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| 2. |
- Fraerman, A. A., et al.
(författare)
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Magnetic force microscopy to determine vorticity direction in elliptical Co nanoparticles
- 2004
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Ingår i: Physics of low-Dimensional structures. - 0204-3467. ; 1-2, s. 35-40
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Tidskriftsartikel (refereegranskat)abstract
- We present a magnetic force microscopy investigation into the magnetic properties of arrays of Co nanoparticles fabricated by electron be am lithography. Vorticity directions are determined in zero applied magnetic fields. Experimental dependence of height on stable magnetic states of the particles is investigated. The statistics of the vorticity direction distribution is discussed.
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| 3. |
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| 4. |
- Pokropivny, A.V., et al.
(författare)
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Study of Nanoscale Contacts with the Help of Combined TEM-AFM Technique and Theoretical MD-TM Calculations: In situ Transformations of Gold Nanowires
- 2004
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Ingår i: Physics of low-Dimensional structures. - 0204-3467. ; 1-2, s. 83-90
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Tidskriftsartikel (refereegranskat)abstract
- Nanoscale gold contacts were investigated both experimentally and theoretically. Simulations of in situ processes in a new combined TEM-AFM microscope were performed by molecular dynamics and theoretical mechanics methods. Atomistic transformations of gold nanometer-sized wires (nanowires) between Au-probe and Au-surface were studied in processes both of loading-unloading and in the normal, lateral, diagonal and zigzag directions of the probe motion. Molecular dynamics was used for studies of "adhesion avalanche", shear and strain deformations. Theoretical mechanics was used for studies of jump-to-contact and jump-off-contact phenomena. Reorientations from (100) to (111) planes with formation of extended zigzag, vacancy cavities, a double-neck creation and a slip along the (110) plane with formation of twins and steps were observed. Deformation mechanisms were shown to depend on schemes of motions and on the ratio between the relative velocity of the probe and surface motion and the velocity of the defect relaxation.
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| 5. |
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| 6. |
- Pourovskii, LV, et al.
(författare)
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Surface energies and magnetic properties of Ni monolayer on Cu (001) substrate
- 1998
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Ingår i: PHYSICS OF LOW-DIMENSIONAL STRUCTURES. - : V S V CO. LTD. - 0204-3467. ; 9-10, s. 133-139
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Surface energies and magnetic properties of Ni/Cu (100) systems with different positions of a Ni monolayer in a Cu matrix have been calculated, using the interface Green's functions technique in the tight-binding LTMO basis within the atomic sphere approx
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| 7. |
- Smirnova, EA, et al.
(författare)
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Surface segregation in AlZn random alloys
- 1999
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Ingår i: PHYSICS OF LOW-DIMENSIONAL STRUCTURES. - : V S V CO. LTD. - 0204-3467. ; 5-6, s. 113-116
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We present a study of the surface segregation at the (111) surface of a random Al50Zn50 alloy and a study of an AlZn alloy at the (111) surface of Al at zero temperature by means of the linear muffin-tin orbitals Green's function technique. We find that z
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| 8. |
- Soldatov, ES, et al.
(författare)
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Correlated electron tunneling in the single-molecule nanosystems
- 2002
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Ingår i: Physics of Low-Dimensional Structures. - 0204-3467. ; 1-2, s. 113-134
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Tidskriftsartikel (refereegranskat)abstract
- The original approach to the creation of high-temperature single-electron tunneling systems has been developed based on the use of nanocluster molecules. The morphology and electron tunneling characteristics through single nanocluster molecules organized as highly-ordered monolayer Langmuir-Blodgett films on atomically-flat graphite substrate have been studied experimentally using scanning tunneling microscopy (STM) and spectroscopy techniques with sub-nanometer spatial resolution in a double barrier tunnel junction configuration "STM" tip - monomolecular film - conducting substrate" at ambient conditions. Molecular single-electron transistors on the basis of a single nanocluster molecule operating at room temperature were constructed and studied. Various nanocluster molecules with cores from 3 to 23 metal atoms were used as a central electrode in these transistors. Computer simulation of I-V curves of molecular single-electron tunneling (SET) transistor was carried out using the modified theory of single-electronics with consideration of discreteness of the energy spectrum of a molecule as well as the effects of energy relaxation of electrons in the molecule. A comparison of the simulated I-V curves with the experimental ones allow to conclude that the experimental data correspond to the slow energy relaxation case.
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| 9. |
- Tatte, T, et al.
(författare)
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Metal oxide based SPM tips prepared by sol-gel method
- 2002
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Ingår i: Physics of Low-Dimensional Structures. - 0204-3467. ; 5-6, s. 31-37
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Tidskriftsartikel (refereegranskat)abstract
- Up to date SNOM tips have. been prepared from SiO2 based materials using etching or locally melt fibre's stretching for tip sharpening [1,2] Usage of other metal oxides has been restricted because of the lack Of methods for obtaining the tips with suitable geometrical configuration. In our previous work we have proposed the technique for preparing transparent and electroconductive SnO2 fibres and tips by sol-gel method [3]. In the present investigation we have demonstrated that the sol-gel method provides the wide range of metal oxides to obtain SPM fibre tips. The new method of preparation enables to study tips based on oxide or oxide mixtures to create sensors with new properties for different applications. We propose some methods for preparing suitable precursors for spinning of pure and mixed TiO2, SnO2, SiO2 fibres. In those new methods the sharpening of tips is achieved in fibre drawing procedure. That is carried out at room temperature in humid atmosphere and then fibres are baked at 300-700degreesC for crystallisation of the material.
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