are semiconductive below 75 K; a magnetoresistance with a ΔR/R0 ratio of -13 % in a magnetic field of 5 T was observed at 5 K, which is absent in high-quality epitaxial films. The coincidence between the coercive field and the peaks of the magnetoresistive loop measured at low temperatures indicates that spin-dependent scattering plays a crucial role in the transport properties.

Original languageEnglish
Pages (from-to)406-413
Number of pages8
JournalChinese Journal of Physics
Volume41
Issue number4
Publication statusPublished - 2003 Aug

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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