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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism I (joint session O/MA)

O 110.7: Vortrag

Donnerstag, 19. März 2020, 16:30–16:45, WIL A317

Mapping magnetic anisotropies in molecular junctions — •Cristina Mier¹, Leonard Garnier², Benjamin Verlhac², Roberto Robles¹, Laurent Limot², Nicolás Lorente¹, and Deung-Jang Choi¹ — ¹Centro de Física de Materiales (MPC) CSIC-EHU, San Sebastián, Spain — ²Université de Strasbourg, CNRS, IPCMS, UMR 7504, Strasbourg, France

The ability to control the spin of single molecules is of great interest for the development of quantum technologies. Nickelocene ((Ni(C₅H₅ )₂,NiCp₂) is a magnetic molecule with spin S=1, which shows a big electronic inelastic signal due to the excitation of its spin state [1]. We studied this molecule on a superconducting surface and used a superconducting tip which allows us having a higher energy resolution than the one with normal metallic tips. We found peaks in the differential conductance due to the spin excitations, permitting us to determine the magnetic anisotropy energy (MAE) of the system. The energy position of peaks is slightly shifted at different molecules, which indicates differences in magnetic anisotropy energies for each molecules. This study gives us more parameters to tune the MAE in a molecular junction.

[1] M. Ormaza, N. Bachellier, M. N. Faraggi, B. Verlhac, P. Abufager, P. Ohresser, L. Joly, M. Romeo, F. Scheurer, M.-L. Bocquet, N. Lorente, and L. Limot. Efficient spin-flip exci- tation of a nickelocene molecule. Nano Letters, 17(3):1877*1882, 2017. PMID: 28199115.