Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing

Schmalhorst J-M, Brückl H, Reiss G, Gieres G, Wecker J (2002)
JOURNAL OF APPLIED PHYSICS 91(10): 7478-7480.

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Abstract / Bemerkung
In spin valve and magnetic tunnel junction systems, the soft sensing layer should be sensitive to small fields of a few hundred A/m and should not be influenced by the adjacent magnetic hard layer. In polycrystalline films, however, congruent interface roughness invokes a ferromagnetic coupling, which can be compensated by an antiferromagnetic magnetostatic dipole coupling in patterned elements. In this paper, we demonstrate the evolution of the magnetic interlayer interaction by annealing in tunnel junctions with Al2O3 barrier. Whereas the minor loop shifting field of the soft magnetic NiFe sense layer is constant or varies only slightly from 2 kA/m to 1.15 kA/m for 1-1.5 nm thick barriers, an eightfold increase of the coercivity is found after annealing above 350 degreesC. Microstructural investigations give evidence that small ferromagnetic clusters arise in the hard layer of the junctions (Cu/CoFe/Ru/CoFe) by diffusion of Cu, Co, and Fe. The density and the stray field of these clusters are determined by magnetic force measurements and can be correlated to the increased switching field strength. (C) 2002 American Institute of Physics.
Erscheinungsjahr
2002
Band
91
Ausgabe
10
Seite(n)
7478-7480
ISSN
0021-8979
Page URI
https://pub.uni-bielefeld.de/record/1614568

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Schmalhorst J-M, Brückl H, Reiss G, Gieres G, Wecker J. Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing. JOURNAL OF APPLIED PHYSICS. 2002;91(10):7478-7480.
Schmalhorst, J. - M., Brückl, H., Reiss, G., Gieres, G., & Wecker, J. (2002). Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing. JOURNAL OF APPLIED PHYSICS, 91(10), 7478-7480. doi:10.1063/1.1447874
Schmalhorst, J. - M., Brückl, H., Reiss, G., Gieres, G., and Wecker, J. (2002). Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing. JOURNAL OF APPLIED PHYSICS 91, 7478-7480.
Schmalhorst, J.-M., et al., 2002. Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing. JOURNAL OF APPLIED PHYSICS, 91(10), p 7478-7480.
J.-M. Schmalhorst, et al., “Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing”, JOURNAL OF APPLIED PHYSICS, vol. 91, 2002, pp. 7478-7480.
Schmalhorst, J.-M., Brückl, H., Reiss, G., Gieres, G., Wecker, J.: Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing. JOURNAL OF APPLIED PHYSICS. 91, 7478-7480 (2002).
Schmalhorst, Jan-Michael, Brückl, Hubert, Reiss, Günter, Gieres, G, and Wecker, J. “Evolution of magnetic coupling in ferromagnetic tunnel junctions by annealing”. JOURNAL OF APPLIED PHYSICS 91.10 (2002): 7478-7480.