Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.83: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
Influence of the gold atom on the magnetic properties of the Ni(II) dinuclear complex — •Jaena Park1,2, Y. Krupskaya1, V. Kataev1, G. Steinfeld3, N. Beyer3, J. Lach3, M. Golecki3, U. Lehmann3, M. Gressenbuch3, B. Kersting3, B. Büchner1, and R. Klingeler2 — 1IFW Dresden, Germany — 2University of Heidelberg, Germany — 3University of Leipzig, Germany
Attaching a magnetic molecular complex to a surface, in particular to a metal surface, is important for molecular spintronics applications. In the present work we study the possibility of attaching a Ni-based dimer complex to a gold surface. We have investigated the influence of an attached gold atom on the magnetic properties of the Ni2-complex. Here we report two Ni2-complexes [Ni2L(dpbba)]ClO4(2ClO4) (1) and [Ni2L(dpbba)Au Ph]BPh4(4BPh4) (2) where a gold atom is attached to the phosphorus atom of the head part of (2). Magnetization vs. field M(H) at T = 1.8 K and vs. temperature M(T) at µ0H = 1 T were measured using a SQUID magnetometer. The analysis of the data using a Heisenberg spin Hamiltonian (H = 2JS1S2) reveals that the intramolecular exchange interaction between two core Ni ions is ferromagnetic with J = −23 K and −26 K for (1) and (2), respectively. Our high-field and high-frequency ESR measurements yield a g-factor of 2.17 for both complexes and a negative axial magnetic anisotropy D = −0.063 K and −0.056 K for (1) and (2), respectively, which implies a bistable magnetic ground state in both cases. In conclusion, we observe that the magnetic properties of the Ni2-complex are not significantly changed by the attachment of the gold atom.