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Study of the magnetic coupling in soft-hard bilayer systems

Authorsde la Figuera, Juan ; Sánchez-Cortés, Santiago ; Mandziak, Anna; Dávalos, J.Z. ; Sánchez-Arenillas, M.; Marco, José F.; Prieto, J. E.; Prieto, P.; Foerster, M.; Aballe, L.; Granados-Miralles, Cecilia ; Delgado Soria, Guiomar; Quesada, A.
Issue Date19-May-2019
Citation5th Mediterranean Conference on the Applications of the Mössbauer Effect / 41st Workshop of the French speaking Group of Mössbauer Spectroscopy (2019)
AbstractCurrently the use of magnets is extended to a variety of devices, such as generators, magnetic recording media, components for RF and microwaves. However, many of these magnets contain rare earths, critical elements whose extraction is environmentally harmful and that present price volatility risks. Their replacement by cheaper and more environmentally friendly materials is therefore sought. The alternative that we propose is the manufacture of magnets by means of combinations of oxides and metals. Specifically, the oxide to be used is strontium hexaferrite (SrFe12O19, SFO). This material has a high magnetocrystalline anisotropy and a high coercive field, but has a moderate saturation magnetization [1]. Improvements in saturation magnetization have been detected without a large decrease in coercivity by combining a magnetically hard material (oxide) with another material magnetically soft (ferromagnetic metal) [2]. Therefore, we are studying the magnetic coupling of a bilayer system model comprises a thin film of SFO with a layer of cobalt on top. To stimulate the magnetic coupling between the two layer we were looking for the magnetization of the hard material to be in-plane. Thus we have tried several power conditions in the magnetron device (from 60W to 260W). The Mössbauer results showed that this was achieved at 260W plus a subsequent annealing in air at 850ºC (Fig. 1). The structure and composition of the SFO layer have been characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Photoemission electron microscopy (PEEM) combined with X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD), (Fig.2a). We have grown the magnetically soft layer by molecular-beam epitaxy and we have analyzed the resulting bilayer system through PEEM XAS and XMCD measurements (Fig. 2b).
DescriptionMECAME / GFSM 2019, Montpellier, 19 to 23 may 2019 .-- In honour of Dr Jean-Claude Jumas (Institut Charles Gerhardt, CNRS, University of Montpellier, France). -- https://mecame-gfsm2019.irb.hr/
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(IQFR) Comunicaciones congresos
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