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- W207149968 abstract "Ferromagnetic nanocomposites, or “exchange spring” magnets, possess a nanoscaled microstructure that allows intergrain #magnetic exchange forces to couple the constituent grains and alter the system’s effective magnetic anisotropies. While the effects of the anisotropy alterations ark dearly seen in macroscopic magnetic measurement, it is extremely difficult to determine the detailed effects of the system’s exchange coupling, such as the interphase exchange length, the inherent domain wall widths or the effective anisotropies of the system. Clarification of these materials parameters may be obtained from the “micromagnetic” phenomenological model, where the assumption of magnetic reversal initiating in the magnetically-soft regions of the exchange-spring maqet is explicitly included, This approach differs from that typically applied by other rekearchers’ and allows-’ p quantitative estimate of the effective anisotropies of an exchange spring system. Hysteresis loops measured on wellcharacterized nanocomposite alloys based on the composition Nd2FelJ3 + a-Fe at temperatures above the spin reorientation temperature were analyzed within the framework of the micromagnetic phenomenological model. Preliminary results indicate that the effective anisotropy constant in the material is intermediate to that of bulk a-Fe and bulk NdzFelJ3 and increases with decreasing temperature. These results strongly support the idea that magnetic reversal in nanocomposite systems initiates in the loweranistropy regions of the system, and that the soft-phase regions become exchangehardened by virtue of their proximity to the magnetically-hard regions. ’. J. Bauer, M. Seeger, A. Zern and H. Kronmiiller, “Nanocrystalline FeNdB permanent magnets with enhanced remanence”, J. Appl. Phys. 80 (3) (1996) 1667; D. Goll, M. Seeger and H. Krontniiiler, “Magnetic and microstructural properties of nanocrystalline exchange coupled PrFeB permanent magnets” J. Mugn. Mugn. Mater 185 (1) (1998) 49-60 Research performed under the auspices of the U.S. D.O.E., Division of Materials Sciences, Office of Basic Energy Sciences under contract No. DE-AC02-98CH10886." @default.
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- W207149968 date "2003-01-01" @default.
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- W207149968 title "ANISOTROPY DETERMINATIONS IN EXCHANGE-SPRING MAGNETS" @default.
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