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Determination of deformation fields by atomic force acoustic microscopy

: Bendjus, B.; Köhler, B.; Heuer, H.; Rabe, U.; Striegler, A.


Geer, R.E. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Testing, reliability, and application of micro- and nano-material systems IV : 28 February - 2 March 2006, San Diego, California, USA
Bellingham/Wash.: SPIE, 2006 (SPIE Proceedings Series 6175)
ISBN: 0-8194-6228-4
Paper 617509
Conference "Testing, Reliability, and Application of Micro- and Nano-Material Systems" <4, 2006, San Diego/Calif.>
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()
Fraunhofer IZFP ()
deformation field; Atomic Force Acoustic Microscopy; local elastic response; Ultrasonic Force Microscopy (UFM)

Advanced Scanning Probe Microscopy techniques combine Atomic Force Microscopy (AFM) with ultrasound. Atomic
Force Acoustic Microscopy (AFAM) and Ultrasonic Force Microscopy (UFM) become increasingly powerful tools for
the determination of material properties on nanoscale. AFAM is mainly applied to the analysis of materials with elastic properties locally varying on micro- and nanoscale. Deformation fields and buried structures can be visualized. In AFAM, flexural and torsional cantilever vibrations are excited by out-of-plane and in-plane sample surface vibrations. The ultrasound is transmitted from the sample into the cantilever while forces act between sensor tip and sample. The sample surface is scanned by the sensor, and an ultrasonic image is acquired simultaneously to the topography image.
The contrast comprehended in the ultrasonic image depends on surface topography and on the local elastic and adhesive properties of the sample. Voids, inclusions, or cracks, which build up regions of different elastic constants in the interior of the material, are sensed by the local elastic response of the tip. As a consequence, information on hidden structures can be derived from the acoustic images. Usually, this subsurface information is overlaid by additional topographic information, also contained in the ultrasonic image. Here, an AFAM set up is combined with tensile and bending modules. This approach allows generation of static deformation fields on surfaces and in-situ imaging and analysis of these fields in the AFM or AFAM. A software module for micro deformation analysis by means of correlation based algorithms (MicroDAC) is used to determine the local surface deformation quantitatively.