Size driven barrier to chirality reversal in electric control of magnetic vortices in ferromagnetic nanodiscs.

New high density storage media and spintronic devices come about with a progressing demand for the miniaturization of ferromagnetic structures. Vortex ordering of magnetic dipoles in such structures has been repeatedly observed as a stable state, offering the possibility of chirality in these states as a means to store information at high density. Electric pulses and magnetoelectric coupling are attractive options to control the chirality of such states in a deterministic manner.

Vapor phase synthesis of ferroelectric microislands on PVDF thin films.

The interest in patterned polyvinylidene fluoride (PVDF) surfaces has grown significantly in the recent years due to ability to control the ferroelectric behavior through the size and shape of the surface structures. However, forming micron sized structures on the PVDF surface generally requires laborious lithography based methods or use of templates which complicates the process. In this study, we report spontaneous formation of microislands with ferroelectric response during PVDF growth via initiated chemical vapor deposition.

Synthesis and Morphological Control of VO Nanostructures via a One-Step Hydrothermal Method.

The morphology of nanostructures is a vital parameter to consider in components comprised of materials exhibiting specific functionalities. The number of process steps and the need for high temperatures can often be a limiting factor when targeting a specific morphology. Here, we demonstrate a repeatable synthesis of different morphologies of a highly crystalline monoclinic phase of vanadium dioxide (VO(M)) using a one-step hydrothermal method.

A Theoretical Treatment of THz Resonances in Semiconductor GaAs p-n Junctions.

Semiconductor heterostructures are suitable for the design and fabrication of terahertz (THz) plasmonic devices, due to their matching carrier densities. The classical dispersion relations in the current literature are derived for metal plasmonic materials, such as gold and silver, for which a homogeneous dielectric function is valid. Penetration of the electric fields into semiconductors induces locally varying charge densities and a spatially varying dielectric function is expected.

Distribution of non-lumbricid earthworms (Clitellata: Acanthodrilidae, Criodrilidae, Megascolecidae and Ocnerodrilidae) on the Balkans and Anatolia with first record of Amynthas morrisi (Beddard, 1892) from Turkey.

Based on previous and on new species records, the non-lumbricid earthworm fauna of the Balkans and Anatolia consists of ten species, belonging to four families: Acanthodrilidae, with Microscolex dubius (Fletcher, 1886) and Microscolex phosphoreus (Dugès, 1837), Criodrilidae, with Criodrilus lacuum Hoffmeister, 1845 and Criodrilus ochridensis Georgevitch, 1950, Megascolecidae, with Amynthas corticis (Kinberg, 1867), Amynthas gracilis (Kinberg, 1867), Amynthas morrisi (Beddard, 1892), Metaphire californica (Kinberg, 1867), and Pontodrilus litoralis (Grube, 1855), and Ocnerodrilidae, with Ocnerodrilus occidentalis Eisen, 1878. Four species are recorded on the both territories (C. lacuum, M.