Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions

Schmalhorst J-M, Bruckl H, Reiss G, Gieres G, Wecker J (2003)
JOURNAL OF APPLIED PHYSICS 94(5): 3268-3270.

Journal Article | Published | English

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Abstract
The thermally induced changes of the magnetic coupling in an artificial antiferromagnet exchange biased by an antiferromagnetic layer in a magnetic tunnel junction (Mn-Ir/Co-Fe/Ru/Co-Fe/AlOx/Ni-Fe) is investigated for annealing temperatures up to 450degreesC. Beside the usual increase of the tunneling magnetoresistance (TMR) by annealing (maximum TMR 43.9% at 325degreesC) the degradation of the artificial antiferromagnet causes a well-defined 90degrees coupling of the Co-Fe layers in a narrow temperature window around 325degreesC. At higher temperature, both Co-Fe layers are coupled ferromagnetically but the exchange biasing by the Mn-Ir is still present. This behavior results from an interplay of different coupling mechanisms of the two Co-Fe layers: (1) indirect antiferromagnetic interlayer exchange coupling across the Ru spacer, (2) ferromagnetic coupling by pinholes in the Ru spacer, and (3) exchange coupling between the lower Co-Fe layer and the antiferromagnet Mn-Ir. The importance of each contribution is discussed with respect to thermally activated diffusion processes. (C) 2003 American Institute of Physics.
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Schmalhorst J-M, Bruckl H, Reiss G, Gieres G, Wecker J. Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions. JOURNAL OF APPLIED PHYSICS. 2003;94(5):3268-3270.
Schmalhorst, J. - M., Bruckl, H., Reiss, G., Gieres, G., & Wecker, J. (2003). Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions. JOURNAL OF APPLIED PHYSICS, 94(5), 3268-3270.
Schmalhorst, J. - M., Bruckl, H., Reiss, G., Gieres, G., and Wecker, J. (2003). Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions. JOURNAL OF APPLIED PHYSICS 94, 3268-3270.
Schmalhorst, J.-M., et al., 2003. Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions. JOURNAL OF APPLIED PHYSICS, 94(5), p 3268-3270.
J.-M. Schmalhorst, et al., “Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions”, JOURNAL OF APPLIED PHYSICS, vol. 94, 2003, pp. 3268-3270.
Schmalhorst, J.-M., Bruckl, H., Reiss, G., Gieres, G., Wecker, J.: Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions. JOURNAL OF APPLIED PHYSICS. 94, 3268-3270 (2003).
Schmalhorst, Jan-Michael, Bruckl, H, Reiss, Günter, Gieres, G, and Wecker, J. “Thermally induced changes of magnetic coupling in a pinned artificial antiferromagnet used in magnetic tunnel junctions”. JOURNAL OF APPLIED PHYSICS 94.5 (2003): 3268-3270.
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