High-temperature magnetization anomaly in Co/Ag/Si(1 1 1) ultrathin films

J. Y. Lin*, J. S. Tsay, Y. Liou, Y. D. Yao, S. F. Lee, C. S. Yang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


High-temperature magnetic properties of ultrathin Co/Ag/Si(1 1 1) films were studied by surface magneto-optic Kerr effect (SMOKE) in an ultra-high vacuum (UHV) chamber with a background pressure less than 1×10-10 Torr. A 6 mono-layer (ML) Co layer was deposited on Si(1 1 1) surface with Ag as a buffer layer with the thickness being varied between 0 and 5.6 ML. Both polar and longitudinal MOKE (P- and LMOKE) were studied as a function of temperature between 300 and 550 K. It is interesting to note that the Kerr intensity of LMOKE for Co/Ag/Si(1 1 1) thin film with Ag thickness of 2.8 and 5.6 ML decreases with increasing temperature and vanishes near 475 K; it shows up again in the opposite direction above 475 K before vanishing again at 550 K. This was not observed for samples with Ag thickness less than 2.8 ML. This indicates that the Ag buffer layer is playing an important role in the variation of magnetization of Co at high temperature; in other words, stress or small Co/Co-Ag clusters formed by the diffusion between Ag and Co layer at high temperature may cause the magnetization anomaly.

Original languageEnglish
Pages (from-to)217-219
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Issue number1-3
Publication statusPublished - 2000 Feb
Externally publishedYes
EventProceedings of the 1999 International Symposium on Advanced Magnetic Technologies (ISAMT'99) - Taipei, Taiwan
Duration: 1999 May 241999 May 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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