Enhancement of the Curie temperature of the amorphous intergranular phase in Sm-Fe-Ga-C nanocomposite permanent magnetic materials

Authors: Cheng Z-h.1; Zhang J-x.2; Kronmüller H.2; Dunlap R.A.3; Shen B-g.1

Source: Journal of Physics: Condensed Matter, Volume 15, Number 2, 2003 , pp. 267-274(8)

Publisher: Institute of Physics Publishing

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Abstract:

The magnetic properties of the nanocomposite permanent magnetic materials Sm-Fe-Ga-C have been investigated. As-quenched Sm2Fe18Ga2C2.2 samples prepared with a substrate velocity vs 18.5 and 19.5 m s-1 contain some amorphous intergranular phase, together with Sm2Fe15Ga2C2.2 (Th2Zn17-type structure) and -Fe. On the basis of the compositional dependence of the Curie temperature in Sm2 Fe15+x Ga2C2.2amorphous ribbons, an enhancement of the Curie temperature of the amorphous intergranular phase (aip) was found in nanocomposite alloys with respect to amorphous ribbons of the same composition.57Fe magnetic hyperfine field distributions for the amorphous intergranular amorphous phase are narrower than those for the amorphous ribbon. No difference was found in average hyperfine field, and hence in Fe magnetic moment, within the experimental error. We also excluded the effect of compositional difference on Curie temperature. The enhancement of the Curie temperature is thus concluded to originate from the penetration of the molecular field of crystallized magnetic phases into the amorphous intergranular region. Finally, a theoretical model was proposed to explain the mechanism of 'extra' enhancement of the Curie temperature.

Language: English

Document Type: Miscellaneous

Affiliations: 1: State Key Laboratory of Magnetism, Institute of Physics and Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China 2: Max-Planck-Institut für Metallforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany 3: Department of Physics, Dalhousie University, Halifax, NS B3H 3J5, Canada

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