Random magnetocrystalline anisotropy in two-phase nanocrystalline systems

K. Suzuki, J. Cadogan

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In order to clarify the effect of the exchange stiffness in the intergranular phase on the exchange correlation length (Formula presented) and the random magnetocrystalline anisotropy (Formula presented) of two-phase nanocrystalline soft magnetic materials, the hyperfine fields (Formula presented) coercivity and remanence to saturation ratio of nanocrystalline (Formula presented) have been studied in the temperature range from 77 to 473 K. We observe that the coercivity of the nanocrystalline (Formula presented) in the temperature range near the Curie temperature of the intergranular amorphous phase (Formula presented) varies as approximately the (Formula presented) power of the mean hyperfine field of the intergranular phase. This indicates that (Formula presented) near (Formula presented) is mostly governed by the exchange stiffness of the intergranular amorphous phase and (Formula presented) of the Fe-Zr-B sample should vary as the (Formula presented) power of the exchange stiffness constant in the intergranular region. These results are explained well by our extended two-phase random anisotropy model in which two local exchange stiffness constants are considered for the spin-spin correlation within (Formula presented).

Original languageEnglish
Pages (from-to)2730-2739
Number of pages10
JournalPhysical Review B
Issue number5
Publication statusPublished - 1 Jan 1998
Externally publishedYes

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