Effect of the Damping on the Magnetization of Antiferromagnetic Nanoparticles in a Presence of an Oblique Magnetic Field

The magnetization of antiferromagnetic nanoparticles is investigated with the Fokker-Planck equation describing the evolution of the distribution function of the magnetization of an nanoparticle. By solving this equation numerically, the relaxation times, and dynamic susceptibility are calculated for dc field orientations across wide ranges of frequencies, amplitude of the fields and damping. Analytic equation for the dynamic susceptibility is also proposed. It is shown that the damping alters the magnetization in the presence of oblique field applied

Effect of a Dc Oblique Magnetic Field on the Magnetic Susceptibility of the Super-Paramagnetics Nanoparticles in Very Low Damping

The Magnetic Susceptibility of an individual Super-Paramagnetic nanoparticle in a presence of DC Oblique magnetic fields of arbitrary amplitude is investigated using Brown’s continuous diffusion model. The susceptibility is calculated and compared when for extensive ranges of the anisotropy, the dc magnetic fields in the very low damping with Matrix continued Fraction. It is shown that the shape of the Spectrum of Super-Paramagnetic nanoparticles is substantially altered by applying a dc oblique field. There is also an inherent geometric dependence of the complex susceptibility on the damping parameter arising from coupling of longitudinal and transverse relaxation modes

Improvements in 3-D digital mapping for geomorphological and Quaternary geological cartography

In recent decades, GIS tools have been directly applied to photo-interpretative geomorphological and geological mapping. Although these tools are powerful and effective tools in the creation of digital maps, it is often very difficult to obtain a correct recognition of the nature and boundaries of geomorphological landforms using two-dimensional images. In addition, the output typically requires some improvements, usually by means of field verifications or using oblique field photographs. The aim of this paper is to present the ArcGDS™ tool, which allows the direct exploitation, visualization and digitization of stereoscopic digital linear scanned images (e.g. digital image strips, ©swisstopo). Through two case studies, we show how 3-D digital mapping makes it possible to produce Quaternary geological and geomorphological maps with a limited complementary fieldwork approach and to provide a quantitative assessment of surface deformations through the acquisition of precise elevation coordinates. Combined with high-resolution digital elevation models, ArcGDS™ is a powerful tool, particularly over large areas, as well as under forest cover and on very steep slopes.