Solubility of Co clusters in Co-implanted ZnO thin films by 200 MeV Ag15+ ions irradiation
- Solubility of Co clusters in Co-implanted ZnO thin films by 200 MeV Ag15+ ions irradiation
- Khan, M. Wasi; Kumar, Ravi; Khan, M. A. Majeed; Angadi, Basavaraj; Jung, Y. S; 최원국; Srivastava, J. P.
- Issue Date
- Semiconductor science and technology
- VOL 24, NO 9, 095011-1-095011-6
- We have investigated the structural, electrical resistivity, pink noise (1/f noise) and magnetic
properties of 200 MeV Ag15+ ions (fluence ∼1 × 1012 ions cm−2) irradiated Co-implanted
ZnO thin films. The ZnO films were grown on Al2O3 substrate by the PA-MBE technique and
80 keV Co ion implantation with 1 × 1016 ions cm−2 dose value. The structural studies of an
unirradiated film show the presence of Co clusters, which dissolve in the ZnO matrix on swift
heavy ion (SHI) irradiation. The temperature-dependent electrical resistivity plots of pristine
(unirradiated) and irradiated films demonstrated semiconducting nature. The resistivity data
were fitted in the Mott’s variable range hopping (VRH) model and the activation energies were
estimated. The magnitude of normalized noise SV /V2 increases with decrease in temperature
and estimated Hooge’s parameters have higher values as compared to other semiconductors.
We observe a clear magnetic hysteresis loop with coercivity ∼65 Oe for both the films at room
temperature, establishing the ferromagnetic nature. The correlation between the electrical
transport and magnetic properties in the present system formulates it to be a potential aspirant
for the spintronics-oriented devices.
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