Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-09-18
Appl. Phys. Lett. 87, 042501 (2005)
Physics
Condensed Matter
Other Condensed Matter
9 pages and 3 figures
Scientific paper
10.1016/j.jmmm.2005.10.049
We report on tunnelling magnetoresistance (TMR), current-voltage (IV) characteristics and low frequency noise in epitaxially grown Fe(110)/MgO(111)/Fe(110) magnetic tunnel junctions (MTJs) with dimensions from 2x2 to 20x20 um2. The evaluated MgO energy barrier (0.50+/-0.08 eV), the barrier width (13.1+/-0.5 angstrom) as well as the resistance times area product (7+/-1 Mohmsum2) show relatively small variation, confirming a high quality epitaxy and uniformity of all MTJs studied. The noise power, though exhibiting large variation, was observed to be roughly anticorrelated with the TMR. Surprisingly, for the largest junctions we observed a strong enhancement of the normalized low-frequency noise in the antiparallel magnetic configuration. This behaviour could be related to an interplay between the magnetic state and the local barrier defects structure of the epitaxial MTJs
Aliev Farkhad G.
Bruckl H.
Fraune M.
Guerrero Rommel
Güntherodt Gernot
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