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Magnetic Objects on the NanoScale (DMONS) Research Teams of DMONS Support for research Benoit LECONTE Short Period Magnetic Coupling Oscillations in Co/Si Multilayers

Short Period Magnetic Coupling Oscillations in Co/Si Multilayers

spip.php25Short Period Magnetic Coupling Oscillations in Co/Si Multilayers : Theory versus Experiment N. Yaacoub, C. Meny, O. Bengone, P. Panissod, Phys. Rev. Lett. 97, 257206 (2006)

Today the magnetic properties of multilayers and nanostructures including a metal or an insulator as a nonmagnetic spacer layer are rather well understood. But they are much more controversial for semiconductor spacers. For instance, for Co/Si multilayers short period coupling oscillations are predicted by ab initio computations but have yet to be observed. Here we show in Co/Si multilayers prepared at low temperature (90 K) strong saturation field oscillations that are consistent with the predicted coupling oscillations. However, the decay length of the oscillations is much longer than the expected one and cannot be explained within the framework of available theories.

En haut : exemple de courbes d’aimantation de multicouches SitSinm/Co3nm. En bas : énergie nécessaire pour saturer les échantillons des multicouches Co/Si en fonction de l’épaisseur de Si. ction de l’épaisseur de silicium (en mRy sur l’échelle de gauche et en erg/cm2 pour pouvoir comparer avec l’expérience sur l’échelle de droite). Les valeurs (positives) négatives correspondent à un couplage (anti) ferrromagnétique des couches de cobalt magnétiques.

Magnetic properties of the Co=Si multilayers versus the Si spacer thickness. Top panel: examples of magnetization curves. Bottom panel: magnetic energy needed to saturate the samples.

Couplage d’échange calculé dans des multicouches Co/Si(n)/Co en fonction de l’épaisseur de silicium (en mRy sur l’échelle de gauche et en erg/cm2 pour pouvoir comparer avec l’expérience sur l’échelle de droite). Les valeurs (positives) négatives correspondent à un couplage (anti) ferrromagnétique des couches de cobalt magnétiques.

NMR spectra of Co=Si multilayers. Increasing the Co thickness does increase the bulk contribution only. The interface width is limited by low temperature elaboration.(positives) négatives correspondent à un couplage (anti) ferrromagnétique des couches de cobalt magnétiques.

Couplage echange magnetique oscillant multicouches CobaltSilicium - image 4

Calculated exchange coupling of Co=Si-n-=Co multilayers as a function of silicon thickness. The coupling strength is given in mRy per computation shell (left scale) and in erg=cm2 (right scale) for comparison with experimental values. Positive and negative values stand for antiferromagnetic (AFM) and ferromagnetic (FM) coupling, respectively, of the cobalt magnetic layers.

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