Giant magnetoresistance in heterogeneous Cu–Co and Ag–Co alloy films (invited)

Berkowitz, A. E.; Mitchell, Joe; Carey, M. J.; Young, A. P.; Rao, D. Bhogeswara; Starr, Anthony F.; Zhang, S.; Spada, F. E.; Parker, F. T.; Hütten, Andreas; Thomas, G.

doi:10.1063/1.353767

Cited by 124 publications

(42 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This also suggests a change in the size and interaction effects of Co grains in the Au matrix with a wide distribution range. These results are consistent with the results of the low temperature magnetizations of Co-Cu [30] and Co-Ag [34] films. It is possible that the small cobalt grains present in Co-Au films deposited at the current density of 5 mA/cm 2 contributed to the larger MR values for these films [44].…”

Section: Composition Dependence Of Saturation Magnetizationsupporting

confidence: 82%

“…It seems that the Co-Au alloys electrodeposited at higher current densities either formed smaller grain sizes or formed solid solution. Similar results have been reported for other ferromagnetic films as well [45], [34]. The saturation magnetization of Co-Au alloys further decreased with the increase of annealing temperature due to the decrease in Co grain size, increase in Au grain size, and the change in the separation between the Co grains.…”

Section: B Composition Dependence Of Magnetoresistance Ratiosupporting

confidence: 75%

“…The blocking temperature was obtained from the zero-field-cooled (ZFC) curves measured by radio frequency-Superconducting Quantum Interface Device (rf-SQUID) meter. This measurement is extremely sensitive to grain interactions and provides a good technique for investigating the energy barrier distribution [34].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetotransport Properties of Co-Au Granular Alloys

Rizal¹,

Ueda²,

Pokharel³

2011

IJAPM

View full text Add to dashboard Cite

Abstract-A series of Cox-Au1-x granular alloys was grown using pulsed-current electrodeposition on polyimide substrates. The relationship between the giant magnetoresistance effect, saturation magnetization, and grain size was examined as the deposition current density and annealing temperatures were changed. A maximum magnetoresistance (MR) ratio of 4.5 % was obtained. The magnetization and ferromagnetic grain size of the as-deposited and annealed alloy films were examined against the deposition current density. The saturation magnetization decreased as the composition of Au was increased for both the alloys deposited at the current densities of 1 and 5 mA/cm2. The total magnetic moment further decreased on annealing. The grain size is found to be highly influenced by both the deposition current density and temperature. A low temperature magnetization measurement suggested that the ferromagnetic grain size decreases with increase in current densities. For the annealed samples, the ferromagnetic grain sizes were found to be dispersed in the Au matrix with different diameters. The decrease in magnetic moments with annealing is correlated with the grain size of the Co and its distribution in the gold matrix. The MR ratio increased with the increase in the deposition current density as a result of the formation of smaller grain size at higher deposition current densities.

show abstract

Section: Composition Dependence Of Saturation Magnetizationsupporting

confidence: 82%

Section: B Composition Dependence Of Magnetoresistance Ratiosupporting

confidence: 75%

See 1 more Smart Citation

Magnetotransport Properties of Co-Au Granular Alloys

Rizal¹,

Ueda²,

Pokharel³

2011

IJAPM

View full text Add to dashboard Cite

show abstract

“…These granular or inhomogeneous materials typically formed by immiscible elements (Co, Fe, Ni)-(Cu, Pt, Au, Ag) attracted considerable attention since the beginning of 90s [77,78]. The main interest in granular materials is related to GMR, previously discovered in magnetic multilayered films [79].…”

Section: Glass-coated Microwires With Granular Structurementioning

confidence: 99%

“…Typical ∆R/R(H) dependence measured in as-prepared Co 20 Cu 80 microwires is shown in Figure 18. The origin of the GMR effect in granular materials has been attributed to spin-dependent scattering of conduction electrons within the magnetic granules, as well as at the interfaces between magnetic and nonmagnetic regions [77,78]. These granular inhomogeneous solids can be prepared by different techniques including mechanical alloying and rapid quenching techniques [21,22,80].…”

Section: Granular Co-cu Microwiresmentioning

confidence: 99%

Correlation of Crystalline Structure with Magnetic and Transport Properties of Glass-Coated Microwires

et al. 2017

View full text Add to dashboard Cite

Abstract:We overviewed the correlation between the structure, magnetic and transport properties of magnetic microwires prepared by the Taylor-Ulitovsky method involving rapid quenching from the melt and drawing of the composite (metallic core, glass coated) wire. We showed that this method can be useful for the preparation of different families of magnetic microwires: soft magnetic microwires displaying Giant magnetoimpedance (GMI) effect, semi-hard magnetic microwires, microwires with granular structure exhibiting Giant Magnetoresistance (GMR) effect and Heusler-type microwires. Magnetic and transport properties of magnetic microwires depend on the chemical composition of metallic nucleus and on the structural features (grain size, precipitating phases) of prepared microwires. In all families of crystalline microwires, their structure, magnetic and transport properties are affected by internal stresses induced by the glass coating, depending on the quenching rate. Therefore, properties of glass-coated microwires are considerably different from conventional bulk crystalline alloys.

show abstract

Structural State of Mechanically Alloyed Cu–Co Compound with a Considerable Magnetoresistance Effect

Уймин

Yermakov

Serikov

et al. 1998

phys. stat. sol. (a)

View full text Add to dashboard Cite

The structural state of the Cu80Co20 compound after mechanical alloying and a subsequent thermal treatment has been studied by NMR spectroscopy and X‐ray diffraction as well as measurements of magnetic and magnetoresistive properties. The analysis of the data obtained suggests the presence of ultradispersed cobalt particles in the copper matrix. A partial dissolving of cobalt in copper is likely to take place in defect regions. Such a structure is responsible for superparamagnetism of the Cu80Co20 compound at kT > 150 K and for a considerable GMR effect (12% at T = 77 K). The shifting of X‐ray peaks of the copper matrix can be related to a coherent conjugation of Cu and Co constituents.

show abstract

Giant magnetoresistance in heterogeneous Cu–Co and Ag–Co alloy films (invited)

Cited by 124 publications

References 14 publications

Magnetotransport Properties of Co-Au Granular Alloys

Magnetotransport Properties of Co-Au Granular Alloys

Correlation of Crystalline Structure with Magnetic and Transport Properties of Glass-Coated Microwires

Structural State of Mechanically Alloyed Cu–Co Compound with a Considerable Magnetoresistance Effect

Contact Info

Product

Resources

About