Magnetic cobalt nanocrystals organized in patches and chains

Abstract

Co nanocrystals have been prepared via two different chemical preparation routes. Microstructural characterization has been carried out by conventional and high-resolution transmission electron microscopy. Magnetic characterization reveals that Co nanocrystals with mean particle size distributions about 6 nm are ferromagnetic at room temperature. Superlattices of about 1 m 1 m can be reproduced. For the second preparation route the formation of an -Co phase was detected by X-ray diffraction. Whereas the pure Co nanocrystals form domains with a mixture of simple cubic and hexagonal packing, FeCo alloyed nanoparticles form long chain-like structures.

Tailoring magnetic nanocrystal superlattices by chemical engineering

“…3 Figure 1 ing mean particle diameter is ͗D͘ϭ(3.29Ϯ0.260) nm and the interparticle distance is ͗d͘ϭ(4.31Ϯ0.29) nm. 3 Figure 1 ing mean particle diameter is ͗D͘ϭ(3.29Ϯ0.260) nm and the interparticle distance is ͗d͘ϭ(4.31Ϯ0.29) nm.…”

“…3 The objective of this study is focused on the preparation of alloyed FeCo nanoparticles. The unique feature of such a nanocrystal is the combination of a metallic crystalline ͑in our case͒ magnetic core surrounded by an organic shell.…”

Effect of surface pinning on magnetic nanostuctures

“…Study of core-shell nanostructures have become popular recently as they find strong potential applications in different fields of research like biomedical [17,18], catalysts [19], memory device application [20] etc., as their magnetic properties can be varied easily by changing the size, shape, core or shell thickness, or other intrinsic properties. These materials can be used for magnetic switching [21], magnetotransport [22], micromechanical sensors [23], DNA separation [24], magnetic memory device [25]. bio-imaging and mag-netic resonance imaging enhancement [26], targeted drug delivery [27], etc..…”

Magnetic field-assisted solvothermal assembly of one-dimensional nanostructures of Ni–Co alloy nanoparticles

“…In many application fields including probes for magnetorheological fluid behavior [19], micromechanical sensors [20], electrical transport, magnetic switching [21], DNA separation, biomedical applications and thermal conductivity enhancement [22,23], chainlike structure of nanoparticles now is providing a driving force for fundamental research. Although scientists have made great achievements in one-dimensional nanostructures of elemental nickel and cobalt [11][12][13]24], to the best of our knowledge, no investigation has been reported on magnetic field effect on Ni-Co alloy particles in a solvothermal system.…”