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Single-crystal magnetotunnel junctions

Wulfhekel, W.; Klaua, M.; Ullmann, D.; Zavaliche, F.; Kirschner, J.; Urban, R.; Monchesky, T.; Heinrich, B.

Abstract: We have grown epitaxial single-crystal magnetotunnel junctions using Fe(001) substrates, MgO(001) spacers and Fe top electrodes. We have used scanning tunneling microscopy and atomic force microscopy to measure the tunneling characteristics as a function of position and demonstrated that local tunneling can be obtained such that the buried MgO can be characterized with nm resolution. Local I(V) curves revealed that most of the area had intrinsic tunneling properties corresponding to the proper MgO tunneling barrier. A small fraction of the scanned areas showed localized spikes in the tunneling current which are most likely caused by defects in the MgO. (C) 2001 American Institute of Physics.

Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2001
Sprache Englisch
Identifikator DOI: 10.1063/1.1342778
ISSN: 0003-6951
KITopen ID: 1000053858
Erschienen in Applied Physics Letters
Band 78
Heft 4
Seiten 509-511
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