Data Science

Event Gewerbeverein 2022

Lehrlingsevent 2022 wurde wieder durchgeführt

Die vier Gewerbevereine des Zurzibiet laden zum gemütlichen Lehrlingsevent ein.

LPBF Acoustic Emission

Deep learning-based monitoring of laser powder bed fusion processes

We present a novel monitoring strategy for 3D print processes that consists of developing and training a hybrid machine learning model that can classify regimes across different time scales based on heterogeneous sensing data. 

2022 KV-Abschluss

BM- und BS-Abschlussfeiern 2022

In verschiedenen Berufs- und Berufsmaturitätsschulen wurden die erfolgreichen Abschlüsse gefeiert. Wir sind stolz auf unsere Lernenden und ihre tollen Leistungen!

Weser et al

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Topological magnon insulators constitute a growing field of research for their potential use as information carriers without heat dissipation. We report an experimental and theoretical study of the magnetic ground-state and excitations in the van der Waals two-dimensional honeycomb magnet ErBr3. We show that the magnetic properties of this compound are entirely governed by the dipolar interactions which generate a continuously degenerate non-collinear ground-state on the honeycomb lattice with spins confined in the plane.

 

Feriencamp 2022

2022 Feriencamp

Dieses Jahr konnten wir mit 34 Kinder von PSI-Mitarbeitenden das Feriencamp durchführen. Dank den vielen Helfenden verbrachten die Kinder eine interessante und tolle Woche am PSI. Herzlichen Dank allen, welche diese Woche möglich machen!

2022 Mühlebach

Mühlebach

Nachdem der Mühlebach im Lehrlingslager 2019 saniert wurde, hat der Verein Kultur am Mühlebach Böttstein festgestellt, dass die Kalkablagerungen wieder zunehmen. Paula M., Lernende Chemielaborantin EFZ im 3. Lehrjahr, nahm verschiedene Messungen vor, um den Kalkgehalt im Wasser zu untersuchen.

Marco Ranocchiari

Marco Ranocchiari takes on the lead of the ESI project as of July 1st, 2022!

«I am very excited to lead a strategic project and the extraordinarily competent and innovative ESI team for PSI, to help contribute to the transition to net zero.»

DFO_Banani_072022

Role of Dy on the magnetic properties of orthorhombic DyFeO3

Orthoferrites are a class of magnetic materials with a magnetic ordering temperature above 600 K, predominant G-type antiferromagnetic ordering of the Fe-spin system and, depending on the rare-earth ion, a spin reorientation of the Fe spin taking place at lower temperatures. DyFeO3 is of particular interest since the spin reorientation is classified as a Morin transition with the transition temperature depending strongly on the Dy-Fe interaction. Here, we report a detailed study of the magnetic and structural properties of microcrystalline DyFeO3 powder and bulk single crystal using neutron diffraction and magnetometry between 1.5 and 450 K. We find that, while the magnetic properties of the single crystal are largely as expected, the powder shows strongly modified magnetic properties, including a modified spin reorientation and a smaller Dy-Fe interaction energy of the order of 10 μeV. Subtle structural differences between powder and single crystal show that they belong to distinct magnetic space groups. In addition, the Dy ordering at 2 K in the powder is incommensurate, with a modulation vector of 0.0173(5) c∗, corresponding to a periodicity of ∼58 unit cells.

Highlight_Morillo_Candas

Widely tunable two-color x-ray free-electron laser pulses

SwissFEL team has demonstrated the generation of widely tunable two-color x-ray free-electron laser (FEL) pulses with unprecedented photon energy ratio between the two colors of about three (350 and 915 eV), in addition to a tunable time separation between the two pulses from negative time delays to up to 500 fs. These new capabilities open new opportunities to study ultrafast x-ray-induced energy transfer and relaxation processes in physics, chemistry, and biology.

