We investigate the nonlinear dynamics underlying the evolution of a 2-D ferromagnetic film with uniaxial anisotropy and an oscillating magnetic field. Considering the associated Landau-Lifshitz spin evolution equation with Gilbert damping included, we study the dynamics in terms of the stereographic variable. We identify several new fixed points for suitable choice of external field. In particu...

A. D. Harris, L. B. Andersen, R. K. Kosior, H. Chen, M. Salluzzi, R. B. Stafford, B. G. Goodyear, and R. Frayne School of Psychology, CUBRIC, Cardiff University, Cardiff, United Kingdom, Seaman Family MR Research Centre, Foothills Medical Centre, Calgary, Alberta, Canada, Clinical Neurosciences and Radiology, Univerisity of Calgary, Calgary, Alberta, Canada, Biomedical Engineering, Univerisity ...

Small-scale probe permeability measurements on differently oriented faces of highly compacted and quartz-cemented Viking Formation sandstones yield detailed permeability distributions that appear to be diagnostic of the grainand lamina-scale fabric of the samples. Permeability anisotropy of a single ‘structureless'-appearing sample is low, reflected by a kV / kH-ratio of 0.7; corresponding k-di...

A novel, all-optical method to excite and detect spin waves in magnetic materials is presented. By exploiting the temperature dependence of the magnetic anisotropy, an ultrashort laser pulse is efficiently converted in a picosecond "anisotropy field" pulse that triggers a coherent precession of the magnetization. Recording the temporal evolution of the precessing spins by a time-delayed probe-p...

naturally occurred soil deposits inherit heterogeneity and anisotropy in their strength properties. the main purpose of this paper is to model the soil stratum with anisotropy consideration and spatially varying undrained shear strength by using random field theory coupled with finite difference numerical analysis to evaluate their effect on the bearing capacity of the shallow foundations. in t...

The magnetic anisotropy in ferromagnetic chromium dioxide thin films (Tc;393 K) grown epitaxially on ~100! TiO2 substrates, is probed using precise rf transverse susceptibility (xT) measurements. Singular peaks in xT are observed that are associated with the anisotropy (6HK) and switching (6Hs) fields in CrO2. Theoretical calculations of xT based on a simple coherent rotation model display rema...

The lipid composition of archaea is unique and has been correlated with increased stability under extreme environmental conditions. In this article, we have focused on the evolution of membrane organization and dynamics with natural evolution. Dynamic anisotropy along the membrane normal (i.e., gradients of mobility, polarity, and heterogeneity) is a hallmark of fluid phase diester or diether p...