Strong unidirectional anisotropy in mechanically alloyed spinel ferrites

Authors
Shi, Y Ding, J
Citation
Y. Shi et J. Ding, Strong unidirectional anisotropy in mechanically alloyed spinel ferrites, J APPL PHYS, 90(8), 2001, pp. 4078-4084
Citations number
25
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
00218979 → ACNP
Volume
90
Issue
8
Year of publication
2001
Pages
4078 - 4084
Database
ISI
SICI code
0021-8979(20011015)90:8<4078:SUAIMA>2.0.ZU;2-V
Abstract
Cluster glass and relatively high coercivity at low temperatures were found in disordered ultrafine nickel ferrite powders. High-energy mechanical mil ling of spinel NiFe2O4 led to formation of a wustitelike structure. Our inv estigation suggested that ferrimagnetic clusters formed in an antiferromagn etic matrix. The strong ferri/antiferromagnetic exchange coupling resulted in a strong unidirectional anisotropy and a coercivity of over 10 kOe at 4. 2 K. (C) 2001 American Institute of Physics.