J. Kötzler

Magnetoresistance anisotropy of polycrystalline cobalt films: Geometrical-size and domain effects

The magnetoresistance (MR) of

Damping of Spin Waves and Singularity of the Longitudinal Modes in the Dipolar Critical Regime of the Heisenberg-Ferromagnet EuS

10\char21{}200\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

Effect of La-doping on growth and superconductivity of Bi-2212 crystals

thin polycrystalline Co-films, deposited on glass and insulating Si(100), is studied in fields up to

Vortex fluctuations and freezing of dipolar-coupled granular moments in thin ferromagnetic films

120\phantom{\rule{0.3em}{0ex}}\mathrm{kOe}

Vector network analysis in swept-frequency microwave spectroscopy at low temperatures

, aligned along the three principal directions with respect to the current: Longitudinal, transverse (in-plane), and polar (out-of-plane). At technical saturation, the anisotropic MR (AMR) in polar fields turns out to be up to twice as large as in transverse fields, which resembles the yet unexplained geometrical size-effect (GSE), previously reported for Ni- and Permalloy films. Upon increasing temperature, the polar and transverse AMRs are reduced by phonon-mediated sd-scattering, but their ratio, i.e., the GSE remains unchanged. Basing on Potterss theory [Phys. Rev. B 10, 4626 (1974)], we associate the GSE with an anisotropic effect of the spin-orbit interaction on the sd-scattering of the minority spins due to a film texture. Below magnetic saturation, the magnitudes and signs of all three MRs depend significantly on the domain structures depicted by magnetic force microscopy. Based on hysteresis loops and taking into account the GSE within an effective medium approach, the three MRs are explained by the different magnetization processes in the domain states. These reveal the importance of in-plane uniaxial anisotropy and out-of-plane texture for the thinnest and thickest films, respectively.

Strong spin-orbit-induced Gilbert damping and g-shift in iron-platinum nanoparticles

By inelastic scattering of polarized neutrons near the (200) Bragg reflection, the susceptibilities and linewidths of the spin waves and the longitudinal spin fluctuations,

Determination of the in-plane microwave conductivity of superconducting films

\ensuremath{\delta}{\mathbf{S}}_{\mathrm{sw}}(\mathbf{q})

Contact-free determination of ultralow resistances of micron-sized wires

and

Maximum entropy analysis of dipolar anisotropic magnetic scattering above TC in EuS

\ensuremath{\delta}{\mathbf{S}}_{z}(\mathbf{q})\ensuremath{\Vert}{\mathbf{M}}_{s},

Vortex dynamics in columnar-defected YBCO-films

respectively, were determined separately. By aligning the momentum transfers