Tag: nanowires

Novel protocol for mass production of nanowires

Novel protocol for mass production of nanowires

Nanotechnology is one of the major driving forces behind the technological revolution of this century and nanomaterials play a key role in this revolution. While the use of nanoparticles is widespread in industrial applications, the use of nanowires -wires with a diameter of only a few nanometres- is mostly reduced to scientific areas. The fields of biomedicine and permanent magnets would benefit from the cost-effective mass production of nanowires.

In a recent publication, researchers from the Universidad Complutense de Madrid (UCM) and various centres from the Consejo Superior de Investigaciones Científicas (CSIC), in collaboration with ALBA, have established a novel and sustainable synthesis protocol that allows obtaining a greater number of nanowires than conventional laboratory fabrication processes with considerably reduced production time and cost.

The goal of this project was to increase the production of metallic nanowires, reducing costs and timings to expand their applicability to industry. Due to the high costs associated with the high-purity aluminium normally used as the starting material, as well as with the low temperature and large anodization time, the commercial application of nanowires using anodized aluminium oxide is still limited by their fabrication process.

Read more on the ALBA website

Image: The CIRCE beamline (variable polarization soft X-ray beamline dedicated to advanced photoemission experiments)

Credit: ALBA

“Nano-Barber poles”: Helical surface magnetization in nanowires

“Nano-Barber poles”: Helical surface magnetization in nanowires

Nanomagnetism is nowadays expanding into three dimensions, triggered by the discovery of new magnetic phenomena and their potential use in applications. This shift towards 3D structures should be accompanied by strategies and methodologies to map the tridimensional spin textures associated.

A new study fruit of a collaboration of researchers from two beamlines at ALBA Synchrotron (CIRCE and MISTRAL), with the participation of the Universidad Complutense de Madrid, IMDEA Nanociencia and the Universidad de Salamanca shows that cylindrical nanowires have at the center a magnetization aligned with the axis of the wire and at the surface a magnetization that describes helical lines as the barber poles. The helicity provides chirality to the magnetic configuration since it can be right or left-handed. Researchers found out that two adjacent magnetic domains having opposite chirality are more difficult to move than two adjacent domains with the same chirality. This result evidences the role of the chirality on the dynamics of the domain walls that might be used as a practical variable for magnetic data storage.

Read more on the ALBA website

Image: Figure. (Left) Barber pole illustrating the helical lines that the magnetization describes at the surface of the wires. (Right) Schematics of the configuration of the magnetization of the initial state of the nanowire together with the magnetic images before and after the application of magnetic field pulses. In the initial state, the two domain walls signaled with orange arrows separate domains with the same chirality. Note that the head-to-head or tail-to-tail domains have the same chirality in spite of having opposite signs of surface magnetization. The green arrow separates two domains of different chirality since while having the same axial orientation, the surface helicity is opposite. Magnetic field pulses of 120 mT move the walls separating domains with the same chirality but not the green wall separating opposite chirality.