Characteristics of cobalt-doped zinc oxide thin films prepared by pulsed laser deposition

Jae Hyun Kim; Jae Bong Lee; Hyojin Kim; Dojin Kim; Young Eon Ihm; Woong Kil Choo

doi:10.1109/TMAG.2002.803132

Characteristics of cobalt-doped zinc oxide thin films prepared by pulsed laser deposition

Jae Hyun Kim, Jae Bong Lee, Hyojin Kim, Dojin Kim, Young Eon Ihm, Woong Kil Choo

Division of Energy Techonology

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

18 Scopus citations

Abstract

We have characterized Zn_1-xCo_xO thin films grown on sapphire (0001) substrates by pulsed laser deposition. We have found for x = 0.25 that inhomogeneous Zn_1-xCo_xO films with wurtzite ZnO phase mixed with rock-salt CoO and hexagonal Co phases are formed when the growth temperature (T_g) is relatively high (≳600 °C) and the O₂ pressure (P_O2) is fairly low (≲10^-5 torr). The presence of the Co clusters leads to room temperature ferromagnetism. Homogeneous Zn_1-xCo_xO alloy films with wurtzite structure are predominantly paramagnetic. High-quality epitaxial Zn_1-xCo_xO alloy films are formed at a growth condition of T_g = 600 °C and P_O2 = 10^-5 torr. Under this optimized growth condition, Co can be dissolved into ZnO up to around 40%. Photoluminescence spectra and electrical properties of Zn_1-xCo_xO strongly depend on the Co content.

Original language	English
Pages (from-to)	2880-2882
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	38
Issue number	5 I
DOIs	https://doi.org/10.1109/TMAG.2002.803132
State	Published - Sep 2002
Event	2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands Duration: 28 Apr 2002 → 2 May 2002

Bibliographical note

Funding Information:
Manuscript received February 14, 2002; revised April 5, 2002. This work was supported by the National Program for Tera-level Nanodevices of the MOST as one of the 21 Century Frontier Programs and by the KOSEF through the Research Center for Advanced Magnetic Materials.

Keywords

Diluted magnetic semiconductors
Pulsed laser deposition
Spin electronics
ZnCoO

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title = "Characteristics of cobalt-doped zinc oxide thin films prepared by pulsed laser deposition",

abstract = "We have characterized Zn1-xCoxO thin films grown on sapphire (0001) substrates by pulsed laser deposition. We have found for x = 0.25 that inhomogeneous Zn1-xCoxO films with wurtzite ZnO phase mixed with rock-salt CoO and hexagonal Co phases are formed when the growth temperature (Tg) is relatively high (≳600 °C) and the O2 pressure (PO2) is fairly low (≲10-5 torr). The presence of the Co clusters leads to room temperature ferromagnetism. Homogeneous Zn1-xCoxO alloy films with wurtzite structure are predominantly paramagnetic. High-quality epitaxial Zn1-xCoxO alloy films are formed at a growth condition of Tg = 600 °C and PO2 = 10-5 torr. Under this optimized growth condition, Co can be dissolved into ZnO up to around 40%. Photoluminescence spectra and electrical properties of Zn1-xCoxO strongly depend on the Co content.",

keywords = "Diluted magnetic semiconductors, Pulsed laser deposition, Spin electronics, ZnCoO",

author = "Kim, {Jae Hyun} and Lee, {Jae Bong} and Hyojin Kim and Dojin Kim and Ihm, {Young Eon} and Choo, {Woong Kil}",

note = "Funding Information: Manuscript received February 14, 2002; revised April 5, 2002. This work was supported by the National Program for Tera-level Nanodevices of the MOST as one of the 21 Century Frontier Programs and by the KOSEF through the Research Center for Advanced Magnetic Materials.; 2002 International Magnetics Conference (Intermag 2002) ; Conference date: 28-04-2002 Through 02-05-2002",

year = "2002",

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volume = "38",

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T1 - Characteristics of cobalt-doped zinc oxide thin films prepared by pulsed laser deposition

AU - Kim, Jae Hyun

AU - Lee, Jae Bong

AU - Kim, Hyojin

AU - Kim, Dojin

AU - Ihm, Young Eon

AU - Choo, Woong Kil

N1 - Funding Information: Manuscript received February 14, 2002; revised April 5, 2002. This work was supported by the National Program for Tera-level Nanodevices of the MOST as one of the 21 Century Frontier Programs and by the KOSEF through the Research Center for Advanced Magnetic Materials.

PY - 2002/9

Y1 - 2002/9

N2 - We have characterized Zn1-xCoxO thin films grown on sapphire (0001) substrates by pulsed laser deposition. We have found for x = 0.25 that inhomogeneous Zn1-xCoxO films with wurtzite ZnO phase mixed with rock-salt CoO and hexagonal Co phases are formed when the growth temperature (Tg) is relatively high (≳600 °C) and the O2 pressure (PO2) is fairly low (≲10-5 torr). The presence of the Co clusters leads to room temperature ferromagnetism. Homogeneous Zn1-xCoxO alloy films with wurtzite structure are predominantly paramagnetic. High-quality epitaxial Zn1-xCoxO alloy films are formed at a growth condition of Tg = 600 °C and PO2 = 10-5 torr. Under this optimized growth condition, Co can be dissolved into ZnO up to around 40%. Photoluminescence spectra and electrical properties of Zn1-xCoxO strongly depend on the Co content.

AB - We have characterized Zn1-xCoxO thin films grown on sapphire (0001) substrates by pulsed laser deposition. We have found for x = 0.25 that inhomogeneous Zn1-xCoxO films with wurtzite ZnO phase mixed with rock-salt CoO and hexagonal Co phases are formed when the growth temperature (Tg) is relatively high (≳600 °C) and the O2 pressure (PO2) is fairly low (≲10-5 torr). The presence of the Co clusters leads to room temperature ferromagnetism. Homogeneous Zn1-xCoxO alloy films with wurtzite structure are predominantly paramagnetic. High-quality epitaxial Zn1-xCoxO alloy films are formed at a growth condition of Tg = 600 °C and PO2 = 10-5 torr. Under this optimized growth condition, Co can be dissolved into ZnO up to around 40%. Photoluminescence spectra and electrical properties of Zn1-xCoxO strongly depend on the Co content.

KW - Diluted magnetic semiconductors

KW - Pulsed laser deposition

KW - Spin electronics

KW - ZnCoO

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U2 - 10.1109/TMAG.2002.803132

DO - 10.1109/TMAG.2002.803132

M3 - Conference article

AN - SCOPUS:0036761710

SN - 0018-9464

VL - 38

SP - 2880

EP - 2882

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 5 I

T2 - 2002 International Magnetics Conference (Intermag 2002)

Y2 - 28 April 2002 through 2 May 2002

ER -

Characteristics of cobalt-doped zinc oxide thin films prepared by pulsed laser deposition

Abstract

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Keywords

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