La_LaO_vs_press_plasma

New Insight into the Gas Phase Reaction Dynamics in Pulsed Laser Deposition of Multi-Elemental Oxides

The gas-phase reaction dynamics and kinetics in a laser induced plasma are very much dependent on the interactions of the evaporated target material and the background gas. For metal (M) and metal–oxygen (MO) species ablated in an Ar and O2 background, the expansion dynamics in O2 are similar to the expansion dynamics in Ar for M+ ions with an MO+ dissociation energy smaller than O2. This is different for metal ions with an MO+ dissociation energy larger than for O2. This study shows that the plume expansion in O2 differentiates itself from the expansion in Ar due to the formation of MO+ species. It also shows that at a high oxygen background pressure, the preferred kinetic energy range to form MO species as a result of chemical reactions in an expanding plasma, is up to 5 eV.

igor_inorganic_chemistry_2022

Competing Magnetic Phases in LnSbTe (Ln = Ho and Tb)

The interplay between a topological electronic structure and magnetism may result in intricate physics. In this work, we describe a case of rather peculiar coexistence or competition of several magnetic phases below seemingly single antiferromagnetic transition in LnSbTe (Ln = Ho and Tb) topological semimetals, the magnetic members of the ZrSiS/PbFCl structure type (space group P4/nmm). Neutron diffraction experiments reveal a complex multi-step order below TN = 3.8 K (Ln = Ho) and TN = 6.4 K (Ln = Tb). Magnetic phases can be described using four propagation vectors k1 = (1/2 0 0) and k2 = (1/2 0 1/4) at a base temperature of 1.7 K, which transform into incommensurate vectors k1′ = (1/2 – δ 0 0) and k3 = (1/2 – δ 0 1/2) at elevated temperatures in both compounds. Together with the refined models of magnetic structures, we present the group theoretical analysis of magnetic symmetry of the proposed solutions. These results prompt further investigations of the relation between the electronic structure of those semimetals and the determined antiferromagnetic ordering existing therein.

cvjetinovic_djordje

Welcome Đorđe

We are happy to welcome Dr Đorđe Cvjetinović. 

Đorđe will be working on the SINCHRON project as part of his postdoctoral fellowship.

tecday_2022-45_jan

TFI goes TecDays

In July 2022, two PhDs of our Thin Films and Interfaces (TFI) Group offered a practical teaching module to pupils at the Kantonsschule Stadelhofen as part of the Swiss TecDays. These are one-day events at Swiss grammar schools, organized by the Schweizerische Akademie der Technischen Wissenschaften (SATW), to support and strengthen technology education at schools. By bringing together pupils and experts from industry, universities, or research institutions, TecDays aims to raise an early awareness for technology and science.

SNSS YSP

Stephan Allenspach received the SNSS Young Scientists Prize

Congratulations to Stephan Allenspach for receiving the Young Scientist Prize of the Swiss Neutron Scattering Society for his outstanding PhD thesis. Stephan did his PhD in the Quantum Criticality and Dynamics Group lead by Christian Rüegg.

Event display of a cosmic muon track in the Mu3e vertex detector

Cosmic Run at PSI

We assembled a Mu3e vertex detector prototype and a ribbon of the fibre detector with their associated data acquisition (DAQ) at PSI. This setup was used to develop commissioning and tuning procedures for the sensors, advance DAQ integration, develop user interfaces, check timing and finally to detect cosmic ray muons passing through the set-up.

Cover of nature nanotechnology March 2018

MARVEL team wins inaugural PRACE HPC Excellence award

The first ever PRACE (Partnership for Advanced Computing in Europe) HPC Excellence Award has been awarded to a team led by Professor Nicola Marzari, head of Theory and Simulation of Materials at EPFL's School of Engineering and Materials Simulations at PSI, and director of NCCR MARVEL. The € 20,000 award is given to “an outstanding individual or team for ground-breaking research that leads to significant advances in any research field through the usage of high-performance computing”, and recognizes the team’s effort in the discovery and characterization of novel two-dimensional materials.

Lehrberufe à la Carte

Lehrberufe à la Carte 2022

Erneut konnten wir vielen interessierten Besucherinnen und Besucher am Sonntag, 26. Juni 2022 unsere Berufsbildung vorstellen und ihnen ihre Fragen beantworten.

 

UCN LTP

Seeking the sensational on a small scale

The Swiss Research Magazine 'Horizons' features particle physics performed at PSI.