Magnetic and magnetotransport properties in Co5Cu95 melt-spun alloys

R. H. Yu; X. X. Zhang; J. Tejada; M. Knobel; P. Tiberto; P. Allia

doi:10.1007/BF01320844

Magnetic and magnetotransport properties in Co₅Cu₉₅ melt-spun alloys

R. H. Yu^*, X. X. Zhang, J. Tejada, M. Knobel, P. Tiberto, P. Allia

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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 temperature T_A=350°C, the electron hybridization and super-paramagnetic behaviors of fine Co particles may be responsible for the low value of MR change.

Original language	English (US)
Pages (from-to)	447-451
Number of pages	5
Journal	Zeitschrift für Physik B Condensed Matter
Volume	98
Issue number	4
DOIs	https://doi.org/10.1007/BF01320844
State	Published - Dec 1995
Externally published	Yes

Keywords

72.15.G
75.60.E
78.70.D,E
83.70.F

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1007/BF01320844

Cite this

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title = "Magnetic and magnetotransport properties in Co5Cu95 melt-spun alloys",

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 temperature TA=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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AU - Yu, R. H.

AU - Zhang, X. X.

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AU - Knobel, M.

AU - Tiberto, P.

AU - Allia, P.

PY - 1995/12

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N2 - 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 temperature TA=350°C, the electron hybridization and super-paramagnetic behaviors of fine Co particles may be responsible for the low value of MR change.

AB - 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 temperature TA=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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