Login

The Influence of Confinement on Phase Transitions (Part 1)

15 February 2010 to 1 March 2010
Europe/Stockholm timezone

Contribution List

27 out of 27 displayed
Export to PDF
  1. 251. Introduction and Setting the Stage
    Prof. Björgvin Hjörvarsson (Uppsala University)
    15/02/2010, 11:00
    Give a thorough description of the experimental results concerning dimensionally confined magnetic systems.
    Go to contribution page
  2. 255. Critical Temperatures of Finite Samples at Finite Observation Times
    Dr Elena Vedmedenko (University of Hamburg)
    15/02/2010, 14:00
    The correlation function is an essential ingredient of any theory of phase transitions, covering electronic systems, liquids or magnets, since it provides direct information on critical properties of a system. With the Ornstein-Zernike law its general analytical form is known for infinite systems at infinite observation times, above the critical temperature. However, important...
    Go to contribution page
  3. 257. Magnon Softening in a ferromagnetic monolayer
    Dr Anders Bergman (Uppsala University)
    16/02/2010, 10:00
    We study the Fe/W(110) monolayer system through a combination of first principles calculations and atomistic spin dynamics simulations. We focus on the dispersion of the spin waves parallel to the [001] direction. Our results compare favorably with the experimental data of Prokop et al. [Phys. Rev. Lett. 102, 177206], and correctly capture a drastic softening of the magnon...
    Go to contribution page
  4. 252. Confinement and Ordering
    Prof. Peter Holdsworth (Ecole Normale Supérieure de Lyon)
    16/02/2010, 13:00
  5. 256. Structure modifications in ultra thin films of transition metal oxides
    Dr Holger Meyerheim (Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany)
    17/02/2010, 11:00
    The talk reviews recent studies on the geometric structure of oxide films in the ultra thin film limit and their implications on their magnetic (multiferroic) properties. In a first example the structural phase transition in pure and Cobalt-doped ZnO-film is discussed. Depending on film thickness a transition from the bulk Wurtzite (WZ)- type structure to the...
    Go to contribution page
  6. 253. Phase Transitions and Critical Phenomena
    Prof. Steve Bramwell (University College London)
    17/02/2010, 14:00
  7. 258. Quantum critical points via gravity
    Lárus Thorlacius (Nordita)
    17/02/2010, 15:00
  8. 259. The effect of geometric constraints on the spin glass transition in binary pyrochlores
    Dr Simon Banks (University College London)
    18/02/2010, 10:00
    Recent neutron scattering experiments [1] have sharpened the picture of an algebraic spin liquid phase in CsNiCrF6, originally proposed by Zinkin et al. [2]. Anderson famously predicted that systems such as this, with equal numbers of two magnetic species populating a pyrochlore lattice, should favour configurations with two of each type of ion present on every...
    Go to contribution page
  9. 260. Phase transitions with disorder
    Prof. Mats Wallin (Theoretical Physics KTH)
    18/02/2010, 11:00
    Disordered systems often display new emergent phases and phase transition, for example, spin glasses and similar states in quantum fluids with disorder. Other examples where confinement effects play an important role are given by porous matter. Experiments on such systems often indicate strong finite size effects that need to be understood. We use an approach involving Monte Carlo...
    Go to contribution page
  10. 254. Dipolar Systems
    Prof. Patrik Henelius (KTH Royal Institute of Technology)
    18/02/2010, 14:00
    Due to the long range and angular dependence of the dipolar interaction sample shape plays a crucial role in determining the ordered state of magnetic materials where long-range interactions are important. This should also apply to magnetic mulitlayer systems and I propose studying the effects of the often neglected dipolar interaction in these novel materials.
    Go to contribution page
  11. 261. Methods in simulations
    18/02/2010, 15:00
  12. 263. Hunting for monopoles in spin ice
    Prof. Peter Holdsworth (Ecole Normale Supérieure de Lyon)
    19/02/2010, 10:15
  13. 276. Discussion
    19/02/2010, 11:15
  14. 262. Magnetricity in Spin Ice
    Prof. Steve Bramwell (University College London)
    19/02/2010, 13:15
  15. 277. Discussion
    19/02/2010, 14:15
  16. 264. Future Perspectives
    19/02/2010, 15:00
  17. 265. A family of critical models in d-dimensions
    Dr Simon Banks (University College London)
    22/02/2010, 13:15
    It is well known that the order parameter for the 2dXY model is zero in the thermodynamic limit, yet it remains measurable even for macroscopic systems. Thus our ability to observe the KT transition via changes in the magnetization is a result of the "confinement" of the system to finite size. We have been working on a family of related models in one and three-dimensions...
    Go to contribution page
  18. 266. The p,q-binomial distribution applied to the finite-size Ising model
    Dr Per Håkan Lundow (KTH Royal Institute of Technology)
    22/02/2010, 14:15
  19. 267. Simulation of long time scale evolution in solids
    Prof. Hannes Jonsson (University of Iceland)
    23/02/2010, 10:15
  20. 268. Magnetic X-ray scattering (part I)
    Dr Tom Hase (University of Warwick)
    23/02/2010, 13:15
  21. 269. Phase Transitions and Dimensionality
    Prof. Robin Stinchcombe (University of Oxford)
    24/02/2010, 10:15
  22. 270. First principles theory of magnetism and magnetisation dynamics
    Prof. Olle Eriksson (Uppsala University)
    24/02/2010, 13:15
    In the talk I will review some recent results on first principles theory of magnetism and magnetic materials. In particular, results of giant magnetic anisotropies will be described, and I will put some emphasis on technological aspects of this property. I will also describe recent developments in theory of spin-dynamics and how this reproduces observations on thin-film...
    Go to contribution page
  23. 271. The role of higher multipoles in magnetically ordered systems
    Dr Lars Nordström (Uppsala University)
    24/02/2010, 14:15
    In most magnetic phase transitions the focus is on the lowest multipole, the dipole which is directly related to the magnetic moment. We will in this work argue that in some cases higher order multipoles are driving the transition and the dipole is a secondary effect. The concept of spherical tensors or multipoles of an open atomic shell is first reviewed and discussed.Some of...
    Go to contribution page
  24. 272. Infulence of the range of interaction in thin magnetic structures
    Andrea Taroni (Uppsala University)
    25/02/2010, 10:15
    The properties of ultrathin magnetic structures are influenced by many length scales that reflect both generic physics and chemical detail. A striking example is the experimentally determined shift of the critical temperature as a function of film thickness. While all systems experience a pronounced suppression in Tc with decreasing film thickness, the magnitude of this shift...
    Go to contribution page
  25. 273. Software Development
    25/02/2010, 13:15
    Open forum
    Go to contribution page
  26. 274. Magnetic scattering from structured surfaces
    Dr Tom Hase (University of Warwick)
    26/02/2010, 10:15
  27. 275. Discussions and Future Perspectives
    Prof. Björgvin Hjörvarsson (Uppsala University)
    26/02/2010, 11:15