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Magnetic and magnetotransport properties in Co5Cu95 melt-spun alloys

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Zeitschrift für Physik B Condensed Matter

Abstract

Giant magnetoresistance (GMR) has been observed in Co5Cu95 alloys fabricated by melt-spinning. The highest MR change of 28.0% occurs for Co5Cu95 after annealing at 450°C for 30 min. Based on the super-paramagnetic assumption, the average size of Co particles embedded in Cu matrix, ranging from 3.0 to 6.0 nm, has been determined by simulating the magnetization curves at 295 K which is higher than the blocking temperatures for the samples. Comparison with phenomenological theory for GMR indicates that the interfacial spin-dependent scattering is the dominant scattering mechanism underlying GMR origin in granular systems. Additionally, for the samples in as-quenched state or annealed at temperatureT A=350°C, the electron hybridization and super-paramagnetic behaviors of fine Co particles may be responsible for the low value of MR change.

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Authors and Affiliations

  1. Department de Fisica Fonamental, Facultat de Fisica, Universitat de Barcelona, E-08028, Barcelona, Spain

    R. H. Yu, X. X. Zhang & J. Tejada

  2. IFGW, Universidade Estadual de Campinas (Unicamp), C.P. 6165, 13083-970, Campinas, S.P., Brazil

    M. Knobel

  3. Dipartimento di Fisica, Politecnico di Torino, Torino, Italy

    P. Tiberto & P. Allia

  4. Consorzio INFM, Research Unit of Torino-Politecnico, Torino, Italy

    P. Tiberto & P. Allia

Authors
  1. R. H. Yu
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  2. X. X. Zhang
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  3. J. Tejada
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  4. M. Knobel
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  5. P. Tiberto
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  6. P. Allia
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Yu, R.H., Zhang, X.X., Tejada, J. et al. Magnetic and magnetotransport properties in Co5Cu95 melt-spun alloys. Z. Physik B - Condensed Matter 98, 447–451 (1995). https://doi.org/10.1007/BF01320844

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  • DOI: https://doi.org/10.1007/BF01320844

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