Magnetic properties of ultrathin Co/Ge(111) and Co/Ge(100) films

W. C. Cheng*, J. S. Tsay, Y. D. Yao, K. C. Lin, C. S. Yang, S. F. Lee, T. K. Tseng, H. Y. Neih

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


The orientation of the magnetization and the occurrence of interfacial ferromagnetic inactive layers for ultrathin Co films grown on Ge(111) and Ge(100) surfaces have been studied using the in situ surface magneto-optic Kerr effect. On a Ge(111) substrate, cobalt films (≤28 monolayers) with in-plane easy axis of magnetization have been observed; however, on a Ge(100) substrate, ultrathin Co films (14-16 monolayers) with canted out-of-plane easy axis of magnetization were measured. The ferromagnetic inactive layers were formed due to the intermixing of Co and Ge and lowering the Curie temperature by reducing Co film thickness. The Co-Ge compound inactive layers were 3.8 monolayers thick for Co films grown on Ge(111) and 6.2 monolayers thick for Co films deposited on Ge(100). This is attributed to the difference of the density of surface atoms on Ge(111) and Ge(100).

Original languageEnglish
Pages (from-to)7130-7132
Number of pages3
JournalJournal of Applied Physics
Issue number11 II
Publication statusPublished - 2001 Jun 1
Externally publishedYes
Event8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11

ASJC Scopus subject areas

  • General Physics and Astronomy


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