High-resolution electron holography for the study of composition and strain in thin film semiconductors

2006 ◽  
Vol 135 (3) ◽  
pp. 188-191 ◽  
Author(s):  
F. Houdellier ◽  
M.J. Hÿtch ◽  
E. Snoeck ◽  
M.J. Casanove
Keyword(s):  
Thin Film ◽  
High Resolution ◽  
Electron Holography ◽  
Resolution Electron ◽  
Thin Film Semiconductors

Design of a Field-Emission Gun for the Phillips CM20/STEM microscope

1990 ◽  
Vol 48 (2) ◽  
pp. 100-101
Author(s):  
P.M. Mul ◽  
B.J.M. Bormans ◽  
L. Schaap
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Analytical Electron Microscopy ◽  
Emission Region ◽  
Attractive Alternative ◽  
Electron Holography ◽  
Field Emitter ◽  
Field Emitters ◽  
Resolution Electron ◽  
High Resolution Tem

The first Field Emission Guns (FEG) on TEM/STEM instruments were introduced by Philips in 1977. In the past decade these EM400-series microscopes have been very successful, especially in analytical electron microscopy, where the high currents in small probes are particularly suitable. In High Resolution Electron Holography, the high coherence of the FEG has made it possible to approach atomic resolution.Most of these TEM/STEM systems are based on a cold field emitter (CFE). There are, however, a number of disadvantages to CFE’s, because of their very small emission region: the maximum current is limited (a strong disadvantage for high-resolution TEM imaging) and the emission is unstable, requiring special measures to reduce the strong FEG-induced noise. Thermal field emitters (TFE), i.e. a zirconiated field emitter source operating in the thermal or Schottky mode, have been shown to be a viable and attractive alternative to CFE’s. TFE’s have larger emission regions, providing much higher maximum currents, better stability, and reduced sensitivity to vacuum conditions as well as mechanical and electrical interferences.

Study of the growth mechanism of highly in-plane aligned α-axis YBa2Cu3O7−x thin films on LaSrGaO4 substrate by high resolution electron microscopy

1996 ◽  
Vol 11 (12) ◽  
pp. 2951-2954 ◽  
Author(s):  
J. G. Wen ◽  
S. Mahajan ◽  
H. Ohtsuka ◽  
T. Morishita ◽  
N. Koshizuka
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Cross Sectional ◽  
Plan View ◽  
Oriented Film ◽  
Resolution Electron ◽  
Average Size

Highly in-plane aligned α-axis YBa2Cu3O7−x thin films deposited on (100) LaSrGaO4 substrates by a self-template method were studied by high-resolution electron microscopy along three orthogonal 〈100〉 axes of the substrate. Plan-view images confirm that the majority of the film preferentially aligns across the entire substrate except for very few misaligned domains with average size 10 nm2. Cross-sectional images along the [100] orientation of YBa2Cu3O7−x reveal that in-plane aligned α-axis YBa2Cu3O7−x is grown on a template layer dominated by c-axis oriented film. This strongly suggests that the in-plane alignment of α-axis YBa2Cu3O7−x thin films on (100) LaSrGaO4 substrates is governed by the different stresses along the b and c axes of the substrate. Cross-sectional images along [001] of the YBa2Cu3O7—x thin film reveal that the 90° domains easily nucleate in the region between α-axis YBa2Cu3O7—x and the YBa4Cu3Ox phase. Cracks along the (001) plane of YBa2Cu3O7−x are found to be due to the large mismatch between the c parameters of the thin film and substrate.

Investigation of biogenic magnetite particles by high-resolution electron microscope

1984 ◽  
Vol 42 ◽  
pp. 216-217
Author(s):  
T. Matsuda ◽  
J. Endo ◽  
N. Osakabe ◽  
A. Tonomura ◽  
T. Arii
Keyword(s):  
High Resolution ◽  
Permanent Magnets ◽  
Fine Particles ◽  
Electron Holography ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Water Pond ◽  
High Resolution Electron Microscope ◽  
Magnetite Particles ◽  
Mössbauer Analysis

In 1975, Blakemore found aquatic bacteria that swim along earth's magnetic lines of force [1]. They have permanent magnets of iron-rich fine particles within them. Such particles were found by Mössbauer analysis to consist of magnetite in the case of magnetospirilla [2]. In addition, Towe et al confirmed by electron diffraction that the particles were crystalline [3]. The purpose of the present investigation is to determine the crystal and magnetic structure of these particles by both high-resolution lattice imaging and electron holography; however only the former is reported here.Magnetotactic bacteria were gathered in a fresh-water pond. The specimens were peanut-shaped, and approximately 3um in length. Transmission electron micrographs, such as that shown in Fig. 1, reveal that approximately 30 fine particles are aligned within each bacterium.

Digital imaging for high-resolution electron holography

1992 ◽  
Vol 50 (2) ◽  
pp. 944-945
Author(s):  
L. F. Allard ◽  
T. A. Nolan ◽  
D. C. Joy ◽  
T. Hashimoto
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Digital Imaging ◽  
Electron Holography ◽  
Digital Recording ◽  
Original Image ◽  
Ccd Array ◽  
Resolution Electron ◽  
Phase Images ◽  
High Resolution Images

It is a goal of electron microscopy to eliminate film as the recording medium for electron microscope images in favor of direct digital recording. At present, there are commercially available digital TV systems (e.g. ref. [2]) based on CCD slow scan technology that provide 1M pixel images (i.e. 1k × 1k arrays). Such systems have proven useful for recording standard high resolution images and are sufficient to replace film for most standard electron microscopy. However, the newly developing technique of electron holography requires an advanced digital imaging capability, because the process of reconstruction of amplitude and phase images from a hologram necessarily gives final images that are only one-quarter the size of the original image. For a minimum desired 512 × 512 pixel reconstructed image, the original image should be 2k × 2k, requiring a CCD array with 4M pixels.Electron holograms which are recorded for reconstruction of aberration-corrected images with improved resolution (approaching 0.1 nm) require hologram fringes spaced on the order of 0.3 nm.

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