Document Detail

Analytical investigations of tunnel magnetoresistance layers.
MedLine Citation:
PMID:  15085318     Owner:  NLM     Status:  MEDLINE    
The basic elements of tunnel magnetoresists are two magnetic layers separated by an insulating barrier layer. The uniformity of this only 1-2 nm thick barrier layer up to dot edges and the chemical composition of the layers are properties important for the efficiency of tunnel magnetoresistance devices. These key-properties have been investigated by analytical TEM methods like high resolution TEM imaging and energy-filtered imaging. With regard to the chemical composition the TEM results have been confirmed by XPS investigations. The subsequent oxidation of the barrier is one of the most critical steps of the deposition procedure of the layer stacks. An undersized oxygen dose leads to an incomplete oxidation of the barrier layer with uncontrollable tunnel behaviour. An overdose of oxygen leads to oxygen diffusion in the layers beneath the barrier and uncontrollable magnetic hardness of the lower magnetic electrode.
Jürgen Thomas; Rainer Reiche; Hartmut Vinzelberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-04-14
Journal Detail:
Title:  Analytical and bioanalytical chemistry     Volume:  379     ISSN:  1618-2642     ISO Abbreviation:  Anal Bioanal Chem     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-06-28     Completed Date:  2005-05-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101134327     Medline TA:  Anal Bioanal Chem     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  576-81     Citation Subset:  IM    
Leibniz-Institut für Festkörper- und Werkstoffforschung, PF 27 01 16, 01171 Dresden, Germany.
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MeSH Terms
Alloys / chemistry
Aluminum Oxide / chemistry
Cobalt / chemistry
Magnetics / instrumentation*
Materials Testing
Microscopy, Electron, Transmission / methods
Oxygen / chemistry
Spectrometry, X-Ray Emission / methods
Surface Properties
Reg. No./Substance:
0/Alloys; 1344-28-1/Aluminum Oxide; 7440-48-4/Cobalt; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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