Coercivity enhancement of ultrathin Co/Ge(1 1 1) films by Co/O interfacial anisotropy

H. W. Chang; J. S. Tsay; Y. L. Chiou; K. T. Huang; W. Y. Chan; Y. D. Yao

doi:10.1016/j.jmmm.2006.11.114

Coercivity enhancement of ultrathin Co/Ge(1 1 1) films by Co/O interfacial anisotropy

H. W. Chang, J. S. Tsay^*, Y. L. Chiou, K. T. Huang, W. Y. Chan, Y. D. Yao

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Magnetic properties of oxygen exposed on the ultrathin Co/Ge(1 1 1) films have been investigated by surface magneto-optic Kerr effect (SMOKE). After being exposed on the 15-30 monolayers (ML) Co/Ge(1 1 1) films, the oxygen atoms only distribute on the topmost layer of Co films. The oxygen layer influences the electronic density of states of Co only on the topmost layer and leads to reduction in the saturated magnetization. Besides, the appearance of the Co/O interface forms additional interfacial anisotropy; consequently, coercivity of ultrathin Co/Ge(1 1 1) film is enhanced. As an example for 15 ML Co/Ge(1 1 1), the coercivity increases from 730 to 920 Oe with 200 L of oxygen exposure. Besides, the film with thinner Co layer exhibits stronger coercivity enhancement effect after exposing 200 L oxygen.

Original language	English
Pages (from-to)	e741-e742
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.11.114
Publication status	Published - 2007 Mar

Keywords

Co/O interface
Coercivity
Surface magneto-optic Kerr effect
Ultrathin magnetic film

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2006.11.114

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@article{c39a0d6308ce4abe898c166e9eeec666,

title = "Coercivity enhancement of ultrathin Co/Ge(1 1 1) films by Co/O interfacial anisotropy",

abstract = "Magnetic properties of oxygen exposed on the ultrathin Co/Ge(1 1 1) films have been investigated by surface magneto-optic Kerr effect (SMOKE). After being exposed on the 15-30 monolayers (ML) Co/Ge(1 1 1) films, the oxygen atoms only distribute on the topmost layer of Co films. The oxygen layer influences the electronic density of states of Co only on the topmost layer and leads to reduction in the saturated magnetization. Besides, the appearance of the Co/O interface forms additional interfacial anisotropy; consequently, coercivity of ultrathin Co/Ge(1 1 1) film is enhanced. As an example for 15 ML Co/Ge(1 1 1), the coercivity increases from 730 to 920 Oe with 200 L of oxygen exposure. Besides, the film with thinner Co layer exhibits stronger coercivity enhancement effect after exposing 200 L oxygen.",

keywords = "Co/O interface, Coercivity, Surface magneto-optic Kerr effect, Ultrathin magnetic film",

author = "Chang, {H. W.} and Tsay, {J. S.} and Chiou, {Y. L.} and Huang, {K. T.} and Chan, {W. Y.} and Yao, {Y. D.}",

note = "Funding Information: Authors deeply appreciate the financial support by National Science Council, Taiwan under grant no. NSC-94-2120-M-001-004.",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.11.114",

language = "English",

volume = "310",

pages = "e741--e742",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "2 SUPPL. PART 3",

}

TY - JOUR

T1 - Coercivity enhancement of ultrathin Co/Ge(1 1 1) films by Co/O interfacial anisotropy

AU - Chang, H. W.

AU - Tsay, J. S.

AU - Chiou, Y. L.

AU - Huang, K. T.

AU - Chan, W. Y.

AU - Yao, Y. D.

N1 - Funding Information: Authors deeply appreciate the financial support by National Science Council, Taiwan under grant no. NSC-94-2120-M-001-004.

PY - 2007/3

Y1 - 2007/3

N2 - Magnetic properties of oxygen exposed on the ultrathin Co/Ge(1 1 1) films have been investigated by surface magneto-optic Kerr effect (SMOKE). After being exposed on the 15-30 monolayers (ML) Co/Ge(1 1 1) films, the oxygen atoms only distribute on the topmost layer of Co films. The oxygen layer influences the electronic density of states of Co only on the topmost layer and leads to reduction in the saturated magnetization. Besides, the appearance of the Co/O interface forms additional interfacial anisotropy; consequently, coercivity of ultrathin Co/Ge(1 1 1) film is enhanced. As an example for 15 ML Co/Ge(1 1 1), the coercivity increases from 730 to 920 Oe with 200 L of oxygen exposure. Besides, the film with thinner Co layer exhibits stronger coercivity enhancement effect after exposing 200 L oxygen.

AB - Magnetic properties of oxygen exposed on the ultrathin Co/Ge(1 1 1) films have been investigated by surface magneto-optic Kerr effect (SMOKE). After being exposed on the 15-30 monolayers (ML) Co/Ge(1 1 1) films, the oxygen atoms only distribute on the topmost layer of Co films. The oxygen layer influences the electronic density of states of Co only on the topmost layer and leads to reduction in the saturated magnetization. Besides, the appearance of the Co/O interface forms additional interfacial anisotropy; consequently, coercivity of ultrathin Co/Ge(1 1 1) film is enhanced. As an example for 15 ML Co/Ge(1 1 1), the coercivity increases from 730 to 920 Oe with 200 L of oxygen exposure. Besides, the film with thinner Co layer exhibits stronger coercivity enhancement effect after exposing 200 L oxygen.

KW - Co/O interface

KW - Coercivity

KW - Surface magneto-optic Kerr effect

KW - Ultrathin magnetic film

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JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SUPPL. PART 3

ER -

Coercivity enhancement of ultrathin Co/Ge(1 1 1) films by Co/O interfacial anisotropy

Abstract

Keywords

ASJC Scopus subject areas

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