Extrinsic Magnetotransport Phenomena in Ferromagnetic Oxides

Abstract

This review is focused on extrinsic magnetotransport effects in ferromagnetic oxides. It consists of two parts; the second part is devoted to an overview of experimental data and theoretical models for extrinsic magnetotransport phenomena. Here a critical discussion of domain-wall scattering is given. Results on surfacial and interfacial magnetism in oxides are presented. Spin-polarized tunnelling in ferromagnetic junctions is reviewed and grain-boundary magnetoresistance is interpreted within a model of spin-polarized tunnelling through natural oxide barriers. The situation in ferromagnetic oxides is compared with data and models for conventional ferromagnets. The first part of the review summarizes basic material properties, especially data on the spin-polarization and evidence for half-metallicity. Furthermore, intrinsic conduction mechanisms are discussed. An outlook on the further development of oxide spin-electronics concludes this review.

133 pages, 47 figures, submitted to Rep. Prog. Phys

References in corpus (4)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Charge Transport in Manganites: Hopping Conduction, the Anomalous Hall Effect and Universal Scaling
• Evidence for novel polaronic Fermi-liquid in doped oxides
• Exchange Field Induced Magnetoresistance in Colossal Magnetoresistance Manganites

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