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Intra-cluster exchange-coupled high-performance permanent magnets

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Bibliographic Details
Title: Intra-cluster exchange-coupled high-performance permanent magnets
Authors: Rui, X.1,2 repreter@hotmail.com, Shield, J.E.1,2, Sun, Z.2,3, Skomski, R.2,3, Xu, Y.2,3, Sellmyer, D.J.2,3, Kramer, M.J.4, Wu, Y.Q.4
Source: Journal of Magnetism & Magnetic Materials. Nov2008, Vol. 320 Issue 21, p2576-2583. 8p.
Subjects: Condensation, Heat treatment of metals, Simulation methods & models, Solid rare gases
Abstract: Abstract: Inert gas condensation has been used to produce Fe-rich Fe–Pt clusters imbedded in C or SiO2. Compositions of the clusters ranged from the single-phase Fe3Pt phase field to the single-phase FePt phase field, and included compositions in the two-phase Fe3Pt+FePt phase field. The as-formed clusters formed in the A1 fcc structure for all compositions, and after proper heat treatment transformed to the Fe3Pt and/or FePt phases, depending on composition. Because the clusters were well isolated, the scale of the phases was limited by the cluster size. This intracluster structuring on such a fine scale ensured that the soft Fe3Pt and hard FePt phases were fully magnetically exchange-coupled with each other, which allowed greater soft phase fractions comparing with previous work. Energy products of the two-phase clusters with 50% Fe3Pt exceeded 25MGOe, compared to 11.8MGOe for the single-phase FePt clusters. Micromagnetic simulations revealed remarkable similarities with the experimental results with respect to the relationship between both coercivity and energy product as a function of cluster composition. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Inert gas condensation has been used to produce Fe-rich Fe–Pt clusters imbedded in C or SiO2. Compositions of the clusters ranged from the single-phase Fe3Pt phase field to the single-phase FePt phase field, and included compositions in the two-phase Fe3Pt+FePt phase field. The as-formed clusters formed in the A1 fcc structure for all compositions, and after proper heat treatment transformed to the Fe3Pt and/or FePt phases, depending on composition. Because the clusters were well isolated, the scale of the phases was limited by the cluster size. This intracluster structuring on such a fine scale ensured that the soft Fe3Pt and hard FePt phases were fully magnetically exchange-coupled with each other, which allowed greater soft phase fractions comparing with previous work. Energy products of the two-phase clusters with 50% Fe3Pt exceeded 25MGOe, compared to 11.8MGOe for the single-phase FePt clusters. Micromagnetic simulations revealed remarkable similarities with the experimental results with respect to the relationship between both coercivity and energy product as a function of cluster composition. [Copyright &y& Elsevier]
ISSN:03048853
DOI:10.1016/j.jmmm.2008.03.042