Browsing Physics by Subject "Particles and fields physics"
Now showing items 1-14 of 14
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An adjustable linear Halbach array
(Elsevier, 2012)The linear Halbach array is a well known planar magnetic structure capable, in the idealized case, of generating a one-sided magnetic field. We show that such a field can be created from an array of uniformly magnetized ... -
Defect-trapped electrons and ferromagnetic exchange in ZnO
(2011)A model for ferromagnetism observed at ambient temperature in films of oxides such as ZnO is proposed and evaluated. The ferromagnetic moment in the model arises from electrons trapped at negatively charged vacancies in ... -
Exceptionally strong magnetism in the 4d perovskites RTcO3 (R = Ca, Sr, Ba)
(2011)The evolution of the magnetic ordering temperature of the 4d3 perovskites RTcO3 (R=Ca, Sr, Ba) and its relation with its electronic and structural properties has been studied by means of hybrid density functional theory ... -
Expansion dynamics of laser produced plasma
(2011)We consider the applicability of the isentropic, adiabatic gas dynamical model of plume expansion for laser ablation in vacuum. We show that the model can be applied to ionized plumes and estimate the upper electron ... -
High-resolution near-field measurements of microwave circuits
(2004)In this paper we report on measurements of electric field intensities of microwave field above surface of microwave circuits using miniaturized coaxial antennas. During the scanning process the antenna is driven at ... -
Influence of an Au capping layer on the magnetic properties of CoPt nanowires
(2011)Equiatomic CoPt nanowires with a gold cap layer have been fabricated by electrochemical template synthesis. Au improves the structural and magnetic properties of the L10 ordered CoPt, leading to coercivities of up to 1.43 ... -
Magnetic Structuring of Electrodeposits
(2011)Metal electrodeposition reflects the pattern of the magnetic field at the cathode surface created by a magnet array. For deposits from paramagnetic cations such as Co2+ or Cu2+, the effect is explained in terms of magnetic ... -
Measurement of electric-field intensities using scanning near-field microwave microscopy
(2003)In this paper, we propose methods for the measurement of electric intensities of a microwave field above the surface of microwave circuits. Using miniaturized coaxial antennas, we measure all spatial components of the ... -
New evidence for the influence of step morphology on the formation of Au atomic chains on vicinal Si(111) surfaces
(2010)Gold atomic chain structures that grow on singular and vicinal Si(111) surfaces have attracted considerable interest as model systems for exploring quasi-one-dimensional metallic behaviour. The structure of the prototypical ... -
Non-contact high resolution microwave scanning measurement technology
(IEEE, 2003)For non-contact inspection of microwave integrated and hybrid circuits a technical concept and realisation of a high resolution scanning technique for the detection of the electric field distribution has been developed. ... -
A pertubative approach to the Kondo effect in magnetic atoms on nonmagnetic substrates
(2011)Recent experimental advances in scanning tunneling microscopy make the measurement of the conductance spectra of isolated and magnetically coupled atoms on nonmagnetic substrates possible. Notably these spectra are ... -
Quantum corrections to the Ising interactions in LiYxHo1-xF4
(Springer, 2008)We systematically derive an effective Hamiltonian for the dipolar magnet LiY1?xHoxF4, including quantum corrections which arise from the transverse dipolar and hyperfine interactions. These corrections are derived using ... -
Selecting the tip electron orbital for scanning tunneling microscopy imaging with sub-?ngstrom lateral resolution
(Institute of Physics, 2010)We report on scanning tunneling microscopy (STM) studies performed with single crystalline W[001] tips on a graphite(0001) surface. Results of distance-dependent STM experiments with sub-?ngstrom lateral resolution and ... -
Spin-polarized electron tunneling across magnetic dielectric
(2005)This letter deals with a magnetic tunnel junction having spin filtering by a magnetic barrier. We performed experiments in which a relatively strong external field rotates magnetizations of both ferromagnetic electrodes ...