Deutsche Neutronenstreutagung

The exchange coupling in bimagnetic core-shell nanoparticles is a promising pathway to permanent magnetic materials [1]. For iron oxide core-shell nanoparticles, consisting of a wuestite-like particle core and a spinel-type shell, transition metal doping was recently shown to significantly enhance the magnetic anisotropy and exchange coupling [2]. Native iron oxide core-shell nanoparticles...

In the superconductor niobium the vortex-vortex interaction exhibits in addition to the purely repulsive also an attractive term. This leads to the formation of the intermediate mixed state (IMS) where flux-free Meissner state domains and mixed state domains filled with vortex lattice coexist separated on the micrometer length scale. Besides being a prominent example of exotic vortex matter...

RMn6Sn6 (R=Gd-Lu, and Y) family is a subject of current interest owing to its Mn-Kagome lattice, which can host exotic topological quantum states and frustrated magnetism [1]. Tuning the rare-earth ions in RMn6Sn6, where R is magnetic, can engineer the topological transport properties, including quantum oscillation and the anomalous Hall effect (AHE) [2, 3], thus indicating a close...

The spin-$1/2$ Heisenberg model on the antiferromagnetic kagome lattice is one of the fundamental models in frustrated quantum magnetism with a predicted quantum spin liquid (QSL) ground state, spinon excitations and a complex sequence of magnetization plateaus in applied magnetic fields [1-3]. From an experimental viewpoint, the mineral herbertsmithite with uniform couplings in the kagome...

Research into magnetic nanoparticles is being propelled by their promising applications across diverse fields such as medicine, biology, and nanotechnology. Numerous studies have highlighted their potential in targeted drug delivery, imaging, and hyperthermia treatment. However, assumptions about the uniformity of the magnetization distribution within nanoparticles, often made in...

Rare earth pyrochlores offer a rich landscape for discovering and studying new states of matter due to the geometrical frustration imposed by their lattice structure. A notable example is the classical spin ice state found in Dy₂Ti₂O₇ and Ho₂Ti₂O₇, which exhibits infinite degeneracy.

Even more intriguing is the concept of Quantum Spin Ice (QSI), where quantum tunneling between degenerate...