Random magnetocrystalline anisotropy in two-phase nanocrystalline systems

被引:252
作者
Suzuki, K [1 ]
Cadogan, JM [1 ]
机构
[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
来源
PHYSICAL REVIEW B | 1998年 / 58卷 / 05期
关键词
D O I
10.1103/PhysRevB.58.2730
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In order to clarify the effect of the exchange stiffness in the intergranular phase on the exchange correlation length (L-ex) and the random magnetocrystalline anisotropy ([K-1]) of two-phase nanocrystalline soft magnetic materials, the hyperfine fields (Fe-57), coercivity and remanence to saturation ratio of nanocrystalline Fe91Zr7B2 have been studied in the temperature range from 77 to 473 K. We observe that the coercivity of the nanocrystalline Fe91Zr7B2 in the temperature range near the Curie temperature of the intergranular amorphous phase (T-C(am)) varies as approximately the -6th power of the mean hyperfine field of the intergranular phase. This indicates that L-ex near T similar to T-C(am) is mostly governed by the exchange stiffness of the intergranular amorphous phase and [K-1] of the Fe-Zr-B sample should vary as the -3rd 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 L-ex. [S0163-1829(98)03629-7].
引用
收藏
页码:2730 / 2739
页数:10
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