Improved giant magnetoresistance in nanogranular Co/Ag: The role of interparticle RKKY interactions
نویسندگان
چکیده
J. A. De Toro,1,2,* J. P. Andrés,1 J. A. González,1 J. P. Goff,2 A. J. Barbero,1 and J. M. Riveiro1 1Departamento de Física Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain 2Department of Physics, University of Liverpool, Oliver Lodge Laboratory, Liverpool L69 7ZE, United Kingdom (Received 4 August 2004; revised manuscript received 9 September 2004; published 13 December 2004)
منابع مشابه
RKKY interactions between nanomagnets of arbitrary shape
– The RKKY interaction between well-separated magnetic particles in a nonmagnetic metallic matrix is calculated. It turns out that the net interaction can be mapped onto an RKKY interaction between two point-like effective moments. The effective moments exhibit a strongly oscillating dependence on the particle’s size, shape, and orientation, but their magnitudes are governed by scaling laws. As...
متن کاملCoFe–Cu granular alloys: From noninteracting particles to magnetic percolation
CoFe–Cu granular films with ferromagnetic content ranging from 0.10 to 0.33 by volume were prepared by radio frequency sputtering. As-cast samples were rapidly annealed at various temperatures up to 750 °C to promote the segregation of CoFe particles within the metallic matrix. Magnetic and transport properties suggested that this family of samples may be classified into three groups: ~i! below...
متن کاملSpin-Dependent Interface Transmission and Reflection in Magnetic Multilayers
First-principles calculations of transmission and reflection from Ag/Fe, Au/Fe, Cu/Co, and Cu/Ni interfaces show very strong spin dependence that differs significantly from expectations based on free electron approximations. The results can be used to understand both the giant magnetoresistance and the oscillatory exchange coupling observed in magnetic multilayers of these materials. The spin d...
متن کاملCpp-giant Magnetoresistance and Thermo-electric Power of Multilayers
Oscillations of magnetoresistance and thermo-electric power (TEP ) vs. both nonmagnetic spacer as well as ferromagnetic slab thicknesses are studied in the current-perpendicular-to-plane (CPP ) geometry, in terms of the single-band tight-binding model. The spin-dependent conductance has been calculated from the Kubo formula by means of a recursion Green’s function technique, and the TEP directl...
متن کاملMagnetic Properties and Structural Study of Ni-Co/Cu Multilayers Prepared by Electrodeposition Method
Ni-Co/Cu multilayers have been grown by electrodeposition method from a single electrolyte (based on Ni(SO4).6H2O, Co(SO4).7H2O, Cu(SO4) and H3BO3) using galvanostatic control on titanium sublayers. The X-ray diffraction (XRD) patterns confirmed the multilayered structure with the nanometer thicknesses. Also, electron diffraction x-ray (EDX) analysis confirmed the purity of deposited samples. ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004