Magnetoresistance, Micromagnetism, and Domain Wall Scattering in Epitaxial hcp Co Films

Details Magnetoresistance, Micromagnetism, and Domain Wall Scattering in Epitaxial hcp Co Films Magnetoresistance, Micromagnetism, and Domain Wall Scattering in Epitaxial hcp Co Films

1999-01-22

arxiv.org/abs/cond-mat/9901245v1

Physical Review B, 59(18),11914 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 Figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.59.11914

Large negative magnetoresistance (MR) observed in transport measurements of hcp Co films with stripe domains were recently reported and interpreted in terms of a novel domain wall (DW) scattering mechanism. Here detailed MR measurements, magnetic force microscopy, and micromagnetic calculations are combined to elucidate the origin of MR in this material. The large negative room temperature MR reported previously is shown to be due to ferromagnetic resistivity anisotropy. Measurements of the resistivity for currents parallel (CIW) and perpendicular to DWs (CPW) have been conducted as a function of temperature. Low temperature results show that any intrinsic effect of DWs scattering on MR of this material is very small compared to the anisotropic MR.

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