The elementary excitations of magnets are called spin waves, and their corresponding quasi-particles are known as magnons. The rapidly growing field of Magnonics aims at using them as information carriers in a new generation of electronic devices, (almost) free of electric currents.

Promotor: Prof.dr. H. J. A. Röttgering, Co-Promotor: Dr. M. Haverkorn

Promotor: H.J.A. Röttgering, Co-promotor: M. Haverkorn

Promotor: Prof.dr.ir. J.W.M. Hilgenkamp, Prof.dr. J. van den Brink

Our cantilevers have a low intrinsic damping rate: this enables us to measure with low noise, since damping is proportionate to noise. However, when the magnet is close to the surface of a sample we want to study, we measure a much higher effective damping rate. This is caused by magnetic interaction…

Alzheimer's disease (AD) is the most frequent neurodegenerative disorder and the primary cause of dementia. The neuropathological features of AD include the occurrence of senile plaques, neurofibrillary tangles, decreased synaptic density, and loss of neurons. An obstacle in the study and treatment…

In this thesis, we describe the latest advances in SQUID-detected Magnetic Resonance Force Microscopy (MRFM).

In this thesis, we show how MRFM can usefully contribute to the field of condensed-matter.

In the Aarts lab we combine or structure materials, mostly in thin film form, in such a way that the hybrid has different and novel properties or functionalities.

Promotor: T.H. Oosterkamp

Advances in the field of high-performance Nd-Fe-B permanent magnets, by re-engineering their microstructure to make them more powerful while reducing rare earth content.

Promotores: Prof.dr. J. Aarts, Prof.dr. J.M. van Ruitenbeek

The demand for neodymium-iron-boron (NdFeB) magnets is rapidly growing, while the neodymium supply chain is under pressure. Recycling can alleviate these issues. This thesis investigates the potential for deploying novel magnet recycling technologies and their environmental consequences.

Promotor: H.J.M. de Groot, Co-Promotor: A. Alia

In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.

Make more fluid: In condensed matter systems, electrons can acquire unusual properties from their interaction with the atomic lattice.

The main focus of this thesis is the behaviour of two-dimensional materials, namely (anti)-ferromagnetic materials in the first two chapters, which show topological phases, and energetic square ice in the third and fourth chapter.

On the largest scale, the Universe resembles a cosmic spiderweb. Most galaxies coexist in small groups within the threads of this web. At the nodes of the threads are enormous groups of galaxies forming the largest structures in the universe still held together by gravity: clusters of galaxies.

Zebrafish is an excellent model organism for studying various human diseases. Due to opaqueness of the adult phase, in vivo studies are restricted to early embryonic stages. This raises the need for rapid sensitive and non-invasive in vivo imaging methods to follow developmental processes, not only…

Ferritin is a spherical metalloprotein, capable of storing and releasing iron in a controllable way. It is composed of a protein shell of about 12 nm and within its cavity, iron is stored in a mineral form.

Analecta Praehistorica Leidensia is the annual journal of the Faculty of Archaeology (formerly the Institute of Prehistory), Leiden University.

A deceptively simple, complicated paper

Northern lights, stellar winds and exoplanets. This is what astronomer's PhD research revolved around. PhD candidate astronomer Rob Kavanagh developed mathematical models to better understand the interactions between exoplanets and stellar winds and to define features of exoplanets. He will receive…

82 years ago Queen Wilhelmina fled to England. Henk te Velde tells about her on the Australian radio show 'Nightlife'.

Nikie Veld is an education coordinator at Biology. Her job now mainly revolves around getting students back to the Faculty. ‘In the corona era, we were constantly rearranging the timetables.’

Promotor: A. Achúcarro, Co-promotor: A. Boyarsky

You can still enroll for the master Magnetic Resonance Physics course. It starts at Monday, Nov. 13th 13:30 in HL 226. For more information go to https://studiegids.leidenuniv.nl/courses/show/76629/magnetic-resonance-physics

Prof.dr. Henk te Velde is appointed as the new President of the Association for Political History.

Professor Henk te Velde started as interim dean of the Faculty of Humanities on 1 March. Mark Rutgers' successor is faced with the task of getting the faculty back to financial health.

Advanced UHF MRI techniques provide powerful tools for studying the zebrafish brain, an emerging model in neurological research. In this work, various MRI and localized MRS methods are optimized and employed for UHF strength for studying the zebrafish brain.

This thesis investigates the relations between metabolism and anatomy through the use of Magnetic Resonance Imaging (MRI).

Is it possible to measure subtle oscillations caused by dark matter moving through the earth? A Dutch-American physicist team have discovered a new route toward what could be the first-ever measurement of ultralight dark matter. They suspended a microscopic magnet inside a superconducting enclosure,…

Are magnetic fields older than the first light? And how did they influence the development of our universe right after the Big Bang? Cosmologists from Leiden, Groningen, and Utrecht are now collaborating to investigate this.

Professor of Dutch History prof.dr. H. (Henk) te Velde will become interim Dean of the Faculty of Humanities at Leiden University for a two-year term with effect from 1 March 2025. He will succeed prof.dr. M.R. (Mark) Rutgers. Mark Rutgers’ second term of office expires on 1 March 2025; he will be professor…

First author Rubin Dasgupta, PhD student at the Biophysical Organic Chemistry & Macromolecular Biochemistry groups at the Leiden Institute of Chemistry has made the cover of the June edition of Solid State Nuclear Magnetic Resonance.

Light-Harvesting Complex II (LHCII) is responsible for light absorption and excitation energy transfer in plants and photosynthetic algae, while in high light it undergoes conformational changes by which it quenches excitations to prevent photodamage.

Triplet superconductivity refers to a condensate of equal-spin Cooper pairs (pairs of electrons with equal spin).

Promotor: Prof.dr. T. Schmidt, Co-promotor: Dr. ir. S. J.T. van Noort