Room temperature ferromagnetism in sol-gel prepared Co-doped ZnO

被引：20

作者：

Varshney, Prateek ^{[1
]}

Srinet, Gunjan ^{[1
]}

Kumar, Ravindra ^{[1
]}

Sajal, Vivek ^{[1
]}

Sharma, S. K. ^{[2
]}

Knobel, M. ^{[2
]}

Chandra, Jeewan ^{[3
]}

Gupta, Govind ^{[4
]}

Kulriya, P. K. ^{[5
]}

机构：

[1] Jaypee Inst Informat Technol, Dept Phys & Mat Sci & Engn, Noida 201307, Uttar Pradesh, India

[2] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil

[3] Natl Inst Technol, Srinagar, Uttarakhand, India

[4] Natl Phys Lab, New Delhi 110012, India

[5] Interuniv Accelerator Ctr, New Delhi, India

来源：

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING | 2012年 / 15卷 / 03期

关键词：

Diluted magnetic semiconductors; ZnO; MAGNETIC-PROPERTIES; MN; SPINTRONICS; NI;

D O I：

10.1016/j.mssp.2012.02.002

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report on the high temperature ferromagnetism in Co-doped ZnO samples with 2%, 4% and 6% nominal Co concentrations prepared by the sol-gel method. X-ray diffraction and X-ray photoelectron spectroscopy analyses confirm the absence of metallic Co clusters or any other impurity phases different from wurtzite-type ZnO. It is also observed that Co has occupied Zn sites. UV-visible absorption studies show an increase in band gap with Co concentration. The field dependence of magnetization exhibited clear ferromagnetism at room temperature with saturation magnetization and coercive field of the order of 0.0066-0.0239 emu/g and 149.09-40.31 Oe, respectively. Increase of saturation magnetization value with Co doping indicated that the ferromagnetism in the samples may be due to percolation of bound magnetic polarons. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：314 / 318

页数：5

共 25 条

[1] [Anonymous], 1995, Handbook of X-ray Photoelectron Spectroscopy. A Reference Book of Standard Spectra for Identification and Interpretation of XPS Data
[2] The effect of Al3+ co-doping on the structural, magnetic and optical properties of ZnCoO thin films
Cao, P.
Bai, Y.
Zhao, D. X.
Shen, D. Z.
[J]. MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, 2011, 14 (01) : 73 - 77
[3] Donor impurity band exchange in dilute ferromagnetic oxides
Coey, JMD
Venkatesan, M
Fitzgerald, CB
[J]. NATURE MATERIALS, 2005, 4 (02) : 173 - 179
[4] Cullity B. D., 1978, ELEMENTS XRAY DIFFRA
[5] Origin of ferromagnetism in Zn1-xCoxO from magnetization and spin-dependent magnetoresistance measurements
Dietl, T.
Andrearczyk, T.
Lipinska, A.
Kiecana, M.
Tay, Maureen
Wu, Yihong
[J]. PHYSICAL REVIEW B, 2007, 76 (15)
[6] Zener model description of ferromagnetism in zinc-blende magnetic semiconductors
Dietl, T
Ohno, H
Matsukura, F
Cibert, J
Ferrand, D
[J]. SCIENCE, 2000, 287 (5455) : 1019 - 1022
[7] Evidence of oxygen vacancy enhanced room-temperature ferromagnetism in Co-doped ZnO
Hsu, H. S.
Huang, J. C. A.
Huang, Y. H.
Liao, Y. F.
Lin, M. Z.
Lee, C. H.
Lee, J. F.
Chen, S. F.
Lai, L. Y.
Liu, C. P.
[J]. APPLIED PHYSICS LETTERS, 2006, 88 (24)
[8] Oxygen vacancies and ferromagnetism in CoxTi1-xO2-x-y -: art. no. 073908
Jaffe, JE
Droubay, TC
Chambers, SA
[J]. JOURNAL OF APPLIED PHYSICS, 2005, 97 (07)
[9] Structural and magnetic properties of transition metal substituted ZnO
Kolesnik, S
Dabrowski, B
Mais, J
[J]. JOURNAL OF APPLIED PHYSICS, 2004, 95 (05) : 2582 - 2586
[10] On the origin of high-temperature ferromagnetism in the low-temperature-processed Mn-Zn-O system
Kundaliya, DC
Ogale, SB
Lofland, SE
Dhar, S
Metting, CJ
Shinde, SR
Ma, Z
Varughese, B
Ramanujachary, KV
Salamanca-Riba, L
Venkatesan, T
[J]. NATURE MATERIALS, 2004, 3 (10) : 709 - 714

← 1 2 3 →