0000000000216680

AUTHOR

Alexander Föhlisch

showing 2 related works from this author

Ultrafast and Energy-Efficient Quenching of Spin Order: Antiferromagnetism Beats Ferromagnetism

2017

By comparing femtosecond laser pulse induced ferro- and antiferromagnetic dynamics in one and the same material - metallic dysprosium - we show both to behave fundamentally different. Antiferromagnetic order is considerably faster and much more efficiently manipulated by optical excitation than its ferromagnetic counterpart. We assign the fast and extremely efficient process in the antiferromagnet to an interatomic transfer of angular momentum within the spin system. Our findings do not only reveal this angular momentum transfer channel effective in antiferromagnets and other magnetic structures with non-parallel spin alignment, they also point out a possible route towards energy-efficient …

PhysicsQuenchingCondensed Matter - Materials ScienceAngular momentumCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsInstitut für Physik und AstronomieGeneral Physics and AstronomyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesFerromagnetismUltrafast magnetic dynamics antiferromagnetic dynamics interatomic spin transfer0103 physical sciencesFemtosecondMesoscale and Nanoscale Physics (cond-mat.mes-hall)AntiferromagnetismCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologyUltrashort pulseExcitationSpin-½
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Cationic and Anionic Impact on the Electronic Structure of Liquid Water

2017

Hydration shells around ions are crucial for many fundamental biological and chemical processes. Their local physicochemical properties are quite different from those of bulk water and hard to probe experimentally. We address this problem by combining soft X-ray spectroscopy using a liquid jet and molecular dynamics (MD) simulations together with ab initio electronic structure calculations to elucidate the water–ion interaction in a MgCl2 solution at the molecular level. Our results reveal that salt ions mainly affect the electronic properties of water molecules in close vicinity and that the oxygen K-edge X-ray emission spectrum of water molecules in the first solvation shell differs signi…

hydration cellsAb initio02 engineering and technologyElectronic structure010402 general chemistry01 natural sciencesBathochromic shiftMoleculeGeneral Materials ScienceEmission spectrumPhysical and Theoretical ChemistrySpectroscopyta116Lone pairliquid waterta114ionitChemistryInstitut für Physik und Astronomie021001 nanoscience & nanotechnologyelectronic structure0104 chemical sciencesSolvation shell13. Climate actionChemical physicsionsAtomic physics0210 nano-technology
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