Structural and magnetic properties of wurtzite CoO thin films

被引：21

作者：

Alaria, J. ^{[1
]}

Cheval, N. ^{[1
]}

Rode, K. ^{[1
]}

Venkatesan, M. ^{[1
]}

Coey, J. M. D. ^{[1
]}

机构：

[1] Univ Dublin Trinity Coll, Sch Phys & CRANN, Dublin 2, Ireland

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2008年 / 41卷 / 13期

关键词：

D O I：

10.1088/0022-3727/41/13/135004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Hexagonal CoO thin films on (0 0 0 1) Al2O3 and ZnO are prepared by off-axis and on-axis pulsed laser deposition. The structural properties were studied by in situ reflection high-energy electron diffraction and ex situ x-ray diffraction. The magnetic properties of the films depend on the mode of growth. The films grown in a normal geometry are a mixture of Co3O4 and CoO and show ferromagnetism at room temperature, whereas the films grown off-axis are single phase and present a Curie-Weiss behaviour. Wurtzite CoO does not order magnetically because the antiferromagnetic Co2+-O2--Co2+ superexchange is geometrically frustrated. It is proposed that defective Co3O4 in thin films is ferrimagnetic, due to the appearance of high spin Co3+ on B sites.

引用

页数：6

共 22 条

[11] Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide
Matsumoto, Y
Murakami, M
Shono, T
Hasegawa, T
Fukumura, T
Kawasaki, M
Ahmet, P
Chikyow, T
Koshihara, S
Koinuma, H
[J]. SCIENCE, 2001, 291 (5505) : 854 - 856
[12] OGALE SB, 2006, THIN FILMS HETEROSTR, pCH6
[13] Ohno H, 2002, SEMICOND SCI TECH, V17
[14] Rao C.N.R, 1974, Transition Metal Oxides Crystal Chemistry, Phase Transistion and Related Aspects
[15] Wurtzite CoO
Risbud, AS
Snedeker, LP
Elcombe, MM
Cheetham, AK
Seshadri, R
[J]. CHEMISTRY OF MATERIALS, 2005, 17 (04) : 834 - 838
[16] Magnetism of (Zn,Co)O thin films probed by x-ray absorption spectroscopies
Rode, K.
Mattana, R.
Anane, A.
Cros, V.
Jacquet, E.
Contour, J. -P.
Petroff, F.
Fert, A.
Arrio, M. -A.
Sainctavit, Ph.
Bencok, P.
Wilhelm, F.
Brookes, N. B.
Rogalev, A.
[J]. APPLIED PHYSICS LETTERS, 2008, 92 (01)
[17] MAGNETIC STRUCTURE OF C03O4
ROTH, WL
[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1964, 25 (01) : 1 - &
[18] Phase- and size-controlled synthesis of hexagonal and cubic CoO nanocrystals
Seo, WS
Shim, JH
Oh, SJ
Lee, EK
Hur, NH
Park, JT
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (17) : 6188 - 6189
[19] Generation of high spin state in the spinel Co3O4 nano-domains through interfacial induction
Tay, Siok Wei
Hong, Liang
Liu, Zhaolin
[J]. MATERIALS CHEMISTRY AND PHYSICS, 2006, 100 (01) : 60 - 67
[20] Anisotropic ferromagnetism in substituted zinc oxide
Venkatesan, M
Fitzgerald, CB
Lunney, JG
Coey, JMD
[J]. PHYSICAL REVIEW LETTERS, 2004, 93 (17) : 177206 - 1

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