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The interaction and tunneling conductance between oppositely located ends of coaxial carbon nanotubes are studied by the example of two (11,11) nanotubes with open ends terminated by hydrogen atoms. The Green function formalism is applied…

Mesoscale and Nanoscale Physics · Physics 2014-06-16 A. M. Popov , I. V. Lebedeva , A. A. Knizhnik , Yu. E. Lozovik , N. A. Poklonski , A. I. Siahlo , S. A. Vyrko , S. V. Ratkevich

We observe spin-valve-like effects in nano-scaled thermally evaporated Co/AlOx/Au tunnel junctions. The tunneling magnetoresistance is anisotropic and depends on the relative orientation of the magnetization direction of the Co electrode…

Popular Physics · Physics 2015-05-13 R. S. Liu , L. Michalak , C. M. Canali , L. Samuelson , H. Pettersson

High magnetic fields were used to deform spherical nanocapsules, self-assembled from bola-amphiphilic sexithiophene molecules. At low fields the deformation -- measured through linear birefringence -- scales quadratically with the capsule…

We have theoretically explored the spin-orbit interaction in carbon nanotubes. We have found that, besides the dependence on chirality and diameter, the effects of spin-orbit coupling are anisotropic: spin splitting is larger for the higher…

Mesoscale and Nanoscale Physics · Physics 2015-05-13 L. Chico , M. P. Lopez-Sancho , M. C. Munoz

Magnetoelectric crystals have the interesting property that they allow electric fields to induce magnetic polarizations, and vice versa, magnetic fields to generate ferroelectric polarizations. Having such a magnetoelectric coupling usually…

Mesoscale and Nanoscale Physics · Physics 2024-01-08 Carmine Ortix , Jeroen van den Brink

We investigate the magnetization dynamics in nanomagnet vertices often found in artificial spin ices. Our analysis involves creating a simplified model that depicts edge magnetization using magnetic charges. We utilize the model to explore…

Mesoscale and Nanoscale Physics · Physics 2024-07-15 Samuel D. Slöetjes , Matías P. Grassi , Vassilios Kapaklis

We investigate the effect of curvature on the energy and stability of domain wall configurations in curved cylindrical nanotubes and nanowires. We use micromagnetic simulations to calculate the phase diagram for the transverse wall (TW) and…

Mesoscale and Nanoscale Physics · Physics 2021-06-22 L. Skoric , C. Donnelly , C. Abert , A. Hierro-Rodriguez , D. Suess , A. Fernández-Pacheco

Using the calculated electron energy band structure of Tl2Ba2CuO6, we compute the dependence of the c axis magnetoresistance on the orientation of the magnetic field for different magnitudes of the magnetic field. We explain the known…

Superconductivity · Physics 2007-05-23 Adrian Dragulescu , Victor M. Yakovenko , David J. Singh

We investigate the response of multi-walled carbon nanotubes to mechanical strain applied with an Atomic Force Microscope (AFM) probe. We find that in some samples, changes in the contact resistance dominate the measured resistance change.…

Mesoscale and Nanoscale Physics · Physics 2009-10-31 S. Paulson , M. R. Falvo , N. Snider , A. Helser , T. Hudson , A. Seeger , R. M. Taylor , R. Superfine , S. Washburn

Analytic arguments have been advanced that the degree of differential rotation in a neutron star depends on whether the topology of the internal magnetic field is open or closed. To test this assertion, the ideal-magnetohydrodynamics solver…

High Energy Astrophysical Phenomena · Physics 2020-04-23 F. Anzuini , A. Melatos

The paper investigates the behavior of 0 degree domain boundaries arising in uniaxial magnetic films with flexomagnetoelectric effect in a magnetic field. It is shown that at certain orientations of the magnetic field, it is possible to…

Materials Science · Physics 2023-10-04 Robert Vakhitov , Rostislav Solonetsky , Alina Ibragimova

A spin model of LiCu2O2 compound with ground state of ellipsoidal helical structure has been adopted. Taking into account the interchain coupling and exchange anisotropy, we focus on the magnetoelectric properties in a rotating magnetic…

Materials Science · Physics 2015-06-18 Yan Qi , An Du

In the search for rare-earth free permanent magnets, various ideas related to shape anisotropy are being pursued. In this work we assess the limits of shape contributions to the reversal stability using micromagnetic simulations. In a first…

Materials Science · Physics 2016-03-30 Simon Bance , Johann Fischbacher , Thomas Schrefl , Inga Zins , Gotthard Rieger , Caroline Cassignol

We studied the collapse of rotating molecular cloud cores with inclined magnetic fields, based on three-dimensional numerical simulations.The numerical simulations start from a rotating Bonnor-Ebert isothermal cloud in a uniform magnetic…

Astrophysics · Physics 2009-11-11 Masahiro N. Machida , Tomoaki Matsumoto , Tomoyuki Hanawa , Kohji Tomisaka

We consider the effect of the magnetic field background in the form of a tube of the finite transverse size on the vacuum of the quantized charged massive scalar field which is subject to the Dirichlet boundary condition at the edge of the…

High Energy Physics - Theory · Physics 2011-10-30 V. M. Gorkavenko , Yu. A. Sitenko , O. B. Stepanov

Magnetic moments dilutely dispersed in a metallic host tend to be coupled through the conduction electrons of the metal. This indirect exchange coupling, known to occur for a variety of magnetic materials embedded in several different…

Strongly Correlated Electrons · Physics 2008-03-04 A. T. Costa , R. B. Muniz , M. S. Ferreira

The ability to manipulate the relative magnetization alignment between ferromagnetic source and drain electrodes attached to a molecule or small quantum dot is a prerequisite for a number of spintronic device applications. The influence of…

Mesoscale and Nanoscale Physics · Physics 2016-04-08 Gavin D. Scott

We show that atomic alignment presents a reliable way to study topology of astrophysical magnetic fields. The effect of atomic alignment arises from modulation of the relative population of the sublevels of atomic ground state pumped by…

Astrophysics · Physics 2008-11-26 Huirong Yan , A. Lazarian

Repulsion, induced from quantum vacuum fluctuations, for an anisotropically polarizable atom on the symmetry axis of an anisotropically polarizable annular disc is studied. There exists two torsion free points on each side of the annular…

Quantum Physics · Physics 2021-09-15 John Joseph Marchetta , Prachi Parashar , K. V. Shajesh

The ground state of colloidal magnetic particles in a modulated channel are investigated as function of the tilt angle of an applied magnetic field. The particles are confined by a parabolic potential in the transversal direction while in…

Soft Condensed Matter · Physics 2014-04-02 J. E. Galván-Moya , D. Lucena , W. P. Ferreira , F. M. Peeters