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• W2048933075 abstract "The magnetoresistance (MR) and magnetization were studied at room temperature and down to 4.2 K for Ni81Cu19(3 nm)/Cu(dCu) multilayers with 0.5nm⩽dCu⩽3 nm and for a bulk Ni81Cu19 alloy, all produced by electrodeposition. For most of the multilayers, giant magnetoresistance (GMR) was observed with a maximum around 1–1.5 nm Cu-layer thicknesses. The room-temperature MR curves consisted of a rapidly varying low-field component up to about 1 kOe and a slowly varying high-field component persisting beyond 18 kOe. For Cu-layer thicknesses around the maximum GMR, the low-field component dominated whereas for dCu>1.5 nm, it became comparable to or smaller than the high-field component. For the bulk alloy, anisotropic magnetoresistance was observed. According to the room-temperature magnetization curves, both the bulk alloy and the multilayers exhibited ferromagnetic (FM) behaviour with technical saturation around 1–3 kOe. For the multilayers, the low-field MR curves with a small peak splitting were characteristic of uncoupled or weakly coupled magnetic layers. Magnetic measurements from 5 to 300 K indicated that besides an FM contribution, these multilayers also exhibit a superparamagnetic (SPM) component with blocking temperature around 220 K. From an analysis of the present results, the low-field MR component could be attributed to the FM domains with their magnetizations exhibiting a random in-plane distribution in the zero-field (demagnetized) state and the high-field MR component to a contribution due to SPM regions. All these considerations are supported by the complete saturation of the MR in a magnetic field of 4 kOe at T=4.2 K." @default.
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• W2048933075 date "2004-02-01" @default.
• W2048933075 modified "2023-09-27" @default.
• W2048933075 title "Origin of giant magnetoresistance contributions in electrodeposited Ni–Cu/Cu multilayers" @default.
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• W2048933075 doi "https://doi.org/10.1016/s0304-8853(03)00587-0" @default.
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