Magnetic Molecules; Porphyrins and Phthalocyanines; Molecular Spintronics; X-ray Magnetic Circular Dichroism; Scanning Probe Microscopy; X-ray Absorption Spectroscopy XAS; Spectro-Microscopy Correlation; spin switching; surface science; nanoscale science; X-ray absorption Spectroscopy; X-ray photoemission spectroscopy
Wäckerlin Christian, Tarafder Kartick, Girovsky Jan, Nowakowski Jan, Hählen Tatjana, Shchyrba Aneliia, Siewert Dorota, Kleibert Armin, Nolting Frithjof, Oppeneer Peter M, Jung Thomas A, Ballav Nirmalya (2013), Ammonia Coordination Introducing a Magnetic Moment in an On-Surface Low-Spin Porphyrin., in Angewandte Chemie (International ed. in English)
Ballav Nirmalya, Waeckerlin Christian, Siewert Dorota, Oppeneer Peter M., Jung Thomas A. (2013), Emergence of On-Surface Magnetochemistry, in JOURNAL OF PHYSICAL CHEMISTRY LETTERS
, 4(14), 2303-2311.
Waeckerlin Christian, Maldonado Pablo, Arnold Lena, Shchyrba Aneliia, Girovsky Jan, Nowakowski Jan, Ali Md. Ehesan, Haehlen Tatjana, Baljozovic Milos, Siewert Dorota, Kleibert Armin, Muellen Klaus, Oppeneer Peter M., Jung Thomas A., Ballav Nirmalya (2013), Magnetic exchange coupling of a synthetic Co(II)-complex to a ferromagnetic Ni substrate, in CHEMICAL COMMUNICATIONS
, 49(91), 10736-10738.
Waeckerlin Christian, Siewert Dorota, Jung Thomas A., Ballav Nirmalya (2013), On-surface coordination chemistry: direct imaging of the conformational freedom of an axial ligand at room temperature, in PHYSICAL CHEMISTRY CHEMICAL PHYSICS
, 15(39), 16510-16514.
Nowakowski Jan, Wäckerlin Christian, Girovsky Jan, Siewert Dorota, Jung Thomas A, Ballav Nirmalya (2013), Porphyrin metalation providing an example of a redox reaction facilitated by a surface reconstruction., in Chemical communications (Cambridge, England)
, 49(23), 2347-9.
Wäckerlin Christian, Nowakowski Jan, Liu Shi-Xia, Jaggi Michael, Siewert Dorota, Girovsky Jan, Shchyrba Aneliia, Hählen Tatjana, Kleibert Armin, Oppeneer Peter M, Nolting Frithjof, Decurtins Silvio, Jung Thomas A, Ballav Nirmalya (2013), Two-Dimensional Supramolecular Electron Spin Arrays., in Advanced materials (Deerfield Beach, Fla.)
Waeckerlin Christian, Tarafder Kartick, Siewert Dorota, Girovsky Jan, Haehlen Tatjana, Iacovita Christian, Kleibert Armin, Nolting Frithjof, Jung Thomas A., Oppeneer Peter M., Ballav N. (2012), On-surface coordination chemistry of planar molecular spin systems: novel magnetochemical effects induced by axial ligands, in Chemical Sciences
, 2012(3), 3154-3160.
Wackerlin C, Iacovita C, Chylarecka D, Fesser P, Jung TA, Ballav N (2011), Assembly of 2D ionic layers by reaction of alkali halides with the organic electrophile 7,7,8,8-tetracyano-p-quinodimethane (TCNQ), in CHEMICAL COMMUNICATIONS
, 47(32), 9146-9148.
Chylarecka D, Kim TK, Tarafder K, Muller K, Godel K, Czekaj I, Wackerlin C, Cinchetti M, Ali ME, Piamonteze C, Schmitt F, Wustenberg JP, Ziegler C, Nolting F, Aeschlimann M, Oppeneer PM, Ballav N, Jung TA (2011), Indirect Magnetic Coupling of Manganese Porphyrin to a Ferromagnetic Cobalt Substrate, in JOURNAL OF PHYSICAL CHEMISTRY C
, 115(4), 1295-1301.
Chemically tuneable magnetic molecules exhibit new and attractive properties, particularly in the field of molecular spintronics. In the here proposed research plan which is submitted in continuation of a currently running SNF proposal (ID: 200021-113718; Title: ‘Induced Magnetic Ordering in Molecular Monolayers’), the magnetic response of molecular spins, coupled to magnetic substrates, to chemical stimuli will be investigated by X-ray magnetic circular dichroism (XMCD) at the Swiss Light Source (SLS). The proposed work starts with the first observation of substrate induced magnetic ordering of a molecular monolayer by our group  which has now been confirmed experimentally by others with theoretical inputs as well [2-7]. Recently, we have established a microscopic understanding of the processes behind the observed magnetic coupling . Unique abilities of our group to perform lab-based experiments (X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunnelling microscopy and spectroscopy (STM and STS), and low-energy electron diffraction (LEED)) as well as synchrotron measurements (XMCD and near-edge X-ray absorption fine structure spectroscopy (NEXAFS)) on the same sample without breaking the vacuum give us the possibility to make a spectro-microscoic characterization of the samples and therefore allow us to approach the origin of the magnetic coupling. Various organic molecules (paramagnetic metalloporphyrins and metallophthalocyanines) on different types of substrates (ferromagnetic metallic Co, Ni and Fe thin films) shall be studied. The modification of their electronic coupling to the substrate by dosing oxygen or chlorine gas (i.e. acting as surfactants) to the substrate or their direct modification by chemical stimuli (e.g. nitric oxide (NO) as a test) and the consequent magnetic coupling and spin state are providing the focus point of this proposal.Our proposed experiments are expected to provide an in-depth understanding of the complex behaviour of molecular magnetic interfaces in regard to the exchange coupling phenomena. Furthermore, the efficient control of coupled molecular spin systems by surface coordination chemistry may enable to manipulate magnetic transport measurements at various interfaces. Such an approach is a prerequisite to the design of magneto-organic interfaces in a similar way to the conventional hard-magnetic layers and their applications as well.