Giant magnetoresistance and its dependence on processing conditions in magnetic granular alloys

Wang, Jianqing; Price, Edward P.; Xiao, Gang

doi:10.1063/1.356775

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…The inverse relation has been observed during the annealing processes by several authors. [9][10][11] However, the fundamental question about the origin of spindependent scattering remains uncertain; the GMR is very sensitive to some preparation parameters, 12 and it is intimately related to the density as well as the size of the magnetic granules. 3 We obtained heterogeneous Co-Ag films having the various grain sizes by varying sputtering conditions.…”

Section: Introductionmentioning

confidence: 99%

Giant magnetoresistance and superparamagnetic grains in Co–Ag granular films

Honda

Nawate

Tanaka

et al. 1997

Journal of Applied Physics

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Co-Ag granular films having various Co grain sizes are prepared by rf sputtering under various sputtering conditions. The Co grain sizes are derived from the magnetization curves by dividing them into ferromagnetic and superparamagnetic components. As the Co content decreases, the radii of the superparamagnetic Co grains, r g , decrease and the distances between the Co grains, t g , increase. The magnetoresistance is proportional to the volume density of superparamagnetic grains or related to kr g 3 exp(Ϫt g /l) with kϭ3.8ϫ10 2 ⍀/cm 2 and lϭ20 Å, implying that the giant magnetoresistance is caused by the spin-dependent scattering in the inner part of the superparamagnetic Co grains as well as at the grain surfaces. Furthermore, it is found that the extraordinary Hall effect arises mainly from the side jump mechanism, and that significant perpendicular magnetic anisotropy appears in the Co composition range between 40 and 70 at %.

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Section: Introductionmentioning

confidence: 99%

Giant magnetoresistance and superparamagnetic grains in Co–Ag granular films

Honda

Nawate

Tanaka

et al. 1997

Journal of Applied Physics

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“…Similarly, the negative MR is due to the GMR effect which arises from the spin-dependent scattering/spin fluctuation. This scattering emerges from the interaction between conduction electrons and the magnetic scattering center [25,26,55,56].…”

Section: Electrical Transport Propertymentioning

confidence: 99%

Magnetic and electrical transport studies of polycrystalline Sr₁₋ _x Bi _x Fe₁₂O₁₉ (x = 0, 0.01, and 0.02)

Sahoo

Barik

Kuila

et al. 2022

J. Phys. D: Appl. Phys.

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Bismuth (Bi) substituted strontium hexaferrite, Sr1-xBixFe12O19; for x = 0, 0.01 and 0.02 are studied via powder neutron diffraction (ND), magnetization (M) studies, Mössbauer spectroscopy and electrical transport. ND results show an indication of increasing Fe2+ at 12k crystallographic sites (and is supported by Mössbauer results), with increasing Bi in the sample. It also suggests increase in strain due to Bi substitution for the polyhedral associated with 2a and 2b spin-up and 4f1 spin-down sites. Magnetization measurements in a wide temperature range (3 – 823 K), shows irreversibility in zero field cooled (ZFC) and field cooled (FC) data right below the Curie temperature, along with the Hopkinson peak in the ZFC data. Temperature dependence of saturation magnetization follows the Bloch relation but that of coercive field shows an unconventional behavior. The coercive field data is fitted using an equation devised by taking into consideration of all the three anisotropies. The critical exponents at the ferromagnetic-paramagnetic phase transition boundary are calculated using modified Arrott plots, are slightly overvalued as per mean-field theory. Temperature dependence of resistivity displays nearest-neighbor hopping conduction in all the three samples. The conductivity increases with increasing Bi in the sample, due to the increasing Fe2+ content, which facilitates the electron hopping between Fe-sites. The magnetoresistance measured at various sub-room temperatures for all the compounds shows the interplay of anisotropy magnetoresistance (AMR) and giant magnetoresistance (GMR). Low temperature data are dominated by GMR and gradual participation of AMR increases as room temperature is approached.

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“…This material is mainly produced by physical methods [6,7] i.e. sputtering, physical vapour deposition or molecular beam epitaxy.…”

Section: Introductionmentioning

confidence: 99%

Evolution of magnetic and structural properties from Ag nanolayers to several microns Co–Ag deposits prepared by electrodeposition

García-Torres

Gómez

Vallés

2009

Journal of Electroanalytical Chemistry

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Giant magnetoresistance and its dependence on processing conditions in magnetic granular alloys

Cited by 8 publications

References 10 publications

Giant magnetoresistance and superparamagnetic grains in Co–Ag granular films

Giant magnetoresistance and superparamagnetic grains in Co–Ag granular films

Magnetic and electrical transport studies of polycrystalline Sr₁₋ _x Bi _x Fe₁₂O₁₉ (x = 0, 0.01, and 0.02)

Evolution of magnetic and structural properties from Ag nanolayers to several microns Co–Ag deposits prepared by electrodeposition

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Giant magnetoresistance and its dependence on processing conditions in magnetic granular alloys

Cited by 8 publications

References 10 publications

Giant magnetoresistance and superparamagnetic grains in Co–Ag granular films

Giant magnetoresistance and superparamagnetic grains in Co–Ag granular films

Magnetic and electrical transport studies of polycrystalline Sr1− x Bi x Fe12O19 (x = 0, 0.01, and 0.02)

Evolution of magnetic and structural properties from Ag nanolayers to several microns Co–Ag deposits prepared by electrodeposition

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Magnetic and electrical transport studies of polycrystalline Sr₁₋ _x Bi _x Fe₁₂O₁₉ (x = 0, 0.01, and 0.02)