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Thakur, P.,Kumar, R.,Cezar, J.C.,Brookes, N.B.,Sharma, A.,Arora, S.K.,Gautam, S.,Kumar, A.,Chae, K.H.,Shvets, I.V. North Holland 2011 Chemical physics letters Vol.501 No.4
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al<SUB>2</SUB>O<SUB>3</SUB> (001) matrix prepared by ion-implantation (Ni:5x10<SUP>16</SUP>-2x10<SUP>17</SUP>ionscm<SUP>-2</SUP>) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size ~8-19nm along with the other NiO<SUB>x</SUB> phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO<SUB>x</SUB> phases. The ferromagnetism at 10K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L<SUB>3,2</SUB> XMCD measurements.
Effect of proton irradiation on electrical properties of a-As<sub>2</sub>S<sub>3</sub>
Gautam, S.,Thakur, A.,Shukla, D.K.,Shin, H.J.,Chae, K.H.,Singh, K.P.,Goyal, N. North-Holland 2011 Journal of non-crystalline solids Vol.357 No.11
This paper reports the effect of proton irradiation on the electrical properties of a-As<SUB>2</SUB>S<SUB>3</SUB> in the temperature range of 323-418K and frequency range 0.1-100kHz. The variation of transport property is studied with proton irradiation dose (1x10<SUP>13</SUP>ions/cm<SUP>2</SUP> and 1x10<SUP>15</SUP>ions/cm<SUP>2</SUP>). It has been observed that proton irradiation changes the dc conductivity (σ<SUB>dc</SUB>), dc activation energy (ΔE<SUB>dc</SUB>) and ac conductivity (σ<SUB>ac</SUB>(ω)). The σ<SUB>dc</SUB> and σ<SUB>ac</SUB>(ω) increases with dose of proton irradiation. The value of frequency exponent (s) decreases with the temperature and irradiation dose. These results are explained in terms of change in density of defect states in these glasses.