Current News

May 2024
Roadmap on Nanoscale Magnetic Resonance Imaging Published

On the 14th, Nanotechnology published a ‘roadmap’ article nanoscale magnetic resonance imaging (NanoMRI). The work is entitled, Roadmap on nanoscale magnetic resonance imaging. It reports on the current state of the art in NanoMRI technologies, it outlines the areas where they are poised to have impact, it identifies the challenges that lie ahead, and it proposes methods to meet these challenges. Prof. Raffi Budakian (Waterloo) led the team putting together the article, which included Prof. Amit Finkler (Weizmann) and Prof. Alex Eichler (ETHZ). Prof. Poggio contributed the first chapter on magnetic resonanance force microscopy.

Prof. Poggio in Leoben

On the 13th, Prof. Poggio visited the lab of Prof. Aleksandar Matkovic at the Montanuniversität in Leoben, Austria. Along with touring the labs and discussing with Prof. Matkovic and his colleagues about an ongoing collaboraiton, Prof. Poggio gave a seminar entitled, “Scanning SQUID-on-tip microscopy of 2D and chiral magnetism “.

April 2024
Prof. Aleksandar Matkovic Visits

Prof. Aleksandar Matkovic from the Montanuniversität in Leoben, Austria visited from on Monday the 29th. He gave a talk at the Quantum & Nano Seminar on Monday afternoon entitled, “Sheet silicate clays as functional gate insulators for two dimensional materials-based electronics”. He also visited our lab and spent time discussing an ongoing collaboration with members of the group.

Andriani and Daniel in Valencia

From the 21st to the 25th, Ph.D. students Andriani Vervelaki and Daniel Jetter attended the “European School on Superconductivity and Magnetism in Quantum Materials” in Valencia, Spain. The school provided a comprehensive series of foundational lectures, while also delving into the latest developments in the fields of superconductivity and magnetism. Cutting-edge advancements within these interdisciplinary fields were also discussed, as well as the synergies between superconductivity and magnetism.

Ph.D. Student Joins group

On the 10th, Antonella Restino joined the group as a Ph.D. student. Antonella received her Bachelor of Science in Physics in 2020 from University of Campania Luigi Vanvitelli in Italy. She went on to get her Masters degree in Physics in 2023 from the University of Naples Federico II under Profs. Tafuri and Massarotti. She has now moved to Basel for her Ph.D. Welcome!

March 2024
Visit of Laura Heyderman

On the 22nd, Prof. Laura Heyderman from the PSI and ETH Zürich visited our department to give the Colloquium on the invitation of Prof. Poggio. Her talk was entitled, “Recent advances in artificial spin ice”. Prof. Heyderman spent the day in the Deparment and visited the group to discuss ongoing research.

High-school students visit lab

On the 21st, students in the final year of a high school from the Istituto d’Istruzione Superiore “James Clerk Maxwell” in Milano, Italy visited the department, on the invitation of Prof. Ilaria Zardo. As part of the visit, 2 groups of the 49 students were given a tour of our lab by post-doctoral researcher Dr. Francesco Fogliano, Ph.D. student Aris Lafranca, and Prof. Poggio. Further tours included the labs of Prof. Philipp Treutlein and Prof. Ilaria Zardo.

Paper on Magnetic Imaging of 2D Cr2Ge2Te6 Published

On the 19th, Communications Materials published our article entitled, Visualizing thickness-dependent magnetic textures in few-layer Cr2Ge2Te6. Therein we describe magnetic imaging experiments on few-layer Cr2Ge2Te6 using a combined scanning superconducting quantum interference device and atomic force microscopy probe. Maps of the material’s stray magnetic field as a function of applied magnetic field reveal its magnetization per layer as well as the thickness-dependent magnetic texture. Using a micromagnetic model, we correlate measured stray-field patterns with the underlying magnetization configurations, including labyrinth domains and skyrmionic bubbles. By Comparing between real-space images and simulations, we demonstrate that the layer dependence of the material’s magnetic texture is a result of the thickness-dependent balance between crystalline and shape anisotropy. These findings represent an important step towards 2D spintronic devices with engineered spin configurations and controlled dependence on external magnetic fields.

The study was led and carried out by former post-doctoral researcher Dr. Kousik Bagani and Ph.D. students Andriani Vervelaki and Daniel Jetter. Research scientist Dr. Boris Groß provided input on the micromagnetic simulations. Samples were fabricated by members of the group of Prof. Peter Bøggild (DTU). Prof. Dennis Christensen (DTU) initiated the collaboration.

Roadmap on Magnetic Microscopy Published

On the 8th, Journal of Physics: Materials published a ‘roadmap’ article, in which experts in different areas of magnetic microscopy provide their views on the current capabilities of available techniques, forecast future advances, and assess how such advances may impact materials science. The work is entitled, 2024 Roadmap on Magnetic Microscopy Techniques and Their Applications in Materials Science. The focus of the article is on material science and physics. Prof. Dennis Christensen (DTU) led the team putting together the article, which included Dr. Urs Staub (PSI), Prof. Nini Pryds (DTU), Prof. Denys Makarov (HZD Dresden), and Prof. Poggio.

