Formation of oriented nickel aggregates in rutile single crystals by Ni implantation

M. M. Cruz, R. C. da Silva, J. V. Pinto, R. P. Borges, N. Franco, A. Casaca, E. Alves, M. Godinho

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)102-108
Number of pages7
JournalJournal Of Magnetism And Magnetic Materials
Volume340
DOIs
Publication statusPublished - Aug 2013

Fingerprint

Nickel
rutile
implantation
Single crystals
nickel
fluence
single crystals
Rutherford backscattering spectroscopy
Spectrometry
Magnetization
Magnetic properties
Electric properties
Agglomeration
Annealing
Crystalline materials
backscattering
Crystals
electrical properties
magnetic properties
magnetization

Keywords

  • Magnetic aggregate
  • Nickel nanoparticle
  • Titanium dioxide

Cite this

Cruz, M. M. ; Silva, R. C. da ; Pinto, J. V. ; Borges, R. P. ; Franco, N. ; Casaca, A. ; Alves, E. ; Godinho, M. / Formation of oriented nickel aggregates in rutile single crystals by Ni implantation. In: Journal Of Magnetism And Magnetic Materials. 2013 ; Vol. 340. pp. 102-108.
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title = "Formation of oriented nickel aggregates in rutile single crystals by Ni implantation",
abstract = "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.",
keywords = "Magnetic aggregate, Nickel nanoparticle, Titanium dioxide",
author = "Cruz, {M. M.} and Silva, {R. C. da} and Pinto, {J. V.} and Borges, {R. P.} and N. Franco and A. Casaca and E. Alves and M. Godinho",
note = "This work was partially supported by the Portuguese foundation FCT by a Ph.D. Grant (BD/8907/2002) to J.V. Pinto.",
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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 journalArticle

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

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JO - Journal Of Magnetism And Magnetic Materials

JF - Journal Of Magnetism And Magnetic Materials

SN - 0304-8853

ER -