Inelastic electron tunneling spectrum from surface magnon and magnetic impurity scatterings in magnetic tunnel junctions

2010 ◽  
Vol 82 (13) ◽  
Author(s):  
H.-X. Wei ◽  
Q.-H. Qin ◽  
Q.-L. Ma ◽  
X.-G. Zhang ◽  
X.-F. Han
Keyword(s):  
Magnetic Impurity ◽  
Tunnel Junctions ◽  
Electron Tunneling ◽  
Magnetic Tunnel Junctions ◽  
Inelastic Electron ◽  
Tunneling Spectrum ◽  
Inelastic Electron Tunneling

Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs

2009 ◽  
Vol 79 (17) ◽  
Author(s):  
Volker Drewello ◽  
Markus Schäfers ◽  
Oliver Schebaum ◽  
Ayaz Arif Khan ◽  
Jana Münchenberger ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Electron Tunneling ◽  
Magnetic Tunnel Junctions ◽  
Inelastic Electron ◽  
Inelastic Electron Tunneling

Molecular Degradation in the Electron Microscope: A Tunneling Spectroscopy Study

1975 ◽  
Vol 33 ◽  
pp. 244-245
Author(s):  
M. Parikh ◽  
P. K. Hansma
Keyword(s):  
Electron Microscope ◽  
Electron Tunneling ◽  
Physical Structure ◽  
Tunneling Spectroscopy ◽  
Inelastic Electron ◽  
Tunneling Spectrum ◽  
Inelastic Electron Tunneling Spectroscopy ◽  
Loss Analysis ◽  
Inelastic Electron Tunneling ◽  
Electron Tunneling Spectroscopy

Molecular degradation in the electron microscope has been studied by energy loss spectroscopy, mass loss analysis and other techniques; none of these, however, have provided explicit information about the changes in the physical structure of the molecules. Here we present results from the use of inelastic electron tunneling spectroscopy as a probe in the study of degradation of molecular specimens in an electron microscope. The technique involves including the molecules of interest in a metal-insulatormetal junction and then monitoring the junctions current-voltage (I-V) characteristic. Explicitly, the measurement of d2I/dV2 vs. V provides a spectrum of vibrational frequencies (related to IR and Raman active modes) of the molecule; thus information about molecular bonds and physical configuration can be obtained. Upon electron irradiation, changes in the molecular structure are visible as changes in the heights and positions of the peaks in the tunneling spectrum.

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