Abstract
We present a novel high resolution approach for the characterization of the evolution of magnetic domain structures and magnetostrictive shifts in a Terfenol-D plate under different magnetic fields distribution using atomic force microscopy (AFM). Investigations are made to examine the magnetostrictive effect in the material under similar conditions as it is used in magnetoelectric vibration energy converters. The surface topography of the sample was imaged as it changes with induced magnetization for different relative height positions between the magnets and the plate. The magnetic field distribution was analyzed based on finite element analysis while both longitudinal and transversal magnetostrictive strains were determined based on cross sections analysis performed on the AFM topography images. In addition, AFM amplitude images are presented to visualize the evolution of magnetic domain structures. Results demonstrate that the maximum longitudinal elongation of the plate is 266ppm when it is placed just above the magnets. On the other hand, magnetostriction close to zero are observed when the sample was placed in the farthest measured position from the magnets which confirm the validity of the proposed approach.
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