February 2024
New Masters Students

Early this year, 3 new students have joined the group to pursue their Masters theses: Loris Durante, Katharina Kress, and Moritz Haberthür. Both Loris and Katharina have already worked in the group as part of one of their Masters projects. We welcome all three to the group and wish them luck on their projects!

Party for Kousik

On the 23rd, the group held a farewell party for Dr. Kousik Bagani, who will be leaving the group at the end of the month. Kousik joined the group in the midst of the COVID-19 pandemic in October 2020, after a post-doc in the lab of Prof. Eli Zeldov (Weizmann). Since then, he has led our efforts on developing SQUID-on-lever probes and applying them to the study of 2D magnets. He has also helped manage our FIBsuperProbes collaboration, taking over for Dr. Marcus Wyss. Kousik is now moving to Munich to start a job at Attocube AG. We wish him the best of luck in this new adventure and hope to continue working with him for a while longer on the projects he started. His contributions to the group — scientific and otherwise — will be missed by all!

NW MFM of bilayer EuGe2

On the 15th, Nanoscale published our article entitled, Mapping the phase-separated state in a 2D magnet, as an “accepted manuscript” before the final edited and formated version appears. In the paper, we employ a high-sensitivity magnetic force microscopy (MFM) technique, using a nanowire (NW) transducer, to probe the spatial distribution of magnetic states in the paradigmatic 4f 2D ferromagnet EuGe2. Below the ferromagnetic transition temperature, we discover the phase-separated state and follow its evolution with temperature and magnetic field. The characteristic length-scale of magnetic domains amounts to hundreds of nanometers. These observations strongly shape our understanding of the magnetic states in 2D materials at the monolayer limit and may contribute to engineering of future ultra-compact spintronic devices.

The research was carried out in our group by former Ph.D. student Dr. Hinrich Mattiat and current Ph.D. student Lukas Schneider, who did the MFM. The collaboration included Ph.D. student Patrick Reiser (Basel) and members of the Budakian group (University of Waterloo), who provided the NW MFM transducers. Members of the group of Prof. Vyacheslav Storchak (Kurchatov Institute) grew the EuGe2 samples, carried out experiments using complementary techniques, and did analysis of the measurements. 

Scanning NV Magnetometry of Nanomagnets

On the 7th, ACS Applied Nano Materials published our article entitled, Scanning Nitrogen-Vacancy Magnetometry of Focused-Electron-Beam-Deposited Cobalt Nanomagnet. The work discusses the patterning of nanomagnets via focused-electron-beam-induced deposition (FEBID).  We report on the fabrication of cobalt nanomagnets and characterize their content, saturation magnetization, and stray magnetic field profiles, using a combination of transmission electron microscopy and scanning nitrogen-vacancy magnetometry. We find agreement between the measured stray field profiles and saturation magnetization with micromagnetic simulations. We further characterize magnetic domains and grainy stray magnetic fields in the nanomagnets and their halo side-deposits. The published work may aid in the evaluation of such nanomagnets for applications in spin qubits, magnetic field sensing, and magnetic logic.

The research was carried out by Ph.D. student Liza Žaper and the project was led by research scientist Dr. Floris Braakman. Research scientist Dr. Boris Groß helped with magnetic simulations. The work also benefitted from close collaborations with Dr. Peter Rickhaus (Qnami), Dr. Marcus Wyss (Nano Imaging Lab, Swiss Nanoscience Institute), and Dr. Kai Wagner (Maletinsky group, Department of Physics, University of Basel).

January 2024
Swiss Quantum Days

From the 31st to February 1st, Prof. Poggio attended the first two days of the second edition of the Swiss Quantum Days in Villars-sur-Ollon, Switzerland. The conference focused on quantum materials, quantum sensing, quantum information, and quantum computation and included a number of prominent researchers in the field based in Switzerland.

Group Members at Nano in the Snow

From the 17th to the 19th, Ph.D. students Lukas Schneider, Luca Forrer, Mathias Claus, and Prof. Poggio attended this year’s edition of Nanoscience in the Snow, which was held at the Hotel Mont Paisible in Crans-Montana, Switzerland. Each presented a poster and Prof. Poggio gave a talk entitled, “Using nanomechanics to study nanomagnetism”.

Joe Wilcox Visits

From the 9th to the 11th, Dr. Joe Wilcox from the University of Bath, UK visited our group. Joe is an experimental physicist working on understanding the fundamental physics of unconventional superconductivity in the group of Prof. Simon Bending. Post-doctoral researcher Dr. Estefani Marchiori and Ph.D. student Lukas Schneider have started a collaboration with Joe.