Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Physics
Scaling Of Voltage-Current Characteristics Of Thin-Film Y-Ba-Cu-0 At Low Magnetic Fields, Brandon R. Brown
Scaling Of Voltage-Current Characteristics Of Thin-Film Y-Ba-Cu-0 At Low Magnetic Fields, Brandon R. Brown
Physics and Astronomy
We have measured voltage-current characteristics for YBa2Cu3O7 thin films in magnetic fields from 5 T to ambient, including some in the millitesla range. In all cases, the resistivity-current density isotherms can be separated into two classes: those which exhibit upward curbature, and have constant resistivity at low currents, and those which exhibit downward curvature at all currents. These two classes of isotherms are separated by a field-dependent temperture Tg. For each field, the isotherms scale in a manner consistent with a three dimensional vortex-liquid to vortex-glass phase transition. The region that can be scaled is several kelving at 5 T …
Effective Internal Fields And Magnetization Buildup For Magnetotransport In Magnetic Multilayered Structures, Horacio E. Camblong
Effective Internal Fields And Magnetization Buildup For Magnetotransport In Magnetic Multilayered Structures, Horacio E. Camblong
Physics and Astronomy
Starting with the Kubo formula for electric conductivity we derive a set of equations that define the spin diffusion that is present when current is driven through inhomogeneous magnetic media. We show the spin accumulation, or nonequilibrium magnetization, attendant to charge transport through regions of inhomogeneous magnetization is governed by the same equations found in a thermodynamic approach to magnetoelectric transport.
Theory Of Magnetotransport In Inhomogeneous Magnetic Structures, Horacio E. Camblong
Theory Of Magnetotransport In Inhomogeneous Magnetic Structures, Horacio E. Camblong
Physics and Astronomy
The origin of the giant magnetoresistance of magnetic multilayers and magnetic granular solids is investigated through a unified spin‐dependent linear transport theory, in which the primary source of electrical resistivity is short‐range scattering by impurities in the different magnetic or nonmagnetic regions and at the interfaces. Our theory predicts that magnetotransport in granular solids is similar to that for currents perpendicular to the plane of the layers in multilayers in that their magnetoresistance is independent of the average distance between adjacent magnetic regions.