TY - JOUR
T1 - Magnetic properties of nanosize nickel particles produced in silica glasses by ion-implantation and subsequent annealing
AU - Isobe, Tetsuhiko
AU - Weeks, Robert A.
AU - Zuhr, Raymond A.
N1 - Funding Information:
Acknowledgements--The authors thank Dr Thomas P. Seward at Coming Inc. for donation of silica glasses, Prof. Kenji Sumiyama at Tohoku University for valuable discussion and Dr Seung Y. Park at Chonnam National University for helping with the preparation of TEM samples. This research was supported in part by Lockheed Martin Energy Research Corp. for the U.S. Department of Energy under contract number DE-AC05-96OR22464.
PY - 1998/2
Y1 - 1998/2
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.
KW - A. Nanostructures, metals
KW - B. Nanofabrications
KW - C. Scanning and transmission electron microscopy
KW - E. Photoelectron spectroscopies
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U2 - 10.1016/S0038-1098(97)10156-9
DO - 10.1016/S0038-1098(97)10156-9
M3 - Article
AN - SCOPUS:0031995053
VL - 105
SP - 469
EP - 472
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 7
ER -