Volume 53, Number 5, March 2001
|Page(s)||625 - 631|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Current hysteresis due to changes in magnetization of magnetic tunnel junctions by spin-polarized current
Institute of Radio-Engineering & Electronics, Russian Academy of
Sciences Fryazino, Vvedenskii Sq. 1, Moscow Region 141120, Russia
2 University of Oxford, Department of Physics, Theoretical Physics 1 Keble Road, Oxford OX1 3NP, UK
3 Institute of Crystallography, Russian Academy of Sciences Leninskii Pr. 59, 117333 Moscow, Russia
4 Department of Physics, New York University 4 Washington Place, New York, NY 10003, USA
5 Institute of Macromolecular Compounds, Russian Academy of Sciences Bolshoy Pr. 31, 199004 St. Petersburg, Russia
Accepted: 15 December 2000
We measured the current-voltage characteristics of magnetic tunnel junctions using novel dielectric materials -diamond-like carbon and polyimide barriers-which have a well-controlled chemical composition. For most of our as grown samples we observed hysteresis loops which were independent of the barrier material chosen. Their non-reproducible shape was dependent on bias and external field. We ascribe the hysteresis to the existence of a dynamic change in the domain magnetization of the electrodes due to a feed-back mechanism between the tunnel current and the magnetic structure. In an external magnetic field the hysteresis loops vanish, and the current-voltage characteristics are reproducible.
PACS: 73.40.Rw – Metal-insulator-metal structures / 73.40.Gk – Tunneling / 75.60.-d – Domain effects, magnetization curves, and hysteresis
© EDP Sciences, 2001
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