Structural characteristics and magnetic properties of λ-MnO2 films grown by plasma-assisted molecular beam epitaxy

L. W. Guo, D. L. Peng, H. Makino, Takashi Hanada, S. K. Hong, K. Sumiyama, T. Yao, K. Inaba

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Abstract

High-quality λ-MnO2 single-crystal films were fabricated on MgO (001) substrates by plasma-assisted molecular beam epitaxy. The structural characteristics and magnetic properties of the films were studied. Two magnetic transition temperatures, T1 and T2, were observed from the films. Their magnetic behavior differed from that of bulk polycrystalline samples synthesized by removing Li ions from the parent LiMn2O4. The first, T1, setting at around 20 K, corresponded to long-range antiferromagnetic ordering similar to that observed in bulk at 32 K. T2, set at 43 K, corresponded to weak long-range ferromagnetic ordering among net magnetization of clusters, in which short-range antiferromagnetic ordering existed. T1 shifted to lower temperature with decreasing film thickness, which indicated that the proximity of the interface and strain played a key role in determining the transition temperature.

Original languageEnglish
Pages (from-to)351-354
Number of pages4
JournalJournal of Applied Physics
Volume90
Issue number1
DOIs
Publication statusPublished - 2001 Jul 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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