Direct evidence of phase separation in as-deposited Fe(Co)-Ag films with giant magnetoresistance

Wei, Hong; Tsoukatos, A.; Hadjipanayis, G. C.; Li, Z. G.; Liu, Jingyue

doi:10.1103/physrevb.49.1524

Cited by 38 publications

(14 citation statements)

References 17 publications

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“…3, the peak position of Ag ͑111͒ shifts to the higher angle with x for all sputtering conditions, P Ar and V B , which is consistent with previous reports. 4,13,14 This must be associated with the partial substitution of Ag atoms by smaller Co atoms, or with the internal stress at the grain boundaries arising from the lattice mismatch between the Ag ͑111͒ and Co ͑111͒ planes. The lattice spacing for the pure Ag film, which is obtained by the extrapolation to xϭ0, is strongly influenced by the sputtering condition.…”

Section: A Film Structurementioning

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: A Film Structurementioning

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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“…[3][4][5][6][7][8][9] It was found that the electrical resistance of these materials significantly changes upon the application of external magnetic field, which is high for the random alignment of the magnetic cluster moments, and it decreases substantially when the individual moments are aligned parallel to the external magnetic field. The present understanding of the GMR effect is based on electron spindependent scattering in the magnetic clusters as well as at the interfaces between the magnetic and nonmagnetic entities, 10,11 and the interfacial spin-dependent scattering plays a dominant role.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the magnetic and transport properties of Co15Cu85 magnetic granular alloys

Zhu

Zhang

et al. 1998

Journal of Applied Physics

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Microstructural evolution and giant magnetoresistance in melt spun and annealed Cu 85 (FeCo) 15 alloyThe temperature dependence of magnetic and transport properties of annealed Co 15 Cu 85 alloys has been studied from 2 to 300 K. It was found that the magnetic property and resistivity significantly change with the temperature. Based on the two-current resistance model, we have calculated the electron spin-mixing parameter Q(T), which explains the magnetoresistance change with the temperature for granular Co 15 Cu 85 alloys.

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“…The investigation involved two main groups of alloys: CoCux (where x = 2, 4, 8,16) and CoCu4 doped with Gd. The GdxCoyC4y alloys were designed with a Gd/Co ratio defined as 1/n (where n = 2 m and m = 0, 1, 2, 3, 4, 5, 6).…”

Section: Methodsmentioning

confidence: 99%

“…Many aspects of the magnetic origin of the magnetoresistance (MR) effect remain unclear. Using sputtering technique to produce thin films [8,9] or rapid solidification processing for the preparation of melt-spun ribbons [10,11] there are obtained ferromagnetic nano-inclusions in non-magnetic matrix and because it several authors proposed the superparamagnetism as the basic magnetic behavior instead of GMR in granular materials.…”

Section: Introductionmentioning

confidence: 99%