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

Kaushik Bairagi (1) , Amandine Bellec (1) , V. Repain (1) , Cynthia Fourmental (1) , C. Chacon (1) , Y. Girard (1) , J. Lagoute (1) , S. Rousset (1) , L. Le Laurent (2) , A. Smogunov (2) , C. Barreteau (2)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
2 GMT - Groupe Modélisation et Théorie

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.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Kaushik Bairagi, Amandine Bellec, V. Repain, Cynthia 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 (1998-2015), 2018, 98, pp.085432. ⟨10.1103/PhysRevB.98.085432⟩. ⟨cea-01866952⟩