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

Jyh-Shen Tsay, H. Y. Nieh, Y. D. Yao, Y. T. Chen, W. C. Cheng

Research output: Contribution to journalConference article

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)226-230
Number of pages5
JournalSurface Science
Volume566-568
Issue number1-3 PART 1
DOIs
Publication statusPublished - 2004 Sep 20
EventProceedings of the 22nd European Conference on Surface Science - Prague, Czech Republic
Duration: 2003 Sep 72003 Sep 12

Fingerprint

Magnetooptical effects
magneto-optics
Kerr effects
Monolayers
Cobalt
cobalt
Ferromagnetism
Auger electron spectroscopy
two dimensional models
Cryogenics
ferromagnetism
Superconducting transition temperature
Auger spectroscopy
cryogenics
electron spectroscopy
Magnetization
Magnetic properties
transition temperature
exponents
magnetic properties

Keywords

  • Auger electron spectroscopy
  • Cobalt
  • Germanium
  • Magnetic films
  • Magnetic measurements
  • Magnetic phenomena (cyclotron resonance, phase transitions, etc.)
  • Metal-semiconductor magnetic thin film structure

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Magnetic phases of Co/Ge(1 1 1) studied using surface magneto-optic Kerr effect. / Tsay, Jyh-Shen; Nieh, H. Y.; Yao, Y. D.; Chen, Y. T.; Cheng, W. C.

In: Surface Science, Vol. 566-568, No. 1-3 PART 1, 20.09.2004, p. 226-230.

Research output: Contribution to journalConference article

Tsay, J-S, Nieh, HY, Yao, YD, Chen, YT & Cheng, WC 2004, 'Magnetic phases of Co/Ge(1 1 1) studied using surface magneto-optic Kerr effect', Surface Science, vol. 566-568, no. 1-3 PART 1, pp. 226-230. https://doi.org/10.1016/j.susc.2004.06.123
Tsay, Jyh-Shen ; Nieh, H. Y. ; Yao, Y. D. ; Chen, Y. T. ; Cheng, W. C. / Magnetic phases of Co/Ge(1 1 1) studied using surface magneto-optic Kerr effect. In: Surface Science. 2004 ; Vol. 566-568, No. 1-3 PART 1. pp. 226-230.
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AU - Tsay, Jyh-Shen

AU - Nieh, H. Y.

AU - Yao, Y. D.

AU - Chen, Y. T.

AU - Cheng, W. C.

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N2 - 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.

AB - 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.

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KW - Germanium

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KW - Magnetic measurements

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