In thermal equilibrium the solubility of interstitial Boron in bcc Fe-Co does not exceed 0.1 atomic percent (at.%), but the solubility limit can be significantly increased using non-equilibrium preparation methods such as pulsed laser deposition (PLD). In a recent paper published in Journal of Physics: Condensed Matter, Salikhov et al. use PLD to deposit Fe-Co and achieve doping levels of up to 4 at.% of interstitial B. These films are tetragonally distorted and show improved magnetic properties due to the influence of spin-orbit coupling. Hear more from the authors about their research below:
Tetragonal distortion yields large magnetocrystalline anisotropy energy (MAE), which is an important consideration when designing materials for permanent magnets. Furthermore, we identify an enhanced influence of spin-orbit coupling (SOC) as seen from the increased orbital magnetic moment and spectroscopic splitting (g-) factor compared to cubic and un-doped Fe-Co. These results are essential to understand the influence of SOC on the magnetic properties of the alloys, which are crucial for applications in spintronic devices, logic systems and tunneling magnetoresistance elements, where Fe-Co and Fe-Co-B alloys are widely used. We also show that the magnetic damping parameter decreases with increasing B concentration, making these materials attractive for magnonics applications. The figure below summarizes some of the main results of our study.
About the authors
This work is a collaborative research work between the group of Professor Michael Farle from University of Duisburg-Essen, group of Dr. Sebastian Fähler from IFW Dresden, group of Professor Olle Eriksson from Uppsala University and Dr. Radu Abrudan from Helmholtz-Zentrum-Berlin. The work has been performed within the European Community’s Seventh Framework Programme No. 280670 REFREEPERMAG.
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