Surface Modification and Measurement Using a Scanning Tunneling Microscope With a Diamond Tip

1992 ◽  
Vol 114 (3) ◽  
pp. 493-498 ◽  
Author(s):  
D. B. Bogy
Keyword(s):  
Thin Films ◽  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Magnetic Media ◽  
Tunneling Microscopy ◽  
Tunneling Microscope ◽  
Hardness Tester ◽  
Excellent Control ◽  
Subsequent Measurement ◽  
Normal Head

Scanning Tunneling Microscopy is used to modify and measure the surface of magnetic media disks. A very rugged diamond tip allows continued scanning after it has severely scratched or punched the surface. Three techniques are used. First a manual method of penetrating the surface using a stand-alone head makes a scratch of essentially uncontrollable length and depth. Then the normal head is used to cause surface penetration by removing the bias voltage while scanning. Better control is obtained as regards the location and depth of the indentation. Excellent control of indentation location and depth can be obtained by using a new software developed by the STM manufacturer to push the tip into the surface with the piezoelectric scanner. The control of the indentations and their subsequent measurement may make the STM a useful tool as a hardness tester for ultra-thin films, on the order of a few tens of nanometers.

Scanning tunneling microscopy of E. coli RNA polymerase deposited onto an Au substrate by an electrochemical process

1991 ◽  
Vol 49 ◽  
pp. 378-379
Author(s):  
Rebecca W. Keller ◽  
Carlos Bustamante ◽  
David Bear
Keyword(s):  
Scanning Tunneling Microscope ◽  
Biological Sample ◽  
Substrate Surface ◽  
Electrochemical Process ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Tunneling Microscope ◽  
E Coli ◽  
Preparation Techniques

Under ideal conditions, the Scanning Tunneling Microscope (STM) can create atomic resolution images of different kinds of samples. The STM can also be operated in a variety of non-vacuum environments. Because of its potentially high resolution and flexibility of operation, it is now being applied to image biological systems. Several groups have communicated the imaging of double and single stranded DNA.However, reproducibility is still the main problem with most STM results on biological samples. One source of irreproducibility is unreliable sample preparation techniques. Traditional deposition methods used in electron microscopy, such as glow discharge and spreading techniques, do not appear to work with STM. It seems that these techniques do not fix the biological sample strongly enough to the substrate surface. There is now evidence that there are strong forces between the STM tip and the sample and, unless the sample is strongly bound to the surface, it can be swept aside by the tip.

scholarly journals A 350 mK, 9 T scanning tunneling microscope for the study of superconducting thin films on insulating substrates and single crystals

2013 ◽  
Vol 84 (12) ◽  
pp. 123905 ◽  
Author(s):  
Anand Kamlapure ◽  
Garima Saraswat ◽  
Somesh Chandra Ganguli ◽  
Vivas Bagwe ◽  
Pratap Raychaudhuri ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystals ◽  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Superconducting Thin Films ◽  
Tunneling Microscope ◽  
Insulating Substrates

Spin-Polarized Scanning Tunneling Microscopy (SPSTM)

1991 ◽  
Vol 231 ◽  
Author(s):  
R. Wiesendanger ◽  
D. Buergler ◽  
G. Tarrach ◽  
I.V. Shvets ◽  
H.-J. Guentherodt
Keyword(s):  
Scanning Tunneling Microscope ◽  
High Spatial Resolution ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Promising Technique ◽  
Polarized Electrons ◽  
Tunneling Microscope ◽  
Magnetic Structures ◽  
Spin Polarized

AbstractWe report on a novel promising technique for the investigation of magnetic structures at surfaces at high spatial resolution, ultimately down to the atomic scale. This technique is based on the observation of vacuum tunneling of spin-polarized electrons by means of a scanning tunneling microscope (STM). We discuss appropriate probe tips for the spin-polarized STM (SPSTM) and describe initial experimental results. We further focus on the information obtained by SPSTM. Finally, the perspectives of SPSTM will be discussed.

Approaching microtubule structure with the scanning tunneling microscope (STM)

1994 ◽  
Vol 107 (11) ◽  
pp. 3127-3131
Author(s):  
M. Maaloum ◽  
D. Chretien ◽  
E. Karsenti ◽  
J.K. Horber
Keyword(s):  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Close Inspection ◽  
Tunneling Microscope ◽  
X Ray ◽  
Macromolecular Assemblies ◽  
Left Handed ◽  
X Ray Scattering ◽  
Type Lattice

We demonstrate that the scanning tunneling microscope can be used to obtain information about arrangement of tubulin subunits in the microtubule wall. Long rows of subunits with a periodicity of 3.8 +/- 0.4 nm were clearly visible in the images of microtubules. The separation between the rows of subunits was 4.8 +/- 0.4 nm. Close inspection of two images revealed another periodicity of 7.8 +/- 0.4 nm in the contour levels of the protofilaments. This indicates that alpha and beta tubulin monomers can be resolved. In these areas the monomers were arranged according to a ‘B-type’ lattice. Scanning tunneling microscope images confirm that the lateral contacts between tubulin monomers in adjacent protofilaments are compatible with a three-start, left-handed helix model. This study demonstrates that scanning tunneling microscopy can give direct information on the structure and organization of macromolecular assemblies and can complement the classical methods of electron microscopy and X-ray scattering.

NANOSCALE CHARACTERIZATION BY SCANNING TUNNELING MICROSCOPY

COSMOS ◽  
2007 ◽  
Vol 03 (01) ◽  
pp. 23-50 ◽  
Author(s):  
HAI XU ◽  
XIAN NING XIE ◽  
M. A. K. ZILANI ◽  
WEI CHEN ◽  
ANDREW THYE SHEN WEE
Keyword(s):  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Preparation Methods ◽  
New Developments ◽  
Tunneling Microscope ◽  
Spin Polarized ◽  
Nanoscale Characterization ◽  
Working Principle ◽  
Operational Modes

Nanoscale characterization is a key field in nanoscience and technology as it provides fundamental understanding of the properties and functionalities of materials down to the atomic and molecular scale. In this article, we review the development and application of scanning tunneling microscope (STM) techniques in nanoscale characterization. We will discuss the working principle, experimental setup, operational modes, and tip preparation methods of scanning tunneling microscope. Selected examples are provided to illustrate the application of STM in the nanocharacterization of semiconductors. In addition, new developments in STM techniques including spin-polarized STM (SP-STM) and multi-probe STM (MP-STM) are discussed in comparison with conventional non-magnetic and single tip STM methods.

$\sqrt 3 \times \sqrt 3 $ RECONSTRUCTIONS OF Si(111) STUDIED BY SCANNING TUNNELING MICROSCOPY

1994 ◽  
Vol 01 (02n03) ◽  
pp. 395-410 ◽  
Author(s):  
JUN NOGAMI
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Surface Structure ◽  
Scanning Tunneling Microscope ◽  
Current Understanding ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Tunneling Microscope ◽  
Atomic Structures

Many different metals induce [Formula: see text] R30° reconstructions of the Si(111) surface. Although these surfaces share a common periodicity, they can have very different atomic structures. This paper discusses scanning tunneling microscope results and their relationship to the current understanding of the [Formula: see text] surface structure in several of these metal/Si(111) systems.

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