Project

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Controlling Spins in Molecular Adsorbates by a Chemical Switch

English title Controlling Spins in Molecular Adsorbates by a Chemical Switch
Applicant Jung Thomas
Number 132868
Funding scheme Project funding (Div. I-III)
Research institution Mikro- und Nanotechnologie Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.02.2011 - 31.03.2014
Approved amount 200'000.00
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All Disciplines (2)

Discipline
Condensed Matter Physics
Material Sciences

Keywords (12)

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

Lay Summary (English)

Lead
Lay summary
Lead: Chemically tuneable magnetic molecules exhibit new and attractive properties, particularly for the field of molecular spintronics. In this project the magnetic response of molecular spins, i.e. magnetic moments in organic molecules, coupled to magnetic substrates, to externall stimuli will be investigated in view of future spin based device applications.Background:X-ray magnetic circular dichroism (XMCD) experiments on surface supported magnetic molecules have been pioneered at the Swiss Light Source (SLS), has now been confirmed experimentally by other scientists and has been complemented with theoretical studies. Recently, we have established a microscopic understanding of the processes behind the observed magnetic coupling. Key to this scientific project is the spectro-microscopy correlation, i.e. the combination of scanning probe techniques with spectroscopy methods, also with Synchrotron Light and the comparison with numerical model calculations. In established collaboration with synthetic chemists selected organic molecules (paramagnetic metalloporphyrins and metallophthalocyanines) on different magnetic substrates and in conjunction with different chemical stimuli shall be studied. Goal: By spectro-microscopy correlation experiments the origin of the coupling of paramagnetic adsorbate molecules in their ferromagnetic or antiferromagnetic coupling to magnetic substrates shall be explored. Relevance: The experiments are expected to provide an in-depth understanding of the complex behaviour of molecular magnetic interfaces in regard to the exchange coupling. Thereby we may acquire knowledge with relevance to organic spintronic interfaces and towards the design of magneto-organic interfaces in a similar way to the conventional hard-magnetic layers and their data storage and device applications.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Ammonia Coordination Introducing a Magnetic Moment in an On-Surface Low-Spin Porphyrin.
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), xxx.
Emergence of On-Surface Magnetochemistry
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.
Magnetic exchange coupling of a synthetic Co(II)-complex to a ferromagnetic Ni substrate
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.
On-surface coordination chemistry: direct imaging of the conformational freedom of an axial ligand at room temperature
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.
Porphyrin metalation providing an example of a redox reaction facilitated by a surface reconstruction.
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.
Two-Dimensional Supramolecular Electron Spin Arrays.
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.), ssxs.
On-surface coordination chemistry of planar molecular spin systems: novel magnetochemical effects induced by axial ligands
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.
Assembly of 2D ionic layers by reaction of alkali halides with the organic electrophile 7,7,8,8-tetracyano-p-quinodimethane (TCNQ)
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.
Indirect Magnetic Coupling of Manganese Porphyrin to a Ferromagnetic Cobalt Substrate
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.

Collaboration

Group / person Country
Types of collaboration
IISER Pune, Indien India (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
University of Uppsala Sweden (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Communication with the public

Communication Title Media Place Year
Media relations: print media, online media 20 Minuten SCIENCE German-speaking Switzerland 2011
New media (web, blogs, podcasts, news feeds etc.) NZZ Campus German-speaking Switzerland 2011

Associated projects

Number Title Start Funding scheme
121461 Scanning Tunneling Microscopy and Spectroscopy at variable Temperatures for the physical and chemical investigation of surface mounted supra-molecular assemblies. 01.07.2008 R'EQUIP
144991 Thermal Desorption Mass Spectrometry for the Investigation of on-surface Chemistry and Supramolecular Chemistry 01.10.2013 R'EQUIP
126651 Neue Einsichten in die Sonden-Proben-Wechselwirkung bei den Rastersondenmethoden 01.10.2009 Project funding (Div. I-III)
113718 Induced magnetic ordering in molecular monolayers 01.02.2008 Project funding (Div. I-III)
113149 Monochromatised X-ray Photoelectron Spectroscopy (XPS) and low current Scanning Tunneling Microscopy (STM) imaging for the study, of organic monolayers in preparation of SLS surface science beamtimes 01.07.2006 R'EQUIP
113718 Induced magnetic ordering in molecular monolayers 01.02.2008 Project funding (Div. I-III)
153549 On-Surface Magnetochemistry 01.04.2014 Project funding (Div. I-III)
153549 On-Surface Magnetochemistry 01.04.2014 Project funding (Div. I-III)

Abstract

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 [1] 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 [8]. 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.
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