Size and shape effect on the canted antiferromagnetism in alpha-Fe2O3 particles

Authors
Fiorani, D Testa, AM Suber, L Angiolini, M Montone, A Polichetti, M
Citation
D. Fiorani et al., Size and shape effect on the canted antiferromagnetism in alpha-Fe2O3 particles, NANOSTR MAT, 12(5-8), 1999, pp. 939-942
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
NANOSTRUCTURED MATERIALS
ISSN journal
09659773 → ACNP
Volume
12
Issue
5-8
Year of publication
1999
Part
B
Pages
939 - 942
Database
ISI
SICI code
0965-9773(199907)12:5-8<939:SASEOT>2.0.ZU;2-0
Abstract
The effect of thermal treatments on both the Morin transition and the spin flop field (H-sf) of alpha-Fe2O3 acicular particles (major axis:( 350 +/- 5 0) nm; minor axis: ( 85 +/- 15) nm.) has been investigated by means of magn etization vs temperature-magnetic field measurements. Both the Morin transi tion and the spin flop process have been observed only after an annealing t reatment at 500 degrees C. Due to the finite size effect, the values of the Morin temperature and spin-flop field are significantly below the bulk val ue.