scholarly journals Wide range local resistance imaging on fragile materials by conducting probe atomic force microscopy in intermittent contact mode

2016 ◽  
Vol 108 (24) ◽  
pp. 243101 ◽  
Author(s):  
Aymeric Vecchiola ◽  
Pascal Chrétien ◽  
Sophie Delprat ◽  
Karim Bouzehouane ◽  
Olivier Schneegans ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Local Resistance ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Wide Range ◽  
Intermittent Contact

scholarly journals Current measurements in the intermittent-contact mode of atomic force microscopy using the Fourier method: a feasibility analysis

2020 ◽  
Vol 11 ◽  
pp. 453-465 ◽  
Author(s):  
Berkin Uluutku ◽  
Santiago D Solares
Keyword(s):  
Atomic Force Microscopy ◽  
Electrical Potential ◽  
Current Response ◽  
Contact Mode ◽  
Higher Harmonics ◽  
Conductive Afm ◽  
Force Microscopy ◽  
Atomic Force ◽  
Static Contact ◽  
Intermittent Contact

Atomic force microscopy (AFM) is an important tool for measuring a variety of nanoscale surface properties, such as topography, viscoelasticity, electrical potential and conductivity. Some of these properties are measured using contact methods (static contact or intermittent contact), while others are measured using noncontact methods. Some properties can be measured using different approaches. Conductivity, in particular, is mapped using the contact-mode method. However, this modality can be destructive to delicate samples, since it involves continuously dragging the cantilever tip on the surface during the raster scan, while a constant tip–sample force is applied. In this paper we discuss a possible approach to develop an intermittent-contact conductive AFM mode based on Fourier analysis, whereby the measured current response consists of higher harmonics of the cantilever oscillation frequency. Such an approach may enable the characterization of soft samples with less damage than contact-mode imaging. To explore its feasibility, we derive the analytical form of the tip–sample current that would be obtained for attractive (noncontact) and repulsive (intermittent-contact) dynamic AFM characterization, and compare it with results obtained from numerical simulations. Although significant instrumentation challenges are anticipated, the modelling results are promising and suggest that Fourier-based higher-harmonics current measurement may enable the development of a reliable intermittent-contact conductive AFM method.

scholarly journals Choosing a Cantilever for In Situ Atomic Force Microscopy

2003 ◽  
Vol 11 (2) ◽  
pp. 42-43
Author(s):  
John T. Woodward
Keyword(s):  
Biological Sciences ◽  
Atomic Force Microscopy ◽  
Biological Samples ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging ◽  
Interesting Discussion ◽  
Intermittent Contact

What is the best cantilever for intermittent contact mode (often called Tapping Mode™) atomic force microscope (AFM) imaging under water? This is a question I hear often and one that recently generated some interesting discussion on an AFM newsgroup (more on the newsgroup below). The ability of the AFM to image samples En physiologically relevant environments has made it a popular technique in the biological sciences. However, because scanning the AFM tip in contact mode easily perturbs many biological samples, it was the advent of intermittent contact modes that lead to AFM's widespread use in biology.

III–V SEMICONDUCTOR SURFACE NANOPATTERNING USING ATOMIC FORCE MICROSCOPY FOR InAs QUANTUM DOT LOCALIZATION

2007 ◽  
Vol 06 (05) ◽  
pp. 345-348
Author(s):  
E. TRANVOUEZ ◽  
A. DESCAMPS ◽  
G. BREMOND ◽  
A. TURALA ◽  
P. REGRENY ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Quantum Dot ◽  
Semiconductor Surface ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
First Results ◽  
Lateral Growth Rate ◽  
Intermittent Contact ◽  
Inas Quantum Dot

In order to create suitable nanoholes for quantum dot (QD) localization on InP and GaAs surfaces, we used atomic force microscopy in an intermittent contact mode coupled with a modulated voltage to realized local anodization at a nanometer scale. This method leads, after a few tens of milliseconds of oxidation, to an oxide height saturation and a low lateral growth rate for both surfaces. These specific results were used to control separately both the depth and the diameter of holes and to obtain compatible pattern for QD growth. We also demonstrated the thermal stability of these patterns at compatible temperatures with the InAs QD growth. First, results of QD growth on these patterns are presented.

Multifrequency Atomic Force Microscopy: Compositional Imaging with Electrostatic Force Measurements

2011 ◽  
Vol 17 (4) ◽  
pp. 587-597 ◽  
Author(s):  
Sergei Magonov ◽  
John Alexander
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Potential ◽  
Electrostatic Interactions ◽  
Electrostatic Force ◽  
Contact Mode ◽  
Organic Layers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Intermittent Contact ◽  
Multicomponent Polymer

AbstractWe demonstrate that single-pass Kelvin force microscopy (KFM) and dC/dz measurements in different environments expand the compositional imaging with atomic force microscopy. The KFM and dC/dz studies were performed in the intermittent contact mode with force gradient detection of tip-sample electrostatic interactions. Both factors contribute to sensitive measurements of the surface potential and capacitance gradient with nanometer-scale spatial resolution as it was verified on a broad range of materials: metal alloys, polymers, organic layers, and liquid-like objects. For many samples the surface potential and dC/dz variations complement each other in identification of individual components of heterogeneous materials. In situ imaging in different humidity or vapors of various organic solvents further facilitate recognition of the constituents of multicomponent polymer samples due to selective swelling of components.

Confinement Effects of Hard Disk Lubricant Investigation by Atomic Force Microscopy

2007 ◽  
Vol 1025 ◽  
Author(s):  
George L Caia ◽  
Cynthia Buenviaje-Coggins ◽  
Nicole Munoz ◽  
David Faddis ◽  
Doru I Florescu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Adhesion Force ◽  
Confinement Effects ◽  
Hard Drives ◽  
Force Microscopy ◽  
Critical Design ◽  
Atomic Force ◽  
Wide Range ◽  
Disk Lubricant ◽  
Intermittent Contact

AbstractAs the critical design requirements decrease, we need to understand how confinement affects the performance of the materials we use. One example of this occurs with the lubricant used on magnetic recording disks to reduce wear between the disk and head reader during unexpected intermittent contact. Lubricants for use in hard drives need to have sufficient reflow and redistribution properties which are stable in a wide range of temperatures experienced in today's hard drive. Since the material properties of the confined system often differ from the bulk properties, the tools needed to properly investigate these systems need to be developed and understood. In this study, we utilized atomic force microscopy (AFM) techniques, to study the confinement effects on lubricant stability with temperature. Our studies have demonstrated distinct changes in adhesion force with changes in the thickness of the confining substrate layer. As adhesion is a component of friction, these changes in adhesion are directly related to lubricant performance and its ability to reduce wear between disk and reader.

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