منابع مشابه
Ferromagnetic nanorings
Ferromagnetic metal rings of nanometre range widths and thicknesses exhibit fundamentally new spin states, switching behaviour and spin dynamics, which can be precisely controlled via geometry, material composition and applied f eld. Following the discovery of the ‘onion state’, which mediates the switching to and between vortex states, a range of fascinating phenomena has been found in these s...
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α- and β-cyclodextrins have been used as scaffolds for the synthesis of six- and seven-legged templates by functionalizing every primary CH2OH with a 4-pyridyl moiety. Although these templates are flexible, they are very effective for directing the synthesis of macrocyclic porphyrin oligomers consisting of six or seven porphyrin units. The transfer of chirality from the cyclodextrin templates t...
متن کاملMetastable states in magnetic nanorings
Magnetization states and hysteresis behavior of small ferromagnetic rings, of diameters 180–520 nm, have been investigated using magnetic force microscopy. In addition to the expected bi-domain ~‘‘onion’’! and flux-closed ~‘‘vortex’’! magnetization states, a metastable state has been found. This ‘‘twisted’’ state contains a 360° domain wall which can exist over a wide range of applied fields. F...
متن کاملNanohelixes/nanosprings and seamless nanorings
semiconducting oxides in 20011, research into functional oxide-based, one-dimensional nanostructures has rapidly expanded because of their unique and novel applications in optics, optoelectronics, catalysis, and piezoelectricity. Semiconducting oxide nanobelts are a unique group of quasi-one-dimensional nanomaterials, which have been systematically studied for a wide range of materials with dis...
متن کاملPersistent current in superconducting nanorings.
The superconductivity in very thin rings is suppressed by quantum phase slips. As a result, the amplitude of the persistent current oscillations with flux becomes exponentially small, and their shape changes from sawtooth to a sinusoidal one. We reduce the problem of low-energy properties of a superconducting nanoring to that of a quantum particle in a sinusoidal potential and show that the dep...
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ژورنال
عنوان ژورنال: ACS Nano
سال: 2008
ISSN: 1936-0851,1936-086X
DOI: 10.1021/nn800577h