Magnetic phases of Co/Ge(1 1 1) studied using surface magneto-optic Kerr effect

J. S. Tsay*, H. Y. Nieh, Y. D. Yao, Y. T. Chen, W. C. Cheng


研究成果: 雜誌貢獻會議論文同行評審

13 引文 斯高帕斯(Scopus)


Co/Ge(111) films are nonferromagnetic up to 9.5 monolayers as deposited at 300 K. Upon cryogenic treatments, magnetic phases are experimentally resolved for Co/Ge(111) films thinner than 12 monolayers using the surface magneto-optic Kerr effect technique. Systematic investigations of the magnetic properties for Co/Ge(111) films revealed a transition of nonferromagnetism to ferromagnetism at low temperatures. The transition temperature increases from below 125 K to above 300 K as the cobalt coverage increases from 6.3 to 12 monolayers. The critical exponent β in the power law relationship of magnetization is about 0.23 that is close to the value expected by a two-dimensional XY model. Auger electron spectroscopy measurements suggest the co-existence of a pure cobalt and a Co-Ge compound layers in the nonferromagnetic Co/Ge(111) films.

頁(從 - 到)226-230
期刊Surface Science
發行號1-3 PART 1
出版狀態已發佈 - 2004 9月 20
事件Proceedings of the 22nd European Conference on Surface Science - Prague, 捷克共和国
持續時間: 2003 9月 72003 9月 12

ASJC Scopus subject areas

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學


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