Magnetic and magnetotransport properties in Co5Cu95 melt-spun alloys |
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| Authors: | R. H. Yu X. X. Zhang J. Tejada M. Knobel P. Tiberto P. Allia |
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| Affiliation: | (1) Department de Fisica Fonamental, Facultat de Fisica, Universitat de Barcelona, E-08028 Barcelona, Spain;(2) IFGW, Universidade Estadual de Campinas (Unicamp), C.P. 6165, 13083-970 Campinas, S.P., Brazil;(3) Dipartimento di Fisica, Politecnico di Torino, Torino, Italy;(4) Consorzio INFM, Research Unit of Torino-Politecnico, Torino, Italy |
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| 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 temperatureTA=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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| Keywords: | 72.15.G 75.60.E 78.70.D,E 83.70.F |
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