Extrinsic magnetotransport phenomena in ferromagnetic oxides

Magnetotransport in ferromagnetic Schottky diodes made of Mn-doped GaAs

Growth and magnetotransport study of thin ferromagnetic CrO2 films

Highly a-axis-textured CrO2 films have been deposited on Al2O3(0001) and on isostructural TiO2(100) substrates by a chemical vapour deposition technique. For Al2O3 substrates a columnar growth of CrO2(010) on an initial Cr2O3(0001) layer has been found in transmission electron microscopy as well as in x-ray diffraction investigations. The sixfold in-plane symmetry of a (0001)-oriented Cr2O3 ini...

Dissimilar Ferromagnetic Layer Dependence of Hot Electron Magnetotransport

The material dependence of hot electron magnetotransport in a spin-valve transistor has been theoretically explored. We calculate the parallel and antiparallel collector current changing the types and relative spin orientation of the ferromagnetic layers. The magnetocurrent has been presented as well. In this calculations, spin dependent self energy effect of hot electron in ferromagnetic mater...

Origin of ferromagnetic response in diluted magnetic semiconductors and oxides

This paper reviews the present understanding of the origin of ferromagnetic response that has been detected in a number of diluted magnetic semiconductors (DMS) and diluted magnetic oxides (DMO) as well as in some nominally magnetically undoped materials. It is argued that these systems can be grouped into four classes. To the first belong composite materials in which precipitations of a known ...

Donor impurity band exchange in dilute ferromagnetic oxides.

Dilute ferromagnetic oxides having Curie temperatures far in excess of 300 K and exceptionally large ordered moments per transition-metal cation challenge our understanding of magnetism in solids. These materials are high-k dielectrics with degenerate or thermally activated n-type semiconductivity. Conventional super-exchange or double-exchange interactions cannot produce long-range magnetic or...