Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Thyssen-Krupp Electrical Steel Ph. D. Thesis Award (Dissertationspreis)

MA 10.2: Hauptvortrag

Montag, 7. März 2016, 15:25–15:50, H32

Magnetic Molecules for Spintronics — •Manuel Gruber — Physikalisches Institut, KIT, Germany & IPCMS, Strasbourg

Understanding the properties of molecules at the interface with metals is a fundamental issue for organic spintronics. The first part of the talk is devoted to the study magnetic properties of planar manganese-phthalocyanine (MnPc) molecules and Co films. We evidenced that the first molecular layers form vertical columns perpendicular to the Co(100) surface with antiferromagnetic ordering at room temperature. In turn, these antiferromagnetic molecular columns pin the magnetization of the Co substrate at low temperatures, i.e. lead to exchange bias. Alternatively, we have shown that the magnetic coupling between MnPc and the Co substrate persists when separated by a non-magnetic Cu spacer through interlayer exchange coupling.

The second part of talk is focused on the study of a spin-crossover complex, Fe(phen)2(NCS)2 sublimed on Cu(100) and Cu(100)/CuN. Both spin species of the molecule coexist at low temperatures. While on bare Cu(100), the molecules cannot be switched between the two spin states, molecules on CuN can individually and reproducibly be switched between a high-spin and a low-spin state. This difference is explained by the role of the CuN layer to decouple the molecules from the metallic surface. Moreover the spin transition is also observed for the second-ML molecules decoupled from the Cu(100) substrate by the first-ML.