Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods

S. Dhara, Jih-Jen Wu, G. Mangamma, S. Bera, C. T. Wu, P. Magudapathy, C. C. Yu, M. Kamruddin, K. G.M. Nair, A. K. Tyagi, L. C. Chen, K. H. Chen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Long-range ferromagnetic ordering at room temperature is reported for post-annealed TiO2 nanorods doped with Co2+ by an ion implantation technique. The catalyst free anatase TiO2 nanorods are grown normal to the substrate plane. A Curie temperature of ∼320 K was recorded for a ∼9 at.% Co doped sample. Electronic structural studies confirm the substitutional Co in the Ti lattice site. Microstructural studies show the presence of extended defects, where a minor nonuniformity in doping concentration helps to sustain the intrinsic ferromagnetic ordering in Co doped TiO2 at room temperature. The projected nanorod tip size is found to be smaller than a single magnetic domain, which may lead to an increased signal-to-noise ratio for magnetic recording.

Original languageEnglish
Article number325705
JournalNanotechnology
Volume18
Issue number32
DOIs
Publication statusPublished - 2007 Aug 15

Fingerprint

Nanorods
Magnetic domains
Magnetic recording
Curie temperature
Ion implantation
Titanium dioxide
Temperature
Signal to noise ratio
Doping (additives)
Defects
Catalysts
Substrates

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Dhara, S., Wu, J-J., Mangamma, G., Bera, S., Wu, C. T., Magudapathy, P., ... Chen, K. H. (2007). Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods. Nanotechnology, 18(32), [325705]. https://doi.org/10.1088/0957-4484/18/32/325705
Dhara, S. ; Wu, Jih-Jen ; Mangamma, G. ; Bera, S. ; Wu, C. T. ; Magudapathy, P. ; Yu, C. C. ; Kamruddin, M. ; Nair, K. G.M. ; Tyagi, A. K. ; Chen, L. C. ; Chen, K. H. / Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods. In: Nanotechnology. 2007 ; Vol. 18, No. 32.
@article{9fe3b61eb3b9475a8e5af00798df75dd,
title = "Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods",
abstract = "Long-range ferromagnetic ordering at room temperature is reported for post-annealed TiO2 nanorods doped with Co2+ by an ion implantation technique. The catalyst free anatase TiO2 nanorods are grown normal to the substrate plane. A Curie temperature of ∼320 K was recorded for a ∼9 at.{\%} Co doped sample. Electronic structural studies confirm the substitutional Co in the Ti lattice site. Microstructural studies show the presence of extended defects, where a minor nonuniformity in doping concentration helps to sustain the intrinsic ferromagnetic ordering in Co doped TiO2 at room temperature. The projected nanorod tip size is found to be smaller than a single magnetic domain, which may lead to an increased signal-to-noise ratio for magnetic recording.",
author = "S. Dhara and Jih-Jen Wu and G. Mangamma and S. Bera and Wu, {C. T.} and P. Magudapathy and Yu, {C. C.} and M. Kamruddin and Nair, {K. G.M.} and Tyagi, {A. K.} and Chen, {L. C.} and Chen, {K. H.}",
year = "2007",
month = "8",
day = "15",
doi = "10.1088/0957-4484/18/32/325705",
language = "English",
volume = "18",
journal = "Nanotechnology",
issn = "0957-4484",
publisher = "IOP Publishing Ltd.",
number = "32",

}

Dhara, S, Wu, J-J, Mangamma, G, Bera, S, Wu, CT, Magudapathy, P, Yu, CC, Kamruddin, M, Nair, KGM, Tyagi, AK, Chen, LC & Chen, KH 2007, 'Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods', Nanotechnology, vol. 18, no. 32, 325705. https://doi.org/10.1088/0957-4484/18/32/325705

Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods. / Dhara, S.; Wu, Jih-Jen; Mangamma, G.; Bera, S.; Wu, C. T.; Magudapathy, P.; Yu, C. C.; Kamruddin, M.; Nair, K. G.M.; Tyagi, A. K.; Chen, L. C.; Chen, K. H.

In: Nanotechnology, Vol. 18, No. 32, 325705, 15.08.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Long-range ferromagnetic ordering at room temperature in Co+ implanted TiO2 nanorods

AU - Dhara, S.

AU - Wu, Jih-Jen

AU - Mangamma, G.

AU - Bera, S.

AU - Wu, C. T.

AU - Magudapathy, P.

AU - Yu, C. C.

AU - Kamruddin, M.

AU - Nair, K. G.M.

AU - Tyagi, A. K.

AU - Chen, L. C.

AU - Chen, K. H.

PY - 2007/8/15

Y1 - 2007/8/15

N2 - Long-range ferromagnetic ordering at room temperature is reported for post-annealed TiO2 nanorods doped with Co2+ by an ion implantation technique. The catalyst free anatase TiO2 nanorods are grown normal to the substrate plane. A Curie temperature of ∼320 K was recorded for a ∼9 at.% Co doped sample. Electronic structural studies confirm the substitutional Co in the Ti lattice site. Microstructural studies show the presence of extended defects, where a minor nonuniformity in doping concentration helps to sustain the intrinsic ferromagnetic ordering in Co doped TiO2 at room temperature. The projected nanorod tip size is found to be smaller than a single magnetic domain, which may lead to an increased signal-to-noise ratio for magnetic recording.

AB - Long-range ferromagnetic ordering at room temperature is reported for post-annealed TiO2 nanorods doped with Co2+ by an ion implantation technique. The catalyst free anatase TiO2 nanorods are grown normal to the substrate plane. A Curie temperature of ∼320 K was recorded for a ∼9 at.% Co doped sample. Electronic structural studies confirm the substitutional Co in the Ti lattice site. Microstructural studies show the presence of extended defects, where a minor nonuniformity in doping concentration helps to sustain the intrinsic ferromagnetic ordering in Co doped TiO2 at room temperature. The projected nanorod tip size is found to be smaller than a single magnetic domain, which may lead to an increased signal-to-noise ratio for magnetic recording.

UR - http://www.scopus.com/inward/record.url?scp=34547130314&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547130314&partnerID=8YFLogxK

U2 - 10.1088/0957-4484/18/32/325705

DO - 10.1088/0957-4484/18/32/325705

M3 - Article

AN - SCOPUS:34547130314

VL - 18

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 32

M1 - 325705

ER -