Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 102-108 |
| Number of pages | 7 |
| Journal | Journal Of Magnetism And Magnetic Materials |
| Volume | 340 |
| DOIs | |
| Publication status | Published - Aug 2013 |
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Keywords
- Magnetic aggregate
- Nickel nanoparticle
- Titanium dioxide
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Formation of oriented nickel aggregates in rutile single crystals by Ni implantation. / Cruz, M. M.; Silva, R. C. da; Pinto, J. V.; Borges, R. P.; Franco, N.; Casaca, A.; Alves, E.; Godinho, M.
In: Journal Of Magnetism And Magnetic Materials, Vol. 340, 08.2013, p. 102-108.Research output: Contribution to journal › Article
TY - JOUR
T1 - Formation of oriented nickel aggregates in rutile single crystals by Ni implantation
AU - Cruz, M. M.
AU - Silva, R. C. da
AU - Pinto, J. V.
AU - Borges, R. P.
AU - Franco, N.
AU - Casaca, A.
AU - Alves, E.
AU - Godinho, M.
N1 - This work was partially supported by the Portuguese foundation FCT by a Ph.D. Grant (BD/8907/2002) to J.V. Pinto.
PY - 2013/8
Y1 - 2013/8
N2 - The magnetic and electrical properties of Ni implanted single crystalline TiO2 rutile were studied for nominal implanted fluences between 0.5×1017 cm-2 and 2.0×1017 cm -2 with 150 keV energy, corresponding to maximum atomic concentrations between 9 at% and 27 at% at 65 nm depth, in order to study the formation of metallic oriented aggregates. The results indicate that the as implanted crystals exhibit superparamagnetic behavior for the two higher fluences, which is attributed to the formation of nanosized nickel clusters with an average size related with the implanted concentration, while only paramagnetic behavior is observed for the lowest fluence. Annealing at 1073 K induces the aggregation of the implanted nickel and enhances the magnetization in all samples. The associated anisotropic behavior indicates preferred orientations of the nickel aggregates in the rutile lattice consistent with Rutherford backscattering spectrometry - channelling results. Electrical conductivity displays anisotropic behavior but no magnetoresistive effects were detected.
AB - The magnetic and electrical properties of Ni implanted single crystalline TiO2 rutile were studied for nominal implanted fluences between 0.5×1017 cm-2 and 2.0×1017 cm -2 with 150 keV energy, corresponding to maximum atomic concentrations between 9 at% and 27 at% at 65 nm depth, in order to study the formation of metallic oriented aggregates. The results indicate that the as implanted crystals exhibit superparamagnetic behavior for the two higher fluences, which is attributed to the formation of nanosized nickel clusters with an average size related with the implanted concentration, while only paramagnetic behavior is observed for the lowest fluence. Annealing at 1073 K induces the aggregation of the implanted nickel and enhances the magnetization in all samples. The associated anisotropic behavior indicates preferred orientations of the nickel aggregates in the rutile lattice consistent with Rutherford backscattering spectrometry - channelling results. Electrical conductivity displays anisotropic behavior but no magnetoresistive effects were detected.
KW - Magnetic aggregate
KW - Nickel nanoparticle
KW - Titanium dioxide
U2 - 10.1016/j.jmmm.2013.03.032
DO - 10.1016/j.jmmm.2013.03.032
M3 - Article
VL - 340
SP - 102
EP - 108
JO - Journal Of Magnetism And Magnetic Materials
JF - Journal Of Magnetism And Magnetic Materials
SN - 0304-8853
ER -