Magnetic hardening induced by exchange coupling in mechanically milled antiferromagnetic - ferromagnetic composites

J. Sort, J. Nogues, X. Amils, S. Surinach, J. S. Munoz, M. D. Baro

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Mechanical milling has been used to synthesize ferromagnetic (FM, Co) - antiferromagnetic (AFM, NiO) composites. The coercivity, HC, and energy product, BHMax, of these composites can be enhanced at room temperature after appropriate heat treatments above the Neel temperature of the AFM, TN. Although the maximum HC is achieved for the (NiO)1:1(Co) weight ratio, BHMax is further enhanced for the (NiO)2:3(Co) ratio, where higher saturation magnetization is obtained due to the larger amount of FM. Exchange coupling, responsible for these effects, decreases as the temperature is increased and vanishes close to TN. The thermal stability of the coercivity enhancement remains rather insensitive to the somewhat broad distribution of blocking temperatures of this system.
Original languageEnglish
Pages (from-to)641-646
JournalMaterials Research Society Symposium - Proceedings
Volume581
Publication statusPublished - 1 Jan 2000

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