Z. G. Khim

Detection and control of ferroelectric domains by an electrostatic force microscope

An electrostatic force microscopy (EFM) method has been used for the detection and control of the microdomain in ferroelectric single crystal [triglycine sulfate (TGS)] and thin film piezoelectric transducer (PZT). In this method, EFM is operated in a dynamic contact mode that allows a simultaneous measurement of the topographic and domain contrast images. Through the analysis of the force between the tip and ferroelectric surface, the surface charge density of TGS single crystal is obtained. Polarization charge density of TGS obtained in this method is 2.7 μC/cm2 at room temperature. A complex pattern was written on a PZT film by the polarization reversal. The line shape or the intensity of the reoriented domain does not show any noticeable dependence on the writing speed. The threshold bias for writing on a PZT film studied in this work was 4 V.

Effect of Mg(OH)2 on YBa2Cu3O7 thin film on MgO substrate studied by atomic force microscope

We observed the surface degradation of MgO single‐crystal substrates stored in humid air after cleavage by atomic force microscope. Annealing at 1000 °C in dry oxygen removed local defects though residual subgrain structure remains. The morphology of YBa2Cu3O7−δ (YBCO) films on the annealed and degraded substrates reflects these changes of the substrates. We confirmed that the annealing process of degraded substrate improves the film quality by measuring transition temperature Tc and critical current Jc of each film.

Atomic Force Microscopy Study of Mn12O12(O2CC4H3S)16(H2O)4 Single-Molecule Magnet Adsorbed on Au Surface

A film of Mn12O12(O2CC4H3S)16(H2O)4 molecules was chemically deposited onto an atomically flat Au(111) surface. The surface morphology of the film and the elastic property of the molecules were investigated using tapping-mode atomic force microscopy. The molecules were determined to be randomly arranged with an abnormal height distribution due to the anisotropic shape and bonding probability of the molecules. We also measured the amplitude-distance curves for the molecules and determined that the mechanical stiffness ks of the molecules adsorbed on the Au(111) surface is about 0.2 N/m.

Carrier-mediated ferromagnetic ordering in Mn ion-implanted p+GaAs: C

Highly p-type GaAs:C was ion implanted with Mn at differing doses to produce Mn concentrations in the 1\char21{}5 at. % range. In comparison to LT-GaAs and

Measurement of the superconducting gap of MgB2 by point contact spectroscopy

{n}^{+}\mathrm{GaAs}:\mathrm{Si}

Control of the Microstructure of (Pb,La)TiO3 Thin Films by Metal-Organic Chemical Vapor Deposition Using a Solid Delivery System for Ferroelectric Domain Memory

samples implanted under the same conditions, transport and magnetic properties show marked differences. Transport measurements show anomalies, consistent with observed magnetic properties and with epi-LT-(Ga,Mn)As, as well as the extraordinary Hall effect up to the observed magnetic ordering temperature

Josephson vortex dynamics in Bi2Sr2CaCu2O8+δ intrinsic Josephson junctions under high magnetic field

{(T}_{C}).

Observation of disorder induced crossover in the underlying mechanism for the anomalous Hall Effect and intrinsic spin currents in Ga1-xMnxAs

Mn ion-implanted

Transport properties of YBa2Cu3O7-(delta)/PrBa2Cu3O7-(delta) superlattices

{p}^{+}\mathrm{GaAs}:\mathrm{C}

Synthesis and Magnetic Studies of Uniform Iron Nanorods and Nanospheres

with as-grown carrier concentrations