Giant magnetoresistance effect in grain-type alloy thin films

Maeda, Atsushi; Kume, Minoru; Oikawa, Satoru; Shimizu, Yutaka; Doi, M.

doi:10.1088/0953-8984/5/13/007

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…5). In our previous study, the best result in the MR characteristics has been obtained in 100 nm-thick Co19Ag81 film with a maximum MR ratio as high as 19.4% [11]. However, the intrinsic MR change of this sample has been no more than 1 n. Since the MR change, not the MR ratio, is directly correlated with output voltage, its increase for ultra-thin :films is an important knowledge for sensor device applications.…”

Section: Id Results and Discussionmentioning

confidence: 83%

“…This effect is believed to originate from interfacial spin-dependent scattering [2][3][4][5], since the multilayer materials have physical properties that are strongly influenced by interlayer diffusion. The GMR effect has also been found in some structures of granular materials comprising mutually insoluble magnetic and nonmagnetic metals andlor alloys [6][7][8][9][10][11][12][13][14]. Therefore, it does not exist only in multilayered structures.…”

Section: Infroductlonmentioning

confidence: 99%

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Origin of Giant Magnetoresistance in Granular Magnetic Systems

et al. 1994

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Granular Co-Ag films go through a steep demagnetization process when a permalloy layer is added to them, but slow saturation is maintained in the magnetoresistance (MR) curves. In addition, granular Fe-Ag films prepared under a magnetic field, in which strong magnetic anisotropy is induced, have MR characteristics that are isotropic. This disagreement between MR and magnetic characteristics indicates that ferromagnetic granules are not responsible for the giant MR (GMR) effect. The MR ratio of the granular Fe-Ag film considerably increases when the thickness of the film is less than 20 nm. For such ultra-thin films, the MR curves and the magnetization curves with slow saturation and no hysteresis have features that correspond well with each other. These results show that superpararnagnetism causes the GMR effect in granular systems.

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Section: Id Results and Discussionmentioning

confidence: 83%

Section: Infroductlonmentioning

confidence: 99%

Origin of Giant Magnetoresistance in Granular Magnetic Systems

et al. 1994

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Analysis of AgCo thin film alloys using PIXE and RBS

Šandrik

Grime

1996

Nuclear Instruments and Methods in Physics Research Section B:

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Annealing effects on the magnetoresistance characteristics of grain-type alloy thin films

Maeda¹,

Kume²,

Oikawa³

et al. 1993

J. Phys.: Condens. Matter

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SmcNral, magnetoresistance (m), and magnetic chaacteristics were studied on FeCwAg grain-type alloy thin films annealed under various conditionr. Internal diffusion and interfacial diffusion of the Ag a" in the femmaguetic FeCo grains passessed negative and positive contributions to obtaining a large MR ratio, respectively. The magnetic anisotropy field ( H i ) associated wilh the MU characteristics decreased in accordance with the decrease in resistivity as the annealing tempemme and/or annealing time inneased. This suggests that the Ruderman-Kiltel-Kasuya-yosida interaction between the ferroma&netic grains dominates the Hk in such systems.When two kinds of metal that are mutually insoluble are evaporated or sputtered at the same time, each metal is known to individually form fine grains in the prepared film [I]. Recently, it has been observed that a giant magnetoresistance ( G m ) effect is present in such 'grain-type alloy thin films' comprising magnetic and non-magnetic metals l2-71. These results demonstrated that the G m effect is not restricted to multilayered structures and they showed that additional oppoitunities exist for technological applications. However, the magnetic anisotropy field (H,) associated with the m characteristics, which is important in the application of MR head devices, was too large in such grain systems. From our studies

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Giant magnetoresistance effect in grain-type alloy thin films

Cited by 9 publications

References 18 publications

Origin of Giant Magnetoresistance in Granular Magnetic Systems

Origin of Giant Magnetoresistance in Granular Magnetic Systems

Analysis of AgCo thin film alloys using PIXE and RBS

Annealing effects on the magnetoresistance characteristics of grain-type alloy thin films

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