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MA: Fachverband Magnetismus
MA 38: MagneticThin Films I
MA 38.13: Vortrag
Donnerstag, 29. März 2012, 12:45–13:00, H 0112
The importance of beyond-Heisenberg interactions in ferromagnetic metal/antiferromagnetic oxides interfaces — •Valerio Bellini1, Gustav Bihlmayer2, Franca Manghi1,3, and Stefan Blügel1 — 1CNR - Istituto di Nanoscienze - S3, Modena, Italy — 2Peter Grünberg Institut (PGI-1) and IAS-1, Forschungszentrum Jülich, Jülich, Germany — 3Dipartimento di Fisica, Università di Modena and Reggio Emilia, Modena, Italy
We present a density functional theory investigation of transition metal (TM) monolayers, i.e. Fe, Co, and Ni, on NiO(001). By means of the constrained local moment approach implemented in the FLEUR code [1], we analyze the possibility of attaining a perpendicular spin-flop canted state of the Ni spin moments with respect to the TM moments at the Ni layers close to the interface. In order to interpret the observed behaviors within a localized spin model Hamiltonian approach, beyond-Heisenberg, i.e. biquadratic terms, have to be necessarily taken into account. The competition between the different interactions at the interface determines whether the spin-flop state is the magnetic ground state of the systems across the series [2]. In light of our theoretical results, we give a possible interpretation of recent XMLD experiments [3,4] on these interfaces, in terms of Ni uncompensated spins originating from a reduced Ni layer at the interface, and mediating the coupling between the TM and the NiO spins. [1] Ph. Kurz, et al., Phys. Rev. B 69 024415 (2004). [2] V. Bellini, et al., to be submitted (2011). [3] G. van del Laan, et al., Phys. Rev. B 83, 064409 (2011). [4] S. Mandal, et al., Europhys. Lett. 95, 27006 (2011).