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

doi:10.1016/j.susc.2004.06.123

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

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

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 language	English
Pages (from-to)	226-230
Number of pages	5
Journal	Surface Science
Volume	566-568
Issue number	1-3 PART 1
DOIs	https://doi.org/10.1016/j.susc.2004.06.123
Publication status	Published - 2004 Sept 20
Externally published	Yes
Event	Proceedings of the 22nd European Conference on Surface Science - Prague, Czech Republic Duration: 2003 Sept 7 → 2003 Sept 12

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

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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

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.",

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

author = "Tsay, \{J. S.\} and Nieh, \{H. Y.\} and Yao, \{Y. D.\} and Chen, \{Y. T.\} and Cheng, \{W. C.\}",

note = "Funding Information: One of the authors (J.S. Tsay) acknowledges support from the National Science Council of ROC under Grant no. NSC 91-2112-M-029-010.; Proceedings of the 22nd European Conference on Surface Science ; Conference date: 07-09-2003 Through 12-09-2003",

year = "2004",

month = sep,

day = "20",

doi = "10.1016/j.susc.2004.06.123",

language = "English",

volume = "566-568",

pages = "226--230",

journal = "Surface Science",

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number = "1-3 PART 1",

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T1 - Magnetic phases of Co/Ge(1 1 1) studied using surface magneto-optic Kerr effect

AU - Tsay, J. S.

AU - Nieh, H. Y.

AU - Yao, Y. D.

AU - Chen, Y. T.

AU - Cheng, W. C.

N1 - Funding Information: One of the authors (J.S. Tsay) acknowledges support from the National Science Council of ROC under Grant no. NSC 91-2112-M-029-010.

PY - 2004/9/20

Y1 - 2004/9/20

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.

KW - Auger electron spectroscopy

KW - Cobalt

KW - Germanium

KW - Magnetic films

KW - Magnetic measurements

KW - Magnetic phenomena (cyclotron resonance, phase transitions, etc.)

KW - Metal-semiconductor magnetic thin film structure

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UR - https://www.scopus.com/pages/publications/4544251448#tab=citedBy

U2 - 10.1016/j.susc.2004.06.123

DO - 10.1016/j.susc.2004.06.123

M3 - Conference article

AN - SCOPUS:4544251448

SN - 0039-6028

VL - 566-568

SP - 226

EP - 230

JO - Surface Science

JF - Surface Science

IS - 1-3 PART 1

T2 - Proceedings of the 22nd European Conference on Surface Science

Y2 - 7 September 2003 through 12 September 2003

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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