Micromagnetism and magnetotransport properties of micron-sized epitaxial CrO2„100... wires
نویسندگان
چکیده
We report a detailed study of the magnetic domain configurations and the magnetization reversal in epitaxial CrO2 100 wires 0.5–5 m widths patterned along different crystallographic directions. Magnetic force microscopy imaging in zero field reveals single domain states for wires fabricated along the magnetic easy axis, while wires perpendicular to the magnetic easy axis exhibit a stripe domain configuration. The behavior in an applied field and the switching of the magnetization is probed by magnetoresistance MR measurements. Depending on the orientation of the wire with respect to the easy and hard magnetocrystalline anisotropy axes and the field direction, distinctly different reversal modes are observed including inhomogeneous magnetization configurations. These modes and configurations can be explained taking into account the interplay between the different anisotropy terms. MR measurements at variable temperatures demonstrate that the low temperature MR response is dominated by intergrain-tunneling magnetoresistance, while at elevated temperatures it is superseded by the anisotropic MR.
منابع مشابه
Magnetotransport properties of polycrystalline and epitaxial chromium dioxide nanowires
Temperature dependent magnetotransport measurements were performed on polycrystalline and epitaxial chromium dioxide CrO2 nanowires fabricated using the selective-area growth technique. Polycrystalline nanowires showed a negative temperature coefficient of resistivity at low temperatures because of strong grain boundary scattering. The magnetoresistance MR value exhibited a width dependence, re...
متن کاملMagnetotransport in high mobility epitaxial graphene
Epitaxial graphene layers grown on single-crystal SiC have large structural coherence domains and can be easily patterned into submicron structures using standard microelectronics lithography techniques. Patterned structures show two-dimensional electron gas properties with mobilities exceeding 3 m2/Vs. Magnetotransport measurements (Shubnikov–de Haas oscillations) indicate that the transport p...
متن کاملGrowth 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...
متن کاملHigh-Quality CrO2 Nanowires for Dissipation-less Spintronics
Superconductor-ferromagnet (S-F) hybrids based on half-metallic ferromagnets, such as CrO2, are ideal candidates for superconducting spintronic applications. This is primarily due to the fully spin-polarized nature of CrO2, which produces enhanced long-range triplet proximity effects. However, reliable production of CrO2-based Josephson junctions (JJs) has proved to be extremely challenging bec...
متن کامل