Ferromagnetism in laser deposited anatase Ti1-xCoxO2-δ films

S. R. Shinde; S. B. Ogale; S. Das Sarma; J. R. Simpson; H. D. Drew; S. E. Lofland; C. Lanci; J. P. Buban; N. D. Browning; V. N. Kulkarni; J. Higgins; R. P. Sharma; R. L. Greene; T. Venkatesan

Ferromagnetism in laser deposited anatase Ti_1-xCo_xO_2-δ films

S. R. Shinde, S. B. Ogale, S. Das Sarma, J. R. Simpson, H. D. Drew, S. E. Lofland, C. Lanci, J. P. Buban, N. D. Browning, V. N. Kulkarni, J. Higgins, R. P. Sharma, R. L. Greene, T. Venkatesan

Physics

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

237 Scopus citations

Abstract

Pulsed laser deposited films of Co-doped anatase TiO₂ are examined for Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties. Our results show limited solubility (up to ∼2%) of Co in the as-grown films and formation of Co clusters thereafter. For the Ti_0.93Co_0.07O_2-δ sample, which exhibits a Curie temperature (T_C) over 1180 K, we find the presence of 20-50 nm Co clusters as well as a small concentration of CO incorporated into the remaining matrix. After being subjected to the hightemperature anneal during the first magnetization measurement, the very same sample shows a T_C650 K and almost full matrix incorporation of Co. This T_C is close to that of as-grown Ti_0.99Co_0.01O_2-δ sample (∼700 K). The transport, magnetotransport, and optical studies also reveal interesting effects of the matrix incorporation of Co. These results are indicative of an intrinsic Ti_1-xCo_xO_2-δ diluted magnetic semiconductor with T_C of about 650-700 K.

Original language	English (US)
Article number	115211
Pages (from-to)	1152111-1152116
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	67
Issue number	11
State	Published - Mar 2003

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

Shinde, S. R., Ogale, S. B., Das Sarma, S., Simpson, J. R., Drew, H. D., Lofland, S. E., Lanci, C., Buban, J. P., Browning, N. D., Kulkarni, V. N., Higgins, J., Sharma, R. P., Greene, R. L., & Venkatesan, T. (2003). Ferromagnetism in laser deposited anatase Ti_1-xCo_xO_2-δ films. Physical Review B - Condensed Matter and Materials Physics, 67(11), 1152111-1152116. Article 115211.

@article{8811f0a1715e456288e7e480eb5cb12e,

title = "Ferromagnetism in laser deposited anatase Ti1-xCoxO2-δ films",

abstract = "Pulsed laser deposited films of Co-doped anatase TiO2 are examined for Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties. Our results show limited solubility (up to ∼2%) of Co in the as-grown films and formation of Co clusters thereafter. For the Ti0.93Co0.07O2-δ sample, which exhibits a Curie temperature (TC) over 1180 K, we find the presence of 20-50 nm Co clusters as well as a small concentration of CO incorporated into the remaining matrix. After being subjected to the hightemperature anneal during the first magnetization measurement, the very same sample shows a TC650 K and almost full matrix incorporation of Co. This TC is close to that of as-grown Ti0.99Co0.01O2-δ sample (∼700 K). The transport, magnetotransport, and optical studies also reveal interesting effects of the matrix incorporation of Co. These results are indicative of an intrinsic Ti1-xCoxO2-δ diluted magnetic semiconductor with TC of about 650-700 K.",

author = "Shinde, {S. R.} and Ogale, {S. B.} and {Das Sarma}, S. and Simpson, {J. R.} and Drew, {H. D.} and Lofland, {S. E.} and C. Lanci and Buban, {J. P.} and Browning, {N. D.} and Kulkarni, {V. N.} and J. Higgins and Sharma, {R. P.} and Greene, {R. L.} and T. Venkatesan",

year = "2003",

month = mar,

language = "English (US)",

volume = "67",

pages = "1152111--1152116",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "0163-1829",

publisher = "American Physical Society",

number = "11",

}

TY - JOUR

T1 - Ferromagnetism in laser deposited anatase Ti1-xCoxO2-δ films

AU - Shinde, S. R.

AU - Ogale, S. B.

AU - Das Sarma, S.

AU - Simpson, J. R.

AU - Drew, H. D.

AU - Lofland, S. E.

AU - Lanci, C.

AU - Buban, J. P.

AU - Browning, N. D.

AU - Kulkarni, V. N.

AU - Higgins, J.

AU - Sharma, R. P.

AU - Greene, R. L.

AU - Venkatesan, T.

PY - 2003/3

Y1 - 2003/3

N2 - Pulsed laser deposited films of Co-doped anatase TiO2 are examined for Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties. Our results show limited solubility (up to ∼2%) of Co in the as-grown films and formation of Co clusters thereafter. For the Ti0.93Co0.07O2-δ sample, which exhibits a Curie temperature (TC) over 1180 K, we find the presence of 20-50 nm Co clusters as well as a small concentration of CO incorporated into the remaining matrix. After being subjected to the hightemperature anneal during the first magnetization measurement, the very same sample shows a TC650 K and almost full matrix incorporation of Co. This TC is close to that of as-grown Ti0.99Co0.01O2-δ sample (∼700 K). The transport, magnetotransport, and optical studies also reveal interesting effects of the matrix incorporation of Co. These results are indicative of an intrinsic Ti1-xCoxO2-δ diluted magnetic semiconductor with TC of about 650-700 K.

AB - Pulsed laser deposited films of Co-doped anatase TiO2 are examined for Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties. Our results show limited solubility (up to ∼2%) of Co in the as-grown films and formation of Co clusters thereafter. For the Ti0.93Co0.07O2-δ sample, which exhibits a Curie temperature (TC) over 1180 K, we find the presence of 20-50 nm Co clusters as well as a small concentration of CO incorporated into the remaining matrix. After being subjected to the hightemperature anneal during the first magnetization measurement, the very same sample shows a TC650 K and almost full matrix incorporation of Co. This TC is close to that of as-grown Ti0.99Co0.01O2-δ sample (∼700 K). The transport, magnetotransport, and optical studies also reveal interesting effects of the matrix incorporation of Co. These results are indicative of an intrinsic Ti1-xCoxO2-δ diluted magnetic semiconductor with TC of about 650-700 K.

UR - http://www.scopus.com/inward/record.url?scp=0037880472&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037880472&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0037880472

SN - 0163-1829

VL - 67

SP - 1152111

EP - 1152116

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 11

M1 - 115211

ER -

Ferromagnetism in laser deposited anatase Ti_1-xCo_xO_2-δ films

Abstract

All Science Journal Classification (ASJC) codes

Other files and links

Fingerprint

Cite this