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

W. C. Cheng, Jyh-Shen Tsay, Y. D. Yao, K. C. Lin, C. S. Yang, S. F. Lee, T. K. Tseng, H. Y. Neih

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

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
Volume89
Issue number11 II
DOIs
Publication statusPublished - 2001 Jun 1
Event8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11

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magnetic properties
magnetization
magneto-optics
Kerr effects
Curie temperature
film thickness
cobalt
occurrences
atoms

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Cheng, W. C., Tsay, J-S., Yao, Y. D., Lin, K. C., Yang, C. S., Lee, S. F., ... Neih, H. Y. (2001). Magnetic properties of ultrathin Co/Ge(111) and Co/Ge(100) films. Journal of Applied Physics, 89(11 II), 7130-7132. https://doi.org/10.1063/1.1354584

Magnetic properties of ultrathin Co/Ge(111) and Co/Ge(100) films. / Cheng, W. C.; Tsay, Jyh-Shen; Yao, Y. D.; Lin, K. C.; Yang, C. S.; Lee, S. F.; Tseng, T. K.; Neih, H. Y.

In: Journal of Applied Physics, Vol. 89, No. 11 II, 01.06.2001, p. 7130-7132.

Research output: Contribution to journalConference article

Cheng, WC, Tsay, J-S, Yao, YD, Lin, KC, Yang, CS, Lee, SF, Tseng, TK & Neih, HY 2001, 'Magnetic properties of ultrathin Co/Ge(111) and Co/Ge(100) films', Journal of Applied Physics, vol. 89, no. 11 II, pp. 7130-7132. https://doi.org/10.1063/1.1354584
Cheng, W. C. ; Tsay, Jyh-Shen ; Yao, Y. D. ; Lin, K. C. ; Yang, C. S. ; Lee, S. F. ; Tseng, T. K. ; Neih, H. Y. / Magnetic properties of ultrathin Co/Ge(111) and Co/Ge(100) films. In: Journal of Applied Physics. 2001 ; Vol. 89, No. 11 II. pp. 7130-7132.
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AU - Yang, C. S.

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AB - 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).

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