Manipulation of precession modes in all-permalloy nanostripe-nanopillar structured spin torque nano-oscillator driven by direct current.

We investigated the dynamical behaviors of an all-permalloy structured spin-torque nano-oscillator (STNO) composed of a nanostripe with in-plane magneto-anisotropy and a free magnetized nanopillar in the absence of a non-magnetic spacer via a micro-magnetic simulation. It is found the newly-devised STNO exhibits two stable precession modes of magnetization in the nanopillar: out-of-plane precession mode and in-plane precession mode under varying applied DC current densities. The switching between the two modes is generated in a certain current density, depending on geometries of the nanopillar as well as the nanostripe.

Novel recyclable BiOBr/FeO/RGO composites with remarkable visible-light photocatalytic activity.

Magnetic BiOBr/FeO/RGO composites with remarkable photocatalytic capability were prepared by a simple hydrothermal method to load 3D flower-like microspherical BiOBr onto the surface of FeO/RGO. Under visible-light irradiation ( > 420 nm), the BiOBr/FeO/RGO composite with 56% mass percentage of FeO/RGO shows the optimal removal ability for Rhodamine B, and the total removal efficiency is 96%. The coupling of FeO/RGO and BiOBr elevates the conduction band of BiOBr, which enhances the reduction level of BiOBr/FeO/RGO composites.

Hydrothermal Synthesis of Ultra-Light Coal-Based Graphene Oxide Aerogel for Efficient Removal of Dyes from Aqueous Solutions.

A novel carboxymethyl cellulose (CMC)-supported graphene oxide aerogel (CGOA) was fabricated from a cost-effective and abundant bituminous coal by a mild hydrothermal process and freeze-drying treatment. Such an aerogel has cross-linked graphene oxide layers supported by CMC, and therefore, displays high mechanical strength while having ultra-low density (8.257 mg·cm).