Characterization of Ferromagnetic Bimetallic Nanomaterials Using Electron Microscopy


Bimetallic ferromagnetic nanoparticles can be characterized using various techniques such as neutron scattering, magnetometry, electron microscopy, etc. The results from most of those techniques are from the average sample, not from individual nanoparticle. The property of nanoparticle is affected by its shape, size, chemical order, and composition. The atomic level characterization of each nanoparticle is essential and can be done by employing scanning/transmission electron microscopy (S/TEM). The use of Z-contrast imaging in STEM analysis of material permits distinguishing the atomic columns of the constituents, and the spectroscopic techniques (electron energy loss and energy-dispersive X-ray spectroscopy) allow mapping the positions of different metals and the chemical order can be seen. In addition, the magnetic property can be investigated using electron holography and Lorentz microscopy, where the change in phase information is recorded, which is directly related with the local variation in magnetic induction and the electrostatic potential.

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Characterization of Ferromagnetic Bimetallic Nanomaterials Using Electron Microscopy
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Magnetic Characterization Techniques for Nanomaterials
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  • Challa S.S.R. Kumar Send Email (1)
  • Editor Affiliation
  • 1 Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC), Rowland Institute of Science, Harvard University, Cambridge, Massachusetts, USA
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  • Nabraj Bhattarai Send Email (2)
  • Author Affiliation
  • 2 Emergent Atomic and Magnetic Structures, Division of Materials Sciences and Engineering, Ames Laboratory, Ames, IA, USA
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