BRR - A SEM-AFM integration for Zeiss scanning electron microscope
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Video in higher resolution

The BRR is an unification of a scanning electron microscope and an atomic force microscope.
It unites the best properties of both worlds without making performance compromises for both components. In addition, the new system has more advantages than the single systems.

This system built by DME is a SEM-AFM Integration for MERLIN® Electron Microscope and AURIGA® Crossbeam Workstation. A retrofitting of existing systems is also possible at any time.

The following properties make the microscope a worldwide unique system:
The world seen by SEM-AFM

Why build a combined SEM-AFM? A combined SEM-AFM has a number of advantages in comparison to the two systems as stand alone.
The system offers new possibilities for measuring surfaces and nano structures. The combination of SEM and AFM offers an exact positioning of the AFM tip. The AFM gives you precise information about topography, electrical and mechanical properties of the surface.

Some more measurements you can watch in our videos and applications.

You can read more advantages of the combined system in our article SEM and AFM – high resolution with overview.

Hardware Integration

Our approach to realize a combined SEM-SPM system is based on the integration of a vacuum compatible SPM into existing SEM systems. This combination was selected to reach the highest performance and usability of the system. Another benefit of this strategy is that existing SEM systems can be upgraded to a combined SEM-SPM system. In both cases, the SEM will be not limited in its function so that combined SEM/SPM measurements are possible.

Laserpfad
Laser path

The SPM for integration is designed as a sample scanner. This design enables alignment the electron beam and the SPM tip with the highest precision, because the beam and tip are not moved against each other. Even during SPM scanning, this enables unknown possibilities of combined measurements. Additionally, highest performance in terms of resolution and frame rate can be achieved by this setup. The scan unit itself is the next developmental step of our STM scanner, known for high stability and reliance in the last decades. With a scan volume of 9 µm x 9 µm x 1 µm and a possible sample size of 10 mm, the design claim for high resolution is clearly visible. Electronic components like the laser diode, the detector, and preamplifier are located inside the vacuum chamber in hermetically encapsulated compartments. The alignment of the laser path and also the exchange of the cantilever and the sample can be performed without breaking the vacuum. The positioning of the SPM in respect to the SEM and positioning the SPM tip to the area of interest can be realized by remote control. With a small number of changes to the SPM, a UHV compatible version is available.

AFM Rotation

The system is realized as an integration of the DME developed SPM into a ZEISS AURIGA System. In this system, SEM, FIB, and SPM will be united and can be performed in combined measurements. The SPM is mounted to a specially designed stage which enables vertical and rotational movement. This stage is part of the main door of the AFM (see figure on the left). In this setup, the SPM tip can be aligned with the FIB e-beam cross point and rotated around it in an angle of about 75°. This enables the operator to either align the e-beam or the FIB perpendicular to the sample surface. The rotation of the whole SPM opens the possibility of working with commercially available Si and SiN SPM probes, because it is possible to observe the tip with the SEM from a sidewards angle (see Fig on the right). With a free field of view for the SEM, the SPM tip can be positioned to the area of interest under total observation by SEM with nm precision. From a view position perpendicular to the sample, the view on SPM tip is blocked by the cantilever itself. The SPM the tip can be positioned to the area of interest under total observation by SEM.

Software Integration

The grade of functionality of highly complex scientific instruments like the SEM-AFM, depends on the operating software. To achieve the seamless integration of the to methods, a single software user interface is a must. The open design of our SPM Software ScanTool™ enables us to integrate a self designed SEM operating software. So the operator is able to control both systems from one and the same software without clicking through a labyrinth of tabs and windows. The view on all settings and image data of both methods is unblocked and accessible. The software is designed for highest work flow and throughput. At the same time, program functions like the DME Automator gives access to all functions of the BRR™SEM-AFM system, so that user designed advanced measurement routines can be designed and performed. So it is possible to create automatically running measurement routines for the acquisition of comparable data from different regions of the sample. Image data from SEM and SPM are analyzed in the ScanTool™ software. Standard analyzing tools are available, more advanced or specialized analysis procedures can be selfimplemented or implemented by us on customer demand by the use of the "DME Automator" or "DME Image Calculator".

SEM AFM ScanTool Software