The analysis toolbox for X-ray scattering data from layered structures
Advanced Material Analysis and Simulation Software (AMASS) provides comprehensive functionality for displaying, analyzing, simulating and fitting X-ray scattering from layered structures. It supports rocking curves, 2-axes scans, reciprocal space maps of thin heteroepitaxial layers, particularly single-crystal and highly textured thin-layer samples as well as X-ray reflectometry data and off-specular (diffuse) scattering data of arbitrary multi-layer structures. The software offers a wealth of key information, such as mismatch and relaxation, composition and layer thickness, density and roughness and more. These essential thin layer parameters are easily and quickly quantified also by the routine users.
The functionality is covered in AMASS Basic that can be extended by the HR (high-resolution) and the XRR (X-ray reflectivity) simulation and fitting option.
AMASS’s key features
AMASS Basic features all functions except for the simulation and automatic fitting.
- New intuitive graphical user interface.
- Project-oriented document format for storing, retrieving and managing all information of a work session including open scans, simulated data and all parameters set.
- Graphics for single scans, area maps and wafer maps.
- Possibility of merging 1-axis and 2-axes data sets.
- Projection and extraction from 2-axes scans to generate 1-axis scans for further analysis.
- Automatic peak search in 1-axis (such as rocking curves) and 2-axes data (such as reciprocal space maps).
- Automatic peak labelling of substrate, multiple layers and fringes.
- Materials of any space group are supported.
- Sample structures include gradients, superlattices and linked parameters.
- Software extracts strain and relaxation, mismatch and composition, substrate miscut orientation, thickness and superlattice period from labelled peak positions.
- Thickness determination from specular reflectivity data by means of Fourier and direct method.
- A wafer map can be created by the analysis of any set of scan types. This includes the direct analysis of peak parameters and from peak positions as well as automatic fitting (if the option is available).
- AMASS supports data in the XRDML format, simple ASCII format (*.asc) as well as the old Philips formats (*.dnn, *.xnn, *.ann and *ynn).
- Customizable result reporting. PDF, RTF and HTML reports supported.
- All analysis can be fully automated using a command line interface. When controlled by APP (automatic processing program) automation of the whole process from measurement to result reporting is possible.
- Choice of two fitting algorithms: enabling users to tailor the software for unique fitting requirements. (only for the options)
- Confidence analysis for each parameter of a given sample model. The result of this analysis is a measure of the reliability range of the refined parameter. (only for the options).
- HR option:
- Fits simulated rocking curves to measured data
- Layers may be partially relaxed with respect to the layer below.
- Non-polar a- and m-plane surface orientations of wurtzite structures are fully supported.
- XRR option:
- Fits simulated reflectivity curves to measured data.
- Materials in the model can include those with lattice parameter or density gradients with five choices for the gradient type.
- Three choices for the interface roughness model are available for off-specular analysis: fractal, staircase and castellation.
- Off-specular (diffuse) scattering data (omega, 2theta and offset omega/2theta scans) can be displayed and simulated. The software simulates coplanar Qx, Qz as well as non-coplanar Qx, Qy reciprocal space maps.
The extensive materials database contains materials data for use in rocking curve analysis, wafer mapping, simulation and fitting: unit cell parameters, Poisson’s ratios and single crystal stiffness coefficients for all the common cubic semiconductor materials plus hexagonal GaN, AlN and InN. In addition, it contains the elemental atomic numbers and masses, as well as their mass absorption and anomalous dispersion coefficients for different fixed X-ray wavelengths. The database is extendable through the addition of new structures and materials and values for other wavelengths.
The quick start guide (QSG) is intended to help you to use AMASS quickly and efficiently. Each of the 12 topics provides worked examples. These examples have been chosen to demonstrate the most important functionality of AMASS. Click here to download it.
- Processor: 64-bit dual or quad core @ 2.0 GHz or better
- Internal memory: 2 Gbyte (2-4 Gbytes for simultaneous analysis of many scans as in screening experiments)
- Free hard disk space: 10 Gbytes (or more) depending on the amount of data
- Monitor: super VGA monitor (17 inch or more) with a desktop area of 1024*768 pixel or more
- Current version:
- 1.0, running under all versions of Microsoft Windows from Windows 7 to Windows 10.