Exchange-field penetration into a tunnel barrier: Spin selection in electron tunneling from a paramagnet to a ferromagnet

1992 ◽  
Vol 45 (6) ◽  
pp. 3117-3118 ◽  
Author(s):  
N. Garca ◽  
A. Hernando
Keyword(s):  
Electron Tunneling ◽  
Tunnel Barrier ◽  
Exchange Field ◽  
Field Penetration

Exchange field penetration in Fe73.5Cu1Mo3Si12.5Al1B9 alloy

2007 ◽  
Vol 438 (1-2) ◽  
pp. 15-20 ◽  
Author(s):  
D. Prabhu ◽  
A. Narayanasamy ◽  
K. Ganesan ◽  
N. Ponpandian ◽  
K. Chattopadhyay
Keyword(s):  
Exchange Field ◽  
Field Penetration

scholarly journals Electron tunneling properties of Al2O3 tunnel barrier made using atomic layer deposition in multilayer devices

AIP Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 025018 ◽  
Author(s):  
Ryan Goul ◽  
Jamie Wilt ◽  
Jagaran Acharya ◽  
Bo Liu ◽  
Dan Ewing ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Electron Tunneling ◽  
Atomic Layer ◽  
Tunnel Barrier ◽  
Layer Deposition

Model of exchange-field penetration in nanocrystallineFe87Zr6B6Cualloys from magnetic and Mössbauer studies

1998 ◽  
Vol 58 (18) ◽  
pp. 12147-12158 ◽  
Author(s):  
J. S. Garitaonandia ◽  
D. S. Schmool ◽  
J. M. Barandiarán
Keyword(s):  
Exchange Field ◽  
Mössbauer Studies ◽  
Field Penetration

A TEM study of electron tunneling in biological macromolecules

1987 ◽  
Vol 45 ◽  
pp. 140-141
Author(s):  
J. A. Panitz
Keyword(s):  
Stark Effect ◽  
Electron Tunneling ◽  
Imaging Modality ◽  
Tunneling Current ◽  
Biological Species ◽  
Scanning Tunneling ◽  
Biological Macromolecules ◽  
Flat Surfaces ◽  
Virus Particles ◽  
Stm Images

Tunneling is a ubiquitous phenomenon. Alpha particle disintegration, the Stark effect, superconductivity in thin films, field-emission, and field-ionization are examples of electron tunneling phenomena. In the scanning tunneling microscope (STM) electron tunneling is used as an imaging modality. STM images of flat surfaces show structure at the atomic level. However, STM images of large biological species deposited onto flat surfaces are disappointing. For example, unstained virus particles imaged in the STM do not resemble their TEM counterparts.It is not clear how an STM image of a biological species is formed. Most biological species are large compared to the nominal electrode separation of ∼ 1nm that is required for electron tunneling. To form an image of a biological species, the tunneling electrodes must be separated by a distance that would normally be too large for a tunneling current to be observed.

Field-assisted ionization theory for microscopists

1994 ◽  
Vol 52 ◽  
pp. 820-821
Author(s):  
Patrick P. Camus
Keyword(s):  
Electric Field ◽  
Electron Tunneling ◽  
Ionization Probability ◽  
Critical Distance ◽  
Tunneling Probability ◽  
Field Ionization ◽  
Radius Of Curvature ◽  
Field Evaporation ◽  
A Value ◽  
Ion Emission

The theory of field ion emission is the study of electron tunneling probability enhanced by the application of a high electric field. At subnanometer distances and kilovolt potentials, the probability of tunneling of electrons increases markedly. Field ionization of gas atoms produce atomic resolution images of the surface of the specimen, while field evaporation of surface atoms sections the specimen. Details of emission theory may be found in monographs.Field ionization (FI) is the phenomena whereby an electric field assists in the ionization of gas atoms via tunneling. The tunneling probability is a maximum at a critical distance above the surface,xc, Fig. 1. Energy is required to ionize the gas atom at xc, I, but at a value reduced by the appliedelectric field, xcFe, while energy is recovered by placing the electron in the specimen, φ. The highest ionization probability occurs for those regions on the specimen that have the highest local electric field. Those atoms which protrude from the average surfacehave the smallest radius of curvature, the highest field and therefore produce the highest ionizationprobability and brightest spots on the imaging screen, Fig. 2. This technique is called field ion microscopy (FIM).

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