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 language | English |
|---|---|
| Article number | 325705 |
| Journal | Nanotechnology |
| Volume | 18 |
| Issue number | 32 |
| DOIs | |
| Publication status | Published - 2007 Aug 15 |
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All Science Journal Classification (ASJC) codes
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering
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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 journal › Article
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.
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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 -