Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films
A set of single layered nanostructured Ni films of thickness, t = 25 nm, 50 nm, 75 nm and 100 nm have been deposited using electron beam gun evaporation technique at 473 K under high vacuum condition. From the grazing incidence X-ray diffraction (GIXRD) studies, NiO phase formation has been noted. G...
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| Format: | Article |
| Language: | English |
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Sumy State University
2011-01-01
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| Series: | Журнал нано- та електронної фізики |
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| Online Access: | http://jnep.sumdu.edu.ua/download/numbers/2011/4/articles/jnep_2011_V3_N4_043-054.pdf |
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| author | P.J. Sadashivaiah T. Sankarappa T. Sujatha P. Saravanan Santoshkumar M. Prashantkumar G.B. Devidas B. Vijayakumar N. Nagaraja N. Sharanabasava |
| author_facet | P.J. Sadashivaiah T. Sankarappa T. Sujatha P. Saravanan Santoshkumar M. Prashantkumar G.B. Devidas B. Vijayakumar N. Nagaraja N. Sharanabasava |
| author_sort | P.J. Sadashivaiah |
| collection | DOAJ |
| description | A set of single layered nanostructured Ni films of thickness, t = 25 nm, 50 nm, 75 nm and 100 nm have been deposited using electron beam gun evaporation technique at 473 K under high vacuum condition. From the grazing incidence X-ray diffraction (GIXRD) studies, NiO phase formation has been noted. Grain sizes of the films were determined. The microstructure was examined by scanning electron microscope (SEM) studies. Average surface roughness was determined by atomic force microscope (AFM). The room temperature magnetization has been measured using the vibrating sample magnetometer (VSM). The coercive field was observed to be increasing with increasing t and became maximum for t = 75 nm and decreases for further increase in t. The behavior of coercive field with t indicated softness of the films. Low temperature electrical conductivity in the range from 5 K to 300 K has been measured. Temperature dependence of electrical conductivity showed semiconducting behavior. At temperatures above θD/2 (θD is the Debye temperature), the conductivity behavior has been understood in the light of Mott’s small polaron hopping model and activation energies were determined. An attempt has been made to understand conductivity variation below θD/2 using variable range hopping models due to Mott and Greaves. |
| format | Article |
| id | doaj-art-e5719b51a21443269308d40c0a8b2d23 |
| institution | Kabale University |
| issn | 2077-6772 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Sumy State University |
| record_format | Article |
| series | Журнал нано- та електронної фізики |
| spelling | doaj-art-e5719b51a21443269308d40c0a8b2d232025-08-20T03:25:02ZengSumy State UniversityЖурнал нано- та електронної фізики2077-67722011-01-01344354Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni FilmsP.J. SadashivaiahT. SankarappaT. SujathaP. SaravananSantoshkumarM. PrashantkumarG.B. DevidasB. VijayakumarN. NagarajaN. SharanabasavaA set of single layered nanostructured Ni films of thickness, t = 25 nm, 50 nm, 75 nm and 100 nm have been deposited using electron beam gun evaporation technique at 473 K under high vacuum condition. From the grazing incidence X-ray diffraction (GIXRD) studies, NiO phase formation has been noted. Grain sizes of the films were determined. The microstructure was examined by scanning electron microscope (SEM) studies. Average surface roughness was determined by atomic force microscope (AFM). The room temperature magnetization has been measured using the vibrating sample magnetometer (VSM). The coercive field was observed to be increasing with increasing t and became maximum for t = 75 nm and decreases for further increase in t. The behavior of coercive field with t indicated softness of the films. Low temperature electrical conductivity in the range from 5 K to 300 K has been measured. Temperature dependence of electrical conductivity showed semiconducting behavior. At temperatures above θD/2 (θD is the Debye temperature), the conductivity behavior has been understood in the light of Mott’s small polaron hopping model and activation energies were determined. An attempt has been made to understand conductivity variation below θD/2 using variable range hopping models due to Mott and Greaves.http://jnep.sumdu.edu.ua/download/numbers/2011/4/articles/jnep_2011_V3_N4_043-054.pdfThin filmsSurface roughnessMagnetizationCoercive fieldConductivity. |
| spellingShingle | P.J. Sadashivaiah T. Sankarappa T. Sujatha P. Saravanan Santoshkumar M. Prashantkumar G.B. Devidas B. Vijayakumar N. Nagaraja N. Sharanabasava Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films Журнал нано- та електронної фізики Thin films Surface roughness Magnetization Coercive field Conductivity. |
| title | Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films |
| title_full | Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films |
| title_fullStr | Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films |
| title_full_unstemmed | Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films |
| title_short | Magnetic and Low Temperature Conductivity Studies in Oxidized Nano Ni Films |
| title_sort | magnetic and low temperature conductivity studies in oxidized nano ni films |
| topic | Thin films Surface roughness Magnetization Coercive field Conductivity. |
| url | http://jnep.sumdu.edu.ua/download/numbers/2011/4/articles/jnep_2011_V3_N4_043-054.pdf |
| work_keys_str_mv | AT pjsadashivaiah magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT tsankarappa magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT tsujatha magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT psaravanan magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT santoshkumar magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT mprashantkumar magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT gbdevidas magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT bvijayakumar magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT nnagaraja magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms AT nsharanabasava magneticandlowtemperatureconductivitystudiesinoxidizednanonifilms |