10:00 to 11:00 Micromagnetism - some current challenges faced by experimentalistsSession: Computational Electromagnetism Small magnetic structures play a crucial role in modern storage devices and sensors. To achieve ever improving performance, magnetic films with superior properties and smaller