Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)x(Al2O3)1−x films
Artykuł w czasopiśmie
MNiSW
35
Lista A
| Status: | |
| Autorzy: | Svito Ivan A., Fedotova Julia A., Milosavljević Momir, Żukowski Paweł, Kołtunowicz Tomasz, Saad Anis M., Kierczyński Konrad, Fedotov Aleksander K. |
| Rok wydania: | 2013 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Wolumen/Tom: | 615 |
| Strony: | 344 - 347 |
| Impact Factor: | 2,726 |
| Web of Science® Times Cited: | 0 |
| Scopus® Cytowania: | 39 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The present paper investigates conductivity σ for a wide temperature range of 2 K < T < 300 K in the nanocomposite (FeCoZr)x(Al2O3)1−x films (1–6 μm thicknesses, 0.30 < x < 1.00) which were sputtered on glass–ceramic substrates from the compound target in vacuum chamber filled with Ar (set 1 films) or Ar + O2 gas mixture (set 2 films). TEM and HRTEM images revealed that granular films of set 1 containing nanosized crystalline metallic bcc α-FeCo-based nanoparticles embedded in the amorphous Al2O3 matrix. In case of Ar + O atmosphere of deposited α-FeCo-based crystalline “cores” with stabilized sizes were covered with an amorphous FeCo-based oxide “shells”. The σ(T) dependences were found to be in agreement with this phase structure. They show transition of the set 1 films σ(T) curves with x from tunneling (hopping) behavior below the percolation threshold x < xC ≈ 0.46 to metallic one for x > xC. Moreover, as opposed to such behavior, for the set 2 films hopping mechanism of σ(T) was revealed far beyond xC due to the formation of semiconducting FeCo-based oxide “shells” separating electrically contacting FeCoZr cores. |
