Cobalt inhomogeneity in rutile Ti 0.93Co 0.07O 2 thin films and its relation to room-temperature ferromagnetism

D. H. Kim; K. W. Lee; J. S. Yang; T. W. Noh; S. D. Bu; Y. W. Kim; R. Jung

Cobalt inhomogeneity in rutile Ti _0.93Co _0.07O ₂ thin films and its relation to room-temperature ferromagnetism

D. H. Kim^*
, K. W. Lee
, J. S. Yang
, T. W. Noh
, S. D. Bu
, Y. W. Kim
, R. Jung

^*Corresponding author for this work

Department of Physics

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

7 Scopus citations

Abstract

Rutile Ti _0.93Co _0.07O ₂ films with (101) orientations were grown on α-Al ₂O ₃ (101̄2) substrates by using pulsed laser deposition. The magnetic and the structural properties of the rutile films showed strong dependences on Po ₂. The films showed ferromagnetism (FM) at room temperature with low Po ₂ ≤ 1.0 × 10 ^-5, and the FM was suppressed with increasing Po ₂. X-ray diffraction measurements showed that the films grown at Po ₂ > 1.0 × 10 ^-4 Torr contained a second phase of CoTiO ₃, which did not exhibit FM at room temperature. In the films with strong ferromagnetism, Co nanoclusters were formed, which were investigated by X-ray photoemission spectroscopy and cross-sectional transmission electron microscopy. Our systematic study suggests that the Co clustering might be the main origin of the observed FM in our Co doped rutile TiO ₂ thin films.

Original language	English
Pages (from-to)	503-507
Number of pages	5
Journal	Journal of the Korean Physical Society
Volume	46
Issue number	2
State	Published - 2005.02

Keywords

Cobalt cluster
Cobalt doped TiO
Magnetic semiconductor
Rutile

Quacquarelli Symonds(QS) Subject Topics

Physics & Astronomy

Cite this

@article{bd78cfc68a78464595300023f3ee9510,

title = "Cobalt inhomogeneity in rutile Ti 0.93Co 0.07O 2 thin films and its relation to room-temperature ferromagnetism",

abstract = "Rutile Ti 0.93Co 0.07O 2 films with (101) orientations were grown on α-Al 2O 3 (10{\=1}2) substrates by using pulsed laser deposition. The magnetic and the structural properties of the rutile films showed strong dependences on Po 2. The films showed ferromagnetism (FM) at room temperature with low Po 2 ≤ 1.0 × 10 -5, and the FM was suppressed with increasing Po 2. X-ray diffraction measurements showed that the films grown at Po 2 > 1.0 × 10 -4 Torr contained a second phase of CoTiO 3, which did not exhibit FM at room temperature. In the films with strong ferromagnetism, Co nanoclusters were formed, which were investigated by X-ray photoemission spectroscopy and cross-sectional transmission electron microscopy. Our systematic study suggests that the Co clustering might be the main origin of the observed FM in our Co doped rutile TiO 2 thin films.",

keywords = "Cobalt cluster, Cobalt doped TiO, Magnetic semiconductor, Rutile",

author = "Kim, \{D. H.\} and Lee, \{K. W.\} and Yang, \{J. S.\} and Noh, \{T. W.\} and Bu, \{S. D.\} and Kim, \{Y. W.\} and R. Jung",

year = "2005",

month = feb,

language = "English",

volume = "46",

pages = "503--507",

journal = "Journal of the Korean Physical Society",

issn = "0374-4884",

number = "2",

}

TY - JOUR

T1 - Cobalt inhomogeneity in rutile Ti 0.93Co 0.07O 2 thin films and its relation to room-temperature ferromagnetism

AU - Kim, D. H.

AU - Lee, K. W.

AU - Yang, J. S.

AU - Noh, T. W.

AU - Bu, S. D.

AU - Kim, Y. W.

AU - Jung, R.

PY - 2005/2

Y1 - 2005/2

N2 - Rutile Ti 0.93Co 0.07O 2 films with (101) orientations were grown on α-Al 2O 3 (101̄2) substrates by using pulsed laser deposition. The magnetic and the structural properties of the rutile films showed strong dependences on Po 2. The films showed ferromagnetism (FM) at room temperature with low Po 2 ≤ 1.0 × 10 -5, and the FM was suppressed with increasing Po 2. X-ray diffraction measurements showed that the films grown at Po 2 > 1.0 × 10 -4 Torr contained a second phase of CoTiO 3, which did not exhibit FM at room temperature. In the films with strong ferromagnetism, Co nanoclusters were formed, which were investigated by X-ray photoemission spectroscopy and cross-sectional transmission electron microscopy. Our systematic study suggests that the Co clustering might be the main origin of the observed FM in our Co doped rutile TiO 2 thin films.

AB - Rutile Ti 0.93Co 0.07O 2 films with (101) orientations were grown on α-Al 2O 3 (101̄2) substrates by using pulsed laser deposition. The magnetic and the structural properties of the rutile films showed strong dependences on Po 2. The films showed ferromagnetism (FM) at room temperature with low Po 2 ≤ 1.0 × 10 -5, and the FM was suppressed with increasing Po 2. X-ray diffraction measurements showed that the films grown at Po 2 > 1.0 × 10 -4 Torr contained a second phase of CoTiO 3, which did not exhibit FM at room temperature. In the films with strong ferromagnetism, Co nanoclusters were formed, which were investigated by X-ray photoemission spectroscopy and cross-sectional transmission electron microscopy. Our systematic study suggests that the Co clustering might be the main origin of the observed FM in our Co doped rutile TiO 2 thin films.

KW - Cobalt cluster

KW - Cobalt doped TiO

KW - Magnetic semiconductor

KW - Rutile

UR - https://www.scopus.com/pages/publications/14644396557

M3 - Journal article

AN - SCOPUS:14644396557

SN - 0374-4884

VL - 46

SP - 503

EP - 507

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

IS - 2

ER -

Cobalt inhomogeneity in rutile Ti _0.93Co _0.07O ₂ thin films and its relation to room-temperature ferromagnetism

Abstract

Keywords

Quacquarelli Symonds(QS) Subject Topics

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