Coercivity and squareness enhancement in ball-milled hard magnetic-antiferromagnetic composites
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Nogués, Josep (Universitat Autònoma de Barcelona. Departament de Física)
Suriñach, Santiago (Universitat Autònoma de Barcelona. Departament de Física)
Muñoz Domínguez, Juan Santiago (Universitat Autònoma de Barcelona. Departament de Física)
Baró, M. D. (Universitat Autònoma de Barcelona. Departament de Física)
Chappel, E. (Laboratoire National de Champs Magnétiques Intenses)
Dupont, F. (Laboratoire National de Champs Magnétiques Intenses)
Chouteau, G. (Laboratoire National de Champs Magnétiques Intenses)

Date:	2001
Abstract:	The room-temperature coercivity,HC, and squareness, MR/MS (remanence/saturation magnetizations), of permanent magnet,SmCo5powders have been enhanced by ball milling with antiferromagnetic NiO (with Néel temperature, TN=590 K). This enhancement is observed in the as-milled state. However, when the milling of SmCo5 is carried out with an antiferromagnet with TN below room temperature (e. g. , for CoO, TN=290 K), the coercivity enhancement is only observed at low temperatures after field cooling through TN. The ferromagnetic-antiferromagnetic exchange coupling induced either by local heating during milling(SmCo5+NiO) or field cooling (SmCo5+CoO) is shown to be the origin of the HC increase.
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Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Coercive force ; Milling ; Antiferromagnetism ; Permanent magnets ; Powders ; Remanence ; Saturation moments
Published in:	Applied physics letters, Vol. 79, Issue 8 (June 2001) , p. 1142-1144, ISSN 1077-3118

DOI: 10.1063/1.1392308

4 p, 295.3 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Research articles
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