Coercivity and squareness enhancement in ball-milled hard magnetic-antiferromagnetic composites

Citation
J. Sort et al., Coercivity and squareness enhancement in ball-milled hard magnetic-antiferromagnetic composites, APPL PHYS L, 79(8), 2001, pp. 1142-1144
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
8
Year of publication
2001
Pages
1142 - 1144
Database
ISI
SICI code
0003-6951(20010820)79:8<1142:CASEIB>2.0.ZU;2-I
Abstract
The room-temperature coercivity, H-C, and squareness, M-R/M-S (remanence/sa turation magnetizations), of permanent magnet, SmCo5 powders have been enha nced by ball milling with antiferromagnetic NiO (with Neel temperature, T-N =590 K). This enhancement is observed in the as-milled state. However, when the milling of SmCo5 is carried out with an antiferromagnet with T-N below room temperature (e.g., for CoO, T-N=290 K), the coercivity enhancement is only observed at low temperatures after field cooling through T-N. The fer romagnetic-antiferromagnetic exchange coupling induced either by local heat ing during milling (SmCo5+NiO) or field cooling (SmCo5+CoO) is shown to be the origin of the H-C increase. (C) 2001 American Institute of Physics.