Nanowires of magnetic metals (Ho, Gd) have been synthesized inside the hollow interior of single wall carbon nanotubes by the sealed-tube reaction. Amongst the dand f-series metal chlorides investigated in this study, HoCl3 and GdCl3 fill the SWNTs to a significantly higher extent than FeCl2 and CoCl2. HoCl3 and GdCl3 nanowires have been transformed into the respective metal nanowires via the r...

Recent studies in three-dimensional spintronics propose that the Œrsted field plays a significant role cylindrical nanowires. However, there is no direct report on its impact magnetic textures. Here, we use time-resolved scanning transmission x-ray microscopy to image dynamic response of magnetization Co30Ni70 nanowires subjected nanosecond pulses. We observe tilting longitudinally magnetized d...

Nanochemistry fabrication methods have improved remarkably over the last few years. Among the different strategies developed to elaborate nanomaterials, the templating method is one of the most attractive as it has proven to be reliable for the synthesis of arrays of nanowires and nanotubules of desired composition, sizes and aspect ratios. Chemical and electrochemical techniques are used for s...

The magnetothermopower and the magnetoresistance of single Co-Ni/Cu multilayered nanowires with various thicknesses of the Cu spacer are investigated. Both kinds of measurement have been performed as a function of temperature (50 K to 325 K) and under applied magnetic fields perpendicular to the nanowire axis, with magnitudes up to -15 % at room temperature. A linear relation between thermopowe...

Scanning Electron Microscopy with Polarization Analysis (SEMPA) provides high resolution (10 nm) magnetization images simultaneously with, but independent of, the topography. Such information is very useful in studying spintronics devices as illustrated by three examples: 1) exchange coupling of magnetic layers, 2) spin-transfer switching in magnetic nanowires, and 3) the ferromagnetic metal-se...

Thermoelectric properties of nanowires in a magnetic field are studied. Magnetic splitting of thermopower peaks associated with electronic energy levels that are degenerate at zero field, leading to the development of separate thermopower peaks at larger fields, are predicted. A scheme is described for measuring thermopower in a circuit containing a nanowire and leads made from the same materia...

We present evidence that in a very thin regime the magnetic layers become discrete islands and superparamagnetic in multilayered CoNi 1–17 nm /Cu 4.2 nm nanowires grown by pulsed electrodeposition using a hole pattern of anodized alumina templates. Magnetic hysteresis loops measured at room temperature using a vibrating sample magnetometer show that superparamagnetism appears at t CoNi 1.7 nm, ...

We develop a systematic asymptotic description for domain wall motion in one-dimensional magnetic nanowires under the influence of small applied magnetic fields and currents and small material anisotropy. The magnetization dynamics, as governed by the Landau-Lifshitz-Gilbert equation, is investigated via a perturbation expansion. We compute leading-order behaviour, propagation velocities and fi...

We study multiband semiconducting nanowires proximity-coupled with an s-wave superconductor. We show that, when an odd number of subbands are occupied, the system realizes a nontrivial topological state supporting Majorana modes. We study the topological quantum phase transition in this system and calculate the phase diagram as a function of the chemical potential and magnetic field. Our key fi...

The development of high-density magnetic storage media based on magnetic nanostructures is currently attracting a great interest. The self-organization techniques reveal as one of the most efficient methods to obtain nanostructures in a large scale. Among these techniques (growth of islands, ion irradiation, particles assembly, etc) we have used the selective electrodeposition of metals to fabr...