Eletron Holography of Advanced Nanomaterials
Eletron holography of Advanced Nanomaterials
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By utilizing a field emission gun and a biprism installed on a transmission electron microscope (TEM),electron holography is extensively carried out to visualize the electric and magnetic fields of nanomaterials. Inthe electric field analysis, the distribution of electric potential in a sharp tip made of W coated with ZrO2 isvisualized by applying the voltage to the tip. Denser contour lines due to the electric potential are observedwith an increase in the bias voltage. In the magnetic field analysis by producing the strong magnetic field witha sharp magnetic needle made of a permanent magnet, the in situexperiment is carried out to investigate themagnetization of hard magnetic materials. The results of these experiments clearly demonstrate that electronholography is a promising advanced transmission electron microscopy technique to characterize the electricand magnetic properties of nanomaterials.
Abstract
By utilizing a field emission gun and a biprism installed on a transmission electron microscope (TEM),electron holography is extensively carried out to visualize the electric and magnetic fields of nanomaterials. Inthe electric field analysis, the distribution of electric potential in a sharp tip made of W coated with ZrO2 isvisualized by applying the voltage to the tip. Denser contour lines due to the electric potential are observedwith an increase in the bias voltage. In the magnetic field analysis by producing the strong magnetic field witha sharp magnetic needle made of a permanent magnet, the in situexperiment is carried out to investigate themagnetization of hard magnetic materials. The results of these experiments clearly demonstrate that electronholography is a promising advanced transmission electron microscopy technique to characterize the electricand magnetic properties of nanomaterials.