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 substrate — Chriatian Wäckerlin1, Dorota Chylarecka1, Armin Kleibert2, Kathrin Müller1, Cristian Iacovita3, Frithjof Nolting2, Thomas A. Jung1, and •Nirmalya Ballav1 — 1Laboratory 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.