Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.74: Poster
Tuesday, April 2, 2019, 10:00–13:00, Poster E
Interlayer Exchange Coupling Dependent Variation of the Saturation Magnetization of Multilayered Systems — •Frank Schulz1, Erol Girt2, Zachary Nunn2, and Eberhard Goering1 — 1Max-Planck-Institut für Intelligente Systeme, Stuttgart, Germany — 2Simon Fraser University, Burnaby, Canada
The effect of interlayer exchange coupling in magnetic thin films has proven to be of great technological use, enabling the development of hard drives with very high storage densities. And yet, there are aspects of this effect that are still not fully understood. Recent studies have found that the interlayer thickness of Co/RuFe/Co sandwiches does not only affect the type of interlayer coupling and its strength, but also causes a non-monotonous variation of the saturation magnetization of these systems. In order to investigate this effect, X-ray absorption spectra have been measured in total electron yield. Making use of the X-ray magnetic circular dichroism (XMCD) effect, this gives an element specific method of measuring the magnetic properties of the samples. Additionally, magnetometric measurements have been performed using a superconducting quantum interference device (SQUID), which were combined with simulations using an enhanced Stoner-Wohlfarth model. With these methods, it could be shown that the change in saturation magnetization does not stem from the magnetic contribution of the Fe in the interlayer, but instead can be attributed to a non-magnetic dead layer of Co near the interface of Co and RuFe. The thickness of this dead layer was estimated, under consideration of self absorption effects, to be approximately 0.1 nm.