| Autor: |
Sawicki, M, Guziewicz, Elzbieta, Witkowski, Bartlomiej, Wachnicki, Lukasz, Klepka, Marcin, Luque, F. J., Arvanitis, D., Sobczak, Janusz W., Krawczyk, M, Jablonski, A, Stefanowicz, W., Sztenkiel, D, Lukasiewicz, M, Godlewski, M., Dietl, T, Proselkov, O, Kowalik, Iwona, Lisowski, W, Dluzewski, P, Wolska, Anna, Paszkowicz, Wojciech, Jakiela, R |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Physical review / B 88(8), 085204 (2013). doi:10.1103/PhysRevB.88.085204 |
| Popis: |
A series of (Zn,Co)O layers with Co contents x up to 40% grown by atomic layer deposition have been investigated. All structures deposited at 160∘C show magnetic properties specific to II-VI dilute magnetic semiconductors with localized spins S=3/2 coupled by strong but short-range antiferromagnetic interactions resulting in low-temperature spin-glass freezing for x=0.16 and 0.4. At higher growth temperature (200∘C) metallic Co nanocrystals precipitate in two locations giving rise to two different magnetic responses: (i) a superparamagnetic contribution coming from volume disperse nanocrystals; (ii) a ferromagneticlike behavior brought about by nanocrystals residing at the (Zn,Co)O/substrate interface. It is shown that the dipolar coupling within the interfacial two-dimensional dense dispersion of nanocrystals is responsible for the ferromagneticlike behavior. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
