The control of cluster-glass transition temperature in spinel-type ZnFe2O4-delta thin film

Citation
Y. Yamamoto et al., The control of cluster-glass transition temperature in spinel-type ZnFe2O4-delta thin film, JPN J A P 2, 40(6A), 2001, pp. L545-L547
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
6A
Year of publication
2001
Pages
L545 - L547
Database
ISI
SICI code
0021-4922(20010601)40:6A<L545:TCOCTT>2.0.ZU;2-#
Abstract
The room-temperature cluster glass state has been realized in zinc ferrite (ZnFe2O4-delta) thin films using the pulsed-laser-deposition (PLD) method. When the deposition rate was slow about 7 Angstrom /min, the thin film show ed antiferromagnetism similar to the bulk zinc ferrite whose Neel temperatu re was about 20 K. However, by increasing the deposition rate, the magnetiz ation-temperature curve behaved the same as that of cluster glass, and hyst eresis between zero-field-cooled and field-cooled magnetization processes w as also observed. At higher than 30 Angstrom /min, the cluster glass transi tion temperature (T-G) reached approximately room temperature. There are tw o possibilities for the origin of high-T-G cluster glass: 1) spin frustrati on resulting from the competition of antiferromagnetic interaction between A-B and B-B site iron ions, and 2) random oxygen deficiency. These two fact ors induced the high-temperature cluster-glass state in zinc ferrite thin f ilms.