Heiko Wende

Flux-mediated ligand exchange restructures metal–organic framework glasses

Jan‐Benedikt Weiß, Lorena Fritsch, Michele Tricarico, Anke Schoch et autres

Abstract Melt-quenched glasses derived from metal–organic frameworks (MOFs) combine the processability of glasses with the modularity and microporosity of MOFs, yet remain structurally and functionally less diverse than crystalline analogues. Here we show that the chelating ligand 1,10-phenanthroline acts as an organic …

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Nanoscale Confinement Enhances Ultrafast Demagnetization

Yoav William Windsor, Tobias Lojewski, Moumita Kundu, K. Sokolowski-Tinten et autres

Nanoscale miniaturization has revolutionized the field of spintronics by enabling exponential growth in areal bit density. A similar leap is also expected in device speeds through successfully harnessing femtosecond magnetization dynamics. However, combining this with the miniaturization of realistic devices is challenging. …

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Decoupling Diffusion- and Field-Driven Ion Transport in Graphene Oxide/Tungsten Disulfide Heterolaminar Composites

Yossarian Liebsch, Ann-Sophie Meyer, André Maas, Simon Rauls et autres

Laminar graphene oxide (GO) films provide a model platform for studying ion transport in nanometer-scale two-dimensional (2D) nanochannels. We investigate how incorporation of tungsten disulfide (WS2) nanoflakes redistributes ionic transport in GO laminates between diffusion- and field-driven regimes. GO/WS2 composites show a …

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Multiferroic properties of BiFeO3-based high entropy ceramics

M. Escobar-Castillo, Vladimir V. Shvartsman, Onur Atmaca, Soma Salamon et autres

The design concept of high-entropy materials is based on the stabilization of phases with improved or even novel functionalities through increased configurational entropy. This is achieved by incorporating multiple elements in nearly equimolar ratios. This strategy has already revolutionized structural materials and …

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PUMA - PUlsed high MAgnetic fields for new functional magnetic materials

Benedikt Eggert, Ana Kurtanidze, Heiko Wende, Shingo Yamamoto

In the BMBF-funded project ‘PUMA - PUlsed high MAgnetic fields for new functional magnetic materials’ we aim at the identification of new magnetic materials for green-energy applications using a combined experimental and theoretical approach. We will study materials needed for the emerging …

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Stabilization of the hcp structure in the ruthenium-substituted high-entropy Cantor alloys Cr 20 Mn 20 ( Fe 20 − x Ru x ) Co 20 Ni 20 (0 ≤ x ≤ 20) and their magnetic and structural properties

Yaşar Orbay, David Koch, Benedikt Eggert, Aslı Çakır et autres

While the valence electron concentration (VEC) of the system Cr 20 Mn 20 ( Fe 20 − x Ru x ) Co 20 Ni 20 ( 0 ≤ x ≤ 20 ), where Fe is partially substituted by Ru, remains at eight …

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Nanoscale Confinement Enhances Ultrafast Demagnetization

Yoav William Windsor, Tobias Lojewski, Moumita Kundu, K. Sokolowski-Tinten et autres

Nanoscale miniaturization has revolutionized the field of spintronics by enabling exponential growth in areal bit density. A similar leap is also expected in device speeds through successfully harnessing femtosecond magnetization dynamics. However, combining this with the miniaturization of realistic devices is challenging. …

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Final Report on "Microscopic understanding of disorder induced ferromagnetism in B2-alloy thin films II (MUMAGI II)"

Rantej Bali, Heiko Wende

Final Report on "Microscopic understanding of disorder induced ferromagnetism in B2-alloy thin films II (MUMAGI II)", funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project number 322462997.

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Final Report on "Microscopic understanding of disorder induced ferromagnetism in B2-alloy thin films II (MUMAGI II)"

Rantej Bali, Heiko Wende

Final Report on "Microscopic understanding of disorder induced ferromagnetism in B2-alloy thin films II (MUMAGI II)", funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project number 322462997.

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Data publication: Catalytic Activity of Cobalt Ferrites in Water Oxidation Reactions and Its Defect Dependency

Anna Rabe, Ahmed Gamal Attallah Elsherif, Benedikt Eggert, Eric Hirschmann et autres

CoFe2O4 (CFO) nanoparticles were synthesized via controlled co-precipitation with subsequent calcination at 400 °C, 500 °C, and 600 °C to systematically investigate the influence of thermal treatment on mesostructure, catalytic performance, and especially defect landscape. Structural characterization revealed enhanced crystallinity, sintering, and …

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Data publication: Catalytic Activity of Cobalt Ferrites in Water Oxidation Reactions and Its Defect Dependency

Anna Rabe, Ahmed Gamal Attallah Elsherif, Benedikt Eggert, Eric Hirschmann et autres

CoFe2O4 (CFO) nanoparticles were synthesized via controlled co-precipitation with subsequent calcination at 400 °C, 500 °C, and 600 °C to systematically investigate the influence of thermal treatment on mesostructure, catalytic performance, and especially defect landscape. Structural characterization revealed enhanced crystallinity, sintering, and …

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Investigating the kinetics of spin-crossover transitions using Raman spectroscopy

Gérald Kämmerer, Lea Kämmerer, Stephan Sleziona, Senthil Kumar Kuppusamy et autres

The room-temperature spin-crossover iron(II) complex Fe(1-bpp-COOC$_2$H$_5$)$_2$(BF$_4$)$_2$CH$_3$CN exhibits reversible switching between the low-spin and high-spin states. The observation of coexisting spin domains within polycrystalline samples of Fe(1-bpp-COOC$_2$H$_25$)$_2$(BF$_4$)$_2$CH$_3$CN allows for real-time video recording of domain boundary propagation under an optical microscope. Quantitative analysis of …