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Single-crystal magnetotunnel junctions

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


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.

DOI: 10.1063/1.1342778
Zitationen: 117
Web of Science
Zitationen: 105
Zitationen: 116
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2001
Sprache Englisch
Identifikator ISSN: 0003-6951
KITopen-ID: 1000053858
Erschienen in Applied Physics Letters
Verlag American Institute of Physics (AIP)
Band 78
Heft 4
Seiten 509-511
Nachgewiesen in Dimensions
Web of Science
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