Papers by Keyword: Giant Magnetoresistance

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Authors: Pedro B. Tavares, Vitor S. Amaral, João P. Araújo, A. Lourenço, J. Bessa Sousa, Joaquim M. Vieira
Authors: M. Ohnuma, Kazuhiro Hono, Hidehiro Onodera, J.S. Pedersen, S. Mitani, H. Fujimori
Authors: Y.G. Wang
Abstract: The potential barrier at the metal/oxide junction in a specular spin valve structure with nano-oxide layers has been mapped by off-axis electron holography in a field emission gun transmission electron microscope. A potential jump of ~3V across the metal/oxide junction was detected. Presence of the potential barrier confirms formation of metal/insulator/metal structure, which contributes to confinement of conductance electrons with spin polarity characteristic in the key SV structure by the specular reflection of the spin-polarized electrons at the metal/oxide junction and leads to nearly double enhancement of magnetoresistance (MR) ratio from 8% to ~16%.
Authors: J.C. Cezar, M.C.L. Martins, D.Z. Cruz, Fábio C.S. da Silva, Marcelo Knobel, H. Tolentino
Authors: M.A. Milyaev, L.I. Naumova, V.V. Proglyado, T.P. Krinitsina, N.S. Bannikova, V.V. Ustinov
Abstract: The effect of Cr-buffer-layer thickness on the structure, giant magnetoresistance, and coercivity of DC sputtered Cr(tCr)/[Co90Fe10(15Å)/Cu(23Å)]8/Cr(10Å) superlattices has been investigated. A drastic change of hysteresis in a short interval of the buffer layer thickness (15 ÷ 20 Å) has been revealed. It has been shown that in superlattices with low coercivity the (111) texture is present, whereas superlattices without texture demonstrate a large coercivity and high GMR ratio.
Authors: Ramli, Mitra Djamal, Freddy Haryanto, Sparisoma Viridi, Khairurrijal
Abstract: The giant magnetoresistance thin film of (Ni60Co30Fe10/Cu) trilayer were grown onto Si (100) substrate by dc-opposed target magnetron sputtering (dc-OTMS) technique. The growth parameters are: temperature of 100 0C, applied voltage of 600 volt, flow rate of Ar gas of 100 sccm, and growth pressure of 5.2 x10-1 Torr. The effects of Cu layer thickness and NiCoFe layer thickness on giant magnetoresistance (GMR) property of (Ni60Co30Fe10/Cu) trilayer were studied. We have found that the giant magnetoresistance (GMR) ratio of the sample was varied depend on the non-magnetic (Cu) layer thickness. The variation of Cu layer thickness presents an oscillatory behavior of GMR ratio. This oscillation reflects the exchange coupling oscillations between ferromagnetic and antiferromagnetic states, which are caused by an oscillation in the sign of the interlayer exchange coupling between ferromagnetic layers. The GMR ratio is change with increasing of NiCoFe layer thickness and presents GMR ratio of 70.0 % at tNiCoFe = 62.5 nm.
Authors: João P. Araújo, Pedro B. Tavares, Vitor S. Amaral, A. Lourenço, J. Bessa Sousa, Joaquim M. Vieira
Authors: J. Wecker, W. Clemens, E. Hufgard
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