Experimental and theoretical investigations of magnetic anisotropy and magnetic hardening at molecule/ferromagnet interfaces

K. Bairagi 1 A. Bellec 1 V. Repain 1, * C. Fourmental 1 C. Chacon 1 Y. Girard 1 J. Lagoute 1 S. Rousset 1 L. Le Laurent 2 A. Smogunov 2 C. Barreteau 2
* Corresponding author
2 GMT - Groupe Modélisation et Théorie
IRAMIS - Institut Rayonnement Matière de Saclay, SPEC - UMR3680 - Service de physique de l'état condensé
Abstract : We measure by means of in situ magneto-optical Kerr effect the magnetism of ultrathin magnetic films supported on gold and platinum during the capping with molecular layers. We observe both for C 60 and Alq 3 molecules deposited on Co films an enhancement of the out-of-plane magnetic anisotropy, leading to a magnetic hardening for out-of-plane magnetization. Surprisingly, the amplitude of this hardening depends strongly on the underlying substrate. While we find an increase of the coercive field around 100% for Co/Au(111), it can reach almost 600% on Co/Pt(111). Those results are discussed by using both tight-binding and ab initio calculations. It is shown on the case of C 60 that both the adsorption geometry and the strain in the magnetic layer can be key ingredients to predict the quantitative change of magnetic anisotropy induced by the interface between a magnetic material and a molecular layer. On the contrary, the crystalline stacking of the Co has a minor influence.
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K. Bairagi, A. Bellec, V. Repain, C. Fourmental, C. Chacon, et al.. Experimental and theoretical investigations of magnetic anisotropy and magnetic hardening at molecule/ferromagnet interfaces. Physical Review B : Condensed matter and materials physics, American Physical Society, 2018, 98, pp.085432. ⟨10.1103/PhysRevB.98.085432⟩. ⟨cea-01866952⟩

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