Magnetic properties of nanosize nickel particles produced in silica glasses by ion-implantation and subsequent annealing

Tetsuhiko Isobe, Robert A. Weeks, Raymond A. Zuhr

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

When Ni+ ions are implanted into silica glasses at a dose of 6 × 1016 cm-2 at 160 keV and 3 μA cm-2, nanosize Ni particles (6.5 ± 1.5nm) of spherical shape are produced in the implanted layer, as confirmed by transmission electron microscopy (TEM), electron diffractometry and X-ray photoelectron spectroscopy. The relative intensity of ferromagnetic resonance (FMR) absorption at 298 K increases by a factor of ∼ 12 after annealing in 4%H2 + 96%Ar for 4 h, although the Ni particle size observed by TEM does not change during this treatment. The mean Ni particle size, obtained from the temperature dependence of FMR intensity, increases from ∼4.5 nm to ∼5.5 nm by annealing. Magnetocrystalline anisotropy is observed in the FMR spectrum, measured at 133 K, of the annealed sample. The increase in FMR intensity by annealing is, therefore, attributed to an increase in the crystallinity of the Ni particles.

Original languageEnglish
Pages (from-to)469-472
Number of pages4
JournalSolid State Communications
Volume105
Issue number7
Publication statusPublished - 1998 Feb

Fingerprint

Ferromagnetic resonance
silica glass
ferromagnetic resonance
Fused silica
Nickel
Ion implantation
ion implantation
Magnetic properties
nickel
Annealing
magnetic properties
annealing
Particle size
Transmission electron microscopy
Magnetocrystalline anisotropy
transmission electron microscopy
crystallinity
X ray photoelectron spectroscopy
photoelectron spectroscopy
Ions

Keywords

  • A. Nanostructures, metals
  • B. Nanofabrications
  • C. Scanning and transmission electron microscopy
  • E. Photoelectron spectroscopies

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Magnetic properties of nanosize nickel particles produced in silica glasses by ion-implantation and subsequent annealing. / Isobe, Tetsuhiko; Weeks, Robert A.; Zuhr, Raymond A.

In: Solid State Communications, Vol. 105, No. 7, 02.1998, p. 469-472.

Research output: Contribution to journalArticle

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AU - Weeks, Robert A.

AU - Zuhr, Raymond A.

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N2 - When Ni+ ions are implanted into silica glasses at a dose of 6 × 1016 cm-2 at 160 keV and 3 μA cm-2, nanosize Ni particles (6.5 ± 1.5nm) of spherical shape are produced in the implanted layer, as confirmed by transmission electron microscopy (TEM), electron diffractometry and X-ray photoelectron spectroscopy. The relative intensity of ferromagnetic resonance (FMR) absorption at 298 K increases by a factor of ∼ 12 after annealing in 4%H2 + 96%Ar for 4 h, although the Ni particle size observed by TEM does not change during this treatment. The mean Ni particle size, obtained from the temperature dependence of FMR intensity, increases from ∼4.5 nm to ∼5.5 nm by annealing. Magnetocrystalline anisotropy is observed in the FMR spectrum, measured at 133 K, of the annealed sample. The increase in FMR intensity by annealing is, therefore, attributed to an increase in the crystallinity of the Ni particles.

AB - When Ni+ ions are implanted into silica glasses at a dose of 6 × 1016 cm-2 at 160 keV and 3 μA cm-2, nanosize Ni particles (6.5 ± 1.5nm) of spherical shape are produced in the implanted layer, as confirmed by transmission electron microscopy (TEM), electron diffractometry and X-ray photoelectron spectroscopy. The relative intensity of ferromagnetic resonance (FMR) absorption at 298 K increases by a factor of ∼ 12 after annealing in 4%H2 + 96%Ar for 4 h, although the Ni particle size observed by TEM does not change during this treatment. The mean Ni particle size, obtained from the temperature dependence of FMR intensity, increases from ∼4.5 nm to ∼5.5 nm by annealing. Magnetocrystalline anisotropy is observed in the FMR spectrum, measured at 133 K, of the annealed sample. The increase in FMR intensity by annealing is, therefore, attributed to an increase in the crystallinity of the Ni particles.

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