We have studied the size effect on $\mathrm{L}{1}_{0}$ ordering of FePt (001) nanoparticles epitaxially grown MgO (001). From dark field images using 110 superlattice spots excited by incident electron beam along $[\overline{1}1l]$ $(l=4--6)$, critical for has been evaluated to be $d=1.5--2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ below which no occurs. Further, we taken an diffraction pattern each nanoparticle a nanometer-sized and determined respective long-range order parameter $S$...

Scanning electron microscope (SEM) and scanning ion (SIM) observations were performed to investigate the charging effect related contrast variation for images of conductive non-conductive specimens under Ga+ beam irradiations. The in was investigated by changing coating conditions. It found that basically caused differences atomic number is generally smaller than specimens. On other hand, SEM varied widely, depending on These variations be negative charges accumulated surface SIM changed...

Electron holography is a useful technique to directly visualize the electromagnetic fields in and around various functional materials at nanometer scale. The precision resolution of this have been drastically improved by using specialized instruments. From situ experiments applying electric current voltage these instruments, conductivity changes composite can be understood through their microstructure field variations. On other hand, magnetization processes magnetic also clarified changing...

By utilizing an alternating current (AC) magnetic system recently installed on our transmission electron microscope (TEM), in-situ Lorentz observations of electrical steel sheets were carried out under AC field. The domain walls moved smoothly a low frequency using diffraction contrast, interactions between precipitates and the motion visualized clarified. Eventually, found to be pinned at strain fields around precipitates. Observations higher also out. It was demonstrated that microscopic...

To investigate the interaction between magnetic domain walls and defects in an electrical steel sheet by transmission electron microscopy, size-controlled holes were artificially introduced into specimens a focused ion beam. By applying external field microscope, structures around dynamically observed Lorentz microscopy. Similar holes, but domain-wall pinning strength was found to depend on hole size. Micromagnetic analysis performed ascertain change energy during pinning.

Precise evaluation of the electrostatic potential distributions and around samples with multiple charges using electron holography has long been a problem due to unknown perturbation reference wave. Here, we report first practical application split-illumination (SIEH) tackle this problem. This method enables use non-perturbed wave distant from sample. SIEH revealed at interfaces charged particles used for development in electrophotography should lead dramatic improvements electrophotography.

Electron holography is used to visualize the electromagnetic field inside and outside a sample with high resolution. However, for analysis of nanocrystalline materials, difficulties related electron diffraction are expected arise due random orientation nanocrystallites. Here we present procedure extract magnetic information from holograms reduce effect by paying attention contrast bright-field images. As demonstration, difference in intensity flux between Fe-Si-B-P-Cu amorphous matrix...

This paper presents current research trends in advanced electron microscopy techniques for materials science. The survey is based on the special issue of Materials Transactions published October 2019 (Vol. 60, No. 10). Advanced has been applied extensively to characterize various materials. recent development and extension analyses electric fields collective motions secondary electrons by situ holography are discussed detail.

Magnetic particles with a hollow structure have arisen as an important class of nanomagnets because large pore volume and higher surface-to-volume ratio compared the same-sized solid particles. The results in unique magnetic features such enhanced surface exchange bias, spin freezing, preferential stability vortex. Despite recent growing understanding sub-100 nm spherical nanoparticles, properties larger-sized were not currently understood detail. Here, we report observations microstructures...

Abstract This study demonstrates the accumulation of electron-induced secondary electrons by utilizing a simple geometrical configuration two branches charged insulating biomaterial. The collective motion these between has been visualized analyzing reconstructed amplitude images obtained using in situ electron holography. In order to understand electrons, trajectories around have also simulated taking into account electric field on basis Maxwell’s equations.

This study proposes a method to separate the geometric phase shift due lattice strain from undesired information, resulting magnetic fields that are superposed in dark-field electron holography (DFEH) observations. Choosing distinct wave vector for Bragg reflection reversed sense of shift, while information remained unchanged. In case an Nd-Fe-B permanent magnet, once unwanted signal was removed by data processing, residual image revealed map. Even though applications DFEH have thus far been...

An alternating magnetizing system has been developed for in situ Lorentz microscopy soft magnetic materials an field. The electron trajectory the is discussed using a simulation based on simple model. It clarified that frequency and amplitude of field defocus objective mini lens can be selected as desired values. successfully applied to observation domain wall motion material, Fe(84.9)Al(5.5)Si(9.6) (wt%) (Sendust). very promising investigating interactions between walls lattice defects...

REBaCuO (RE: rare earth) bulk superconductors, whose microstructures can be controlled by quench and melt growth (QMG) processing, have a high critical current density Jc, which makes them well suited for use in practical applications. Through combination of electron holography focused ion-beam technique, we succeeded visualizing fluxon pinned an insulating particle QMG Y-Ba-Cu-O superconductor. We also clarified the magnetic flux distribution vicinity particles at different temperatures...

The accumulation and distribution of electron-induced secondary electrons around epoxy resin are studied using electron holography. is determined to be sensitive the surface conditions resin, particularly presence conductive materials on that introduced during specimen preparation processes. These results provide a deeper understanding charging discharging mechanisms for behavior these materials. This study also provides new perspective visualization various forms insulating such as through...

The magnetic field generated by a recording head is evaluated using electron holography. A head, which connected to an electric current source, set on the specimen holder of transmission microscope. Reconstructed phase images region around pole show change in distribution corresponding applied coil head. simulation field, conducted finite element method, reveals good agreement with experimental observations.

Simulations were carried out for the orbit of electron-induced secondary electrons around a charged microfibril sciatic nerve tissue. In order to set parameters simulation, shape was determined from transmission electron microscopy image, while electric potential on surface evaluated reconstructed phase image obtained with holography. On other hand, passing point and angle at amplitude image. Eventually, simulation orbits by changing kinetic energy electrons. Under given conditions, 29.6 eV...