Helmholtz-Zentrum Berlin für Materialien und Energie

Achieving High Spatial Resolution Transmission Electron Microscopy Studies in Closed Liquid Cells

Liquid cell transmission electron microscopy (LCTEM) is a rising technique for probing dynamic processes and structural transformations in liquid environments at the nanoscale. However, its broader application is largely constrained by limited spatial resolution, which arises fro...

Endogenous Functional Group Engineering Enables High‐Efficiency Hard Carbon Anodes for Sodium‐ion Batteries

ABSTRACT Hard carbon is a leading anode for sodium‐ion batteries, but its widespread use is still prevented from low initial Coulombic efficiency (ICE) and unstable electrode‐electrolyte interfaces. In this work, we show that engineering endogenous functional groups can directly...

Recyclable and Degradable Covalent Adaptable Polymer Networks ( CANs ) Based on Dynamic Thiol–Yne Reactions

ABSTRACT Covalent adaptable networks (CANs) have been introduced as an alternative to classical thermosets. The presence of dynamic covalent bonds can be utilized to enable (re‐)processability and, consequently, the recyclability of these polymer networks. Within this context, we...

Correlative microscopy reveals chemical short-range order and native oxide in medium-entropy alloys

High- and medium-entropy alloys can exhibit exceptional sets of mechanical and catalytic properties underpinned by the vast array of local atomic arrangements. Among the key features governing properties is the self-assembly of specific atomic neighborhoods, a process known as ch...

An Examination of the Cs 2 NaInCl 6 Luminescence: Interplay of Self‐Generated In + and Doped Sb 3+ , Er 3+ /Yb 3+ Ions

ABSTRACT This work introduces a novel explanation of the visible (Vis‐) and near‐infrared (NIR) Cs 2 NaInCl 6 luminescence based on spontaneously formed In 3+ →In + and a doping method by utilizing Er 3+ /Yb 3+ and Sb 3+ ions. A combined experimental and theoretical approach has...

Direct Observation of Propagating Spin Waves in a Spin Hall Nano‐Oscillator

Constriction-based spin Hall nano-oscillators (SHNOs) show great promise for application as highly tunable microwave sources with straightforward scalability toward large coupled networks. However, details of the magnetization dynamics within SHNOs have thus far not been addresse...

Multiband condensate of magnons in two dimensions

Wavelike bosonic particles can accumulate in a single mode characterized by a particular wavelength, and such condensates are at the heart of phenomena such as superconductivity and superfluidity where usually a single complex number describes their state. If there are several fl...

Voltage‐Driven Non‐Volatile Interconversion Between Giant Single‐Domain and Multidomain Magnetic States in a Multiferroic Heterostructure

ABSTRACT Voltage control of magnetic states in multiferroic heterostructures represents a promising route toward voltage‐programmable magnetic devices. However, it remains challenging to achieve deterministic and non‐volatile electrical control of well‐defined magnetic states wit...

Atomically thin amorphous carbon with an ultralow dielectric constant

Two-dimensional (2D) materials could replace conventional electronic components. Key advances have already been made in applying 2D materials to integrated circuits, but a robust, atomically thin ultralow-k dielectric remains crucial for further circuit scaling. Minimizing parasi...

Overcoming Uncontrolled Nucleation and Cesium Salt Solubility Limits in Scalable Perovskite Deposition through All-Inorganic Perovskite Nanocrystal Seeding

Abstract Optoelectronic performance, defect density, and thin-film morphology of solution-processable lead halide perovskites are highly dependent on nucleation and growth conditions during processing. Additionally, Cs+ incorporation into the lattice can have benign effects on th...

Element-Specific DonorNumbers for Anions

Abstract Anion interactions with cations/molecules are crucial across chemistry and biology: in battery electrolytes, synthesis, atmospheric processes, and protein denaturation. Selecting the optimum anion represents an immense challenge, as anion interactions are diverse and com...

Time-resolved imaging of antiferromagnetic skyrmion interactions

Abstract Quantifying particle interactions is central to understanding and controlling collective dynamics in particle-based devices such as those comprising skyrmion ensembles. Here we directly visualize, in real time, the nanosecond current-driven dynamics of an antiferromagnet...

Self‐Assembled Mesoporous Nickel Polyphthalocyanine/Graphene Microspheres for Room‐Temperature Sensing of Carbonate Ester Leakage in Batteries

ABSTRACT The low viscosity of linear carbonate esters improves electrolyte wetting and ionic conductivity, making them essential for battery operation, but also rendering them prone to rapid evaporation when cells are mechanically damaged or leaking. Given their high flammability...