Magnetic phase diagram of ultrathin Co/Si(111) film studied by surface magneto-optic Kerr effect

Jyh-Shen Tsay, Yeong Der Yao

Research output: Contribution to journalArticle

49 Citations (Scopus)


A magnetic phase diagram of the ultrathin Co/Si(111) film deposited at 300 K has been established by the surface magneto-optic Kerr effect technique. The temperature, where ferromagnetism vanishes, increases from 375 to 625 K as the coverage of the Co film increases from 3.5 to 16 monolayers. A quantitative calculation of the normalized Auger signal of CoSi2 shows that the calculated values lie between the experimental measured Auger signals before and after ferromagnetism vanishes for films with coverage between 3.5 and 9.1 monolayers. For samples with higher coverage, the experimental data are smaller than that by calculation. This may be qualitatively explained by Co atoms escaping from the CoSi2 phase to diffuse into the Si substrate. The disappearance of ferromagnetism is mainly attributed to suicide formation.

Original languageEnglish
Pages (from-to)1311-1313
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 1999 Mar 1


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this