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Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 70: Gerhard Ertl Young Investigator Award

O 70.1: Talk

Thursday, March 17, 2011, 11:15–11:45, WIL C307

A chemical switch for molecular spins undergoing exchange coupling with magnetic substrateChriatian Wäckerlin1, Dorota Chylarecka1, Armin Kleibert2, Kathrin Müller1, Cristian Iacovita3, Frithjof Nolting2, Thomas A. Jung1, and •Nirmalya Ballav11Laboratory for Micro and Nanotechnology, Paul Scherrer Institut, 5232 Villigen, Switzerland — 2Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland — 3Department of Physics, University of Basel, 4056 Basel, Switzerland

The regulation of oxygen affinity in hemoglobin by the iron-porphyrin moiety as shown in nature has been used as a designed concept to perform the switching event of single molecular spins on the surface. This degree of control is achieved upon modifying the coordination sphere of the metal ion of a cobalt(II)tetraphenylporphyrin (CoTPP) molecule ferromagnetically coupled to a nickel (Ni) thin film substrate by the nitric oxide (NO) functioning as an axial ligand. On NO addition, coordination sphere of the Co-ion is modified and a NO-CoTPP nitrosyl complex is formed, which corresponds to an off-state of the Co spin. Thermal dissociation of NO from the nitrosyl complex restores the on-state of the Co spin. The NO-induced reversible off-on switching of surface adsorbed molecular spins observed here is attributed to a spin-trans effect. Use of external stimuli to control single molecular spins at magnetic-interfaces is of potential interest for spintronics and quantum information.

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