Berlin 2018 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Multiferroic Oxide Thin Films and Heterostructures I (joint session KFM/TT/MA)

KFM 15.2: Talk

Wednesday, March 14, 2018, 10:00–10:15, EMH 225

Structure and Magnetism of the Co/PZT/LSMO Interface — •Holger Meyerheim¹, Arthur Ernst², Katayoon Mohseni¹, Andrey Polyakov¹, Nathalie Jedrecy³, Andy Quindeau¹, Victor Antonov¹, Manuel Valvidares⁴, Hari Vasili⁴, and Pierluigi Gargiani⁴ — ¹MPI f. Mikrostrukturphysik, D-06120 Halle — ²Inst. für Th. Physik, JKU, A-4040 Linz, Austria — ³INSP, UPMC-Sorbonne Univ., 75005 Paris, France — ⁴Alba, 08290 Cerdanyola del Vallés, Spain

Using surface x-ray diffraction, x-ray absorption fine structure and x-ray circular dichroism (XMCD) experiments we have studied the geometric and magnetic properties of the Co/Pb(Ti_0.8Zr_0.2)O₃ interface. Co deposition in submonolayer amounts on the 2 unit cells thick (Ti,Zr)O₂ terminated Pb (Ti_0.8Zr_0.2)O₃ (PZT) layer leads to the formation of a perovskite type structure with Co-O distances of approximately 2.0 Å (octahedral) and 2.8 Å (cubic) in addition to a metallic Co-Co correlation near 2.4 Å. Co-L_2,3-XMCD spectra also reveal different Co environments, especially two Co-O contributions (A) and (B) related to the octahedral coordination (m=2.69µ_B) and the cubic coordination (m=2.33 µ_B). The XMCD analysis also evidences an anti-FM oriented induced moment at the PZT top layer Ti site (m=-0.005µ_B) related to the negative tunneling electro resistance effect. This result supports the "hybridization model" suggested by D.Pantel et al., Nat. Mat. 11, 289 (2012).
Support by SFB 762 (TP A5) is acknowledged. We thank E. Fonda (Samba at Soleil) and the ALBA staff for help during the experiments.