Giant magnetoresistance in granular CuFeNi alloys

Martins, Clarissa Silva; Rechenberg, H.; Missell, F.P.

doi:10.1063/1.367624

Cited by 17 publications

(11 citation statements)

References 8 publications

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“…It should be pointed out that Fe atoms have been found to exist in the bcc phase in an annealed 10Fe-10Ni-80Cu melt-spun ribbon as indicated in its Mössbauer spectrum. 16 Although the melt-spun ribbon has a slightly different composition than our microwires, the phase diagram alone could not explain why the two have different forms of Fe.…”

Section: ͓S0021-8979͑00͒57708-1͔mentioning

confidence: 74%

Magnetotransport and micro-x-ray absorption near-edge structure studies of glass-coated Fe–Ni–Cu microwires

Wang

Tang

Schilling

et al. 2000

Journal of Applied Physics

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Magnetotransport and micro-x-ray absorption near-edge structure (micro-XANES) studies of glass-coated 20Fe–20Ni–60Cu microwires have been carried out on both as-cast and heat-treated samples. The micro-XANES spectroscopy data were collected at the K edges of Cu, Ni, and Fe with the x-ray microprobe beamline at the Center for Advanced Microstructures and Devices. Comparison of the Fe K-edge spectra from the microwires to standard spectra reveals that the Fe atoms in the as-cast sample are in a face-centered cubic (fcc) configuration and they remain in the fcc phase throughout the annealing processes. Giant magnetoresistance (GMR) has been observed in the microwires and it reaches ∼6.5% at 300 K in a field of 9 T. The MR decreases to ∼2.5% as the annealing temperature increases to 500 °C. The loss of GMR upon annealing is attributed to the growth of Fe–Ni rich magnetic particles. Significant reduction in the number of extremely small particles is obtained after annealing at 500 °C, which shows MR characteristics that are different from the as-cast and 300 °C annealed microwires.

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Section: ͓S0021-8979͑00͒57708-1͔mentioning

confidence: 74%

Magnetotransport and micro-x-ray absorption near-edge structure studies of glass-coated Fe–Ni–Cu microwires

Wang

Tang

Schilling

et al. 2000

Journal of Applied Physics

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“…The ribbons were 5 mm wide, 60 mm thick, and several meters long. Literature reports good GMR properties for such ribbons after annealing at 4008C for 2 h Martins et al, 1998!. To determine the parameters influencing the evolution of the GMR, a structural analysis was made on ribbons in the as-spun condition and annealed at 3508C and at 4008C for the same duration. FIM samples were prepared in the form of sharp tips with a radius of curvature close to 50 nm.…”

Section: Sample Preparationmentioning

confidence: 99%

“…values were measured on CuFeNi melt spun ribbons~Chen et al, 1994ribbons~Chen et al, , 1996Martins et al, 1998;Martins & Missel, 1999;Baricco et al, 2004!. This GMR effect is attributed to the presence of fine scale magnetic precipitates embedded in a nonmagnetic matrix.…”

Section: Introductionmentioning

confidence: 99%

Nanometer Scale Tomographic Investigation of Fine Scale Precipitates in a CuFeNi Granular System by Three-Dimensional Field Ion Microscopy

et al. 2012

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The microstructure of Cu80Fe10Ni10 (at. %) granular ribbons was investigated by means of three-dimensional field ion microscopy (3D FIM). This ribbon is composed of magnetic precipitates embedded in a nonmagnetic matrix. The magnetic precipitates have a diameter smaller than 5 nm in the as-spun state and are coherent with the matrix. No accurate characterization of such a microstructure has been performed so far. A tomographic characterization of the microstructure of melt spun and annealed Cu80Fe10Ni10 ribbon was achieved with 3D FIM at the atomic scale. A precise determination of the size distribution, number density, and distance between the precipitates was carried out. The mean diameter for the precipitates is 4 nm in the as-spun state. After 2 h at 350°C, there is an increase of the size of the precipitates, while after 2 h at 400°C the mean diameter of the precipitates decreases. Those data were used as inputs in models that describe the magnetic and magnetoresistive properties of this alloy.

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“…Such spin dependent scattering is a well-known phenomenon in magnetic metals [6]. In multilayer films the magnetoresistance is explained on the basis of two currents model [16,17] in which the electrical current in the stack of layers is divided into two currents resulting from spin-up and spin-down electrons. These two types of electrons have different scattering probabilities at the interfaces and in the bulk of the layers.…”

Section: Mr = [(R H -Ro) / Ro ] X 100 = [(P H -P 0 ) / Po ] X 100mentioning

confidence: 99%

Giant Magnetoresistance in Electrodesposited Nanogranular Thin Films

Kashyap¹

2004

Physics and Technology of Thin Films

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In the present paper, an attempt has been made to briefly describe giant magnetoresistance (GMR) in electrodeposited nanogranular binary thin films with greater emphasis on the work carried out in the author's laboratory. High quality nanogranular thin films of Cu-Co system showing excellent metallic luster were galvanostatically electrodeposited in a single sulphate bath, under optimized processing parameters (i.e. deposition current density, bath temperature and pH). These parameters influence the composition and microstructure of the resulting films. Magnetoresistance measurements were carried out on both unannealed and annealed thin films deposited directly on n-Si or on conducting-glass/-AI 2 0 3 (used as second electrode). The rnicrostructural and magnetic measurements have suggested that an optimum distribution of size and separation of the magnetic particles can result in maximum GMR in such systems.

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Giant magnetoresistance in granular CuFeNi alloys

Cited by 17 publications

References 8 publications

Magnetotransport and micro-x-ray absorption near-edge structure studies of glass-coated Fe–Ni–Cu microwires

Magnetotransport and micro-x-ray absorption near-edge structure studies of glass-coated Fe–Ni–Cu microwires

Nanometer Scale Tomographic Investigation of Fine Scale Precipitates in a CuFeNi Granular System by Three-Dimensional Field Ion Microscopy

Giant Magnetoresistance in Electrodesposited Nanogranular Thin Films

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