Skip to ContentSkip to Navigation
About usNews and EventsNews articles

Exotic magnetic phenomena in transition metal materials

18 December 2009

Promotie: T.T.A. Lummen, 11.00 uur, Academiegebouw, Broerstraat 5, Groningen
Proefschrift: Exotic magnetic phenomena in transition metal materials
Promotor(s): prof.dr. P.H.M. van Loosdrecht
Faculteit: Wiskunde en Natuurwetenschappen
Contact: Tom Lummen, tel. 050-363 4352, e-mail:

Exotic magnetic phenomena in transition metal materials

Even today, magnetism remains one of the fundamental areas of interest within the materials science community. This is because revolutionairy new effects related to the magnetic interactions in materialen are still being discovered. The mutual couplings between microscopic lattice, spin, orbital and charge degrees of freedom in materials result in a complex equilibrium that, in special cases, can lead to fascinating new phenomena such as the recently discovered giant magnetoresistance and high-temperature superconductivity. The research described in this thesis focuses on a number of these special cases, in which the magnetism of the studied materials exhibits unusual behaviour. In general, two classes of materials are discussed, in which optically-controllable magnetism and geometrically frustrated magnetism are investigated, respectively.

In the first chapters, the spotlight is on one of the so-called Prussian Blue Analogues, in which an internal redox reaction can be induced through both temperature and light, thereby drastically changing its magnetism. Because these fascinating transition phenomena were found to be accompanied by cooperative interactions between the involved magnetic units, it was proven to be possible to switch the macroscopic magnetism in the material at low temperature using visible light.

The later chapters focus on a number materials whose specific structure prevents the satisfaction of their primary magnetic interactions; geometrically frustrated materials. Because of this precarious situation, it are the secondary interactions in the material that dominate the (unusual) magnetic behavior; the crystal field splitting and the spin-lattice coupling were shown to be dominant in the respective studied systems.

Last modified:15 September 2017 3.39 p.m.

More news

  • 02 April 2019

    ‘Sense of loss drives voting behaviour’

    ‘Everybody here loves that academia has returned to Friesland. We teach, carry out research and think along about solutions to problems that are relevant for Friesland,’ says Caspar van den Berg, Professor of Global and Local Governance at the UG Campus...

  • 29 March 2019

    Royal Decoration for Prof. Jeff De Hosson

    On Friday 29 March, Prof. J.Th.M. De Hosson has been awarded the Royal Decoration of Knight of the Order of the Dutch Lion. He was presented with this decoration by acting Mayor Koos Wiersma of the Westerkwartier municipality directly after his valedictory...

  • 27 March 2019

    Local levies for home owners rise by 2.7%

    Households that own their own homes will on average pay 2.7% more in municipal, provincial and water board taxes. Municipal taxes are set to rise by 3.5% on average, the water rates by 2.3% and the provincial taxes by 0.3%. This is revealed by the Atlas...