With its compact design, large double-focus monochromator and wide-angle polarization analysis, DNS is optimized as a high intensity cold-neutron polarized instrument. Major instrument upgrades, including a new-generation Fe/Si supermirror based focusing polarizing bender [1], and a 300 Hz disc chopper system, have been accomplished recently. This has opened up possibilities to combine...
Because of its multivalent Co states and high oxygen mobility SrCoO$_{3-\delta}$ (SCO) is a promising material for energy and spintronic applications [1]. Upon changing its oxygen content it exhibits a topotactic phase transition. While SrCoO$_3$ is a ferromagnetic metal (T$_C$=305 K) with perovskite structure,
SrCoO$_{2.5}$ is an antiferromagnetic insulator(T$_N$ =570 K) with brownmillerite...
(Note: the contribution is based on results obtained while the presenter was employed by TUM.)
Thin magnetic films and heterostructures are the basic building blocks of many electronic information and quantum technology devices. Because sample structure, stoichiometry, and defect population are defined by and evolve with the deposition process of the structures, a precise control and...
The so-called Guinier law represents the low-$q$ approximation for the small-angle scattering curve
from a dilute assembly of identical and randomly oriented particles. This relation has been derived
for nonmagnetic particle-matrix-type systems; an important prerequisite for it to apply is the
presence of a sharp interface separating particles and matrix. On the other hand, it is well
known...
Alloys of rare-earth elements and 3d transition metals became recently again in the focus of attention due there rich variety of magnetic effects owed to the different anisotropies of both material classes.
In this work, various thin film systems containing the amorphous DyCo alloy will be discussed. Despite of their amorphous nature, the film system show non trivial magnetic ordering leading...
Pyrochlore Nd2Zr2O7 was found to have very special magnetic ground state in which there is a coexistence of dynamical spin-ice correlations and quantum moment fragmentation due to the dipolar-octupolar doublet ground state of Kramers Nd3+ ion. Through 1:1 mixing of Sc3+ and Ta5+ in B sites, the crystal field ground state of Nd3+ can be strongly affected, and the magnetic ground state of...
Investigations of magnetic excitations focus on new magnetic materials, quantum magnetism, superconductivity, heavy-fermion or low-dimensional systems, frustrated and multiferroic materials. The challenges of high-resolution studies can be answered only by cold neutron (TAS) spectroscopy experiments.
In our days, there is a trend for extreme conditions, searching for exotic spin states. The...