Abstracts Book - IMRC 2018

• SD5-P001
ELECTRON HOLOGRAPHY OF POROUS SPHERICAL MAGNETITE
NANOSTRUCTURES
Diana Aracely Vazquez Vargas 1 , Arturo Ponce Pedraza 2 , Blanca Monárrez Cordero 1 , Patricia
Amézaga Madrid 1 , Mario Miki Yoshida 1
1 Centro de Investigación en Materiales Avanzados, S.C., Physics of materials, Mexico.
2 University of Texas at San Antonio, Physics and Astronomy, United States.
Due to the fact that images and diffraction patterns in an electron microscope
only record intensities, and because the interaction of beam’s electrons with the
electric and magnetic fields of the sample modulates the phases more than it
changes the amplitudes of the electron waves, a considerable amount of
information of the sample is lost [1]. Electron Holography translates the phase
into intensity variations that is recordable in the microscope. This work reports
the analysis of the magnetic induction inside of porous spherical magnetite
nanostructures by electron holography. The porous spherical magnetite
nanostructures were synthesized by aerosol assisted CVD inside of a tubular
reactor at 723 K, using a 0.05 mol L-1 precursor solution of Fe (II) chloride in
methanol, details of experimental set up and synthesis conditions was
previously reported [2]. Overall morphology, elemental composition, crystalline
structure were analyzed by scanning and transmission electron microscopy. In
order to split the magnetic field contribution to the phase modulation of the
electron wave, two different acceleration voltages (200 kV and 120 kV) were
utilized to subtract the electric field contribution. Reconstruction of image wave
or object exit wave was performed using Digital Micrograph Holoworks
software. In this process the two-dimensional Fourier transform of the
hologram intensity is calculated, then taking the inverse Fourier transform of a
selected off-axis portion of this transform the phase and amplitude of the object
exit wave can be calculated.
[1] Electron Holography Ch. 8 in C. B. Carter, D. B. Williams (Eds.), Transmission
Electron Microscopy, Springer International Publishing Switzerland 2016. DOI
10.1007/978-3-319-26651-0_8.
[2] B. Monárrez-Cordero et al. Journal of Alloys and Compounds 586 (2014)
S520–S525
Keywords: Electron, Holography, Nanostructures
Presenting authors email: diana_vazquez11@hotmail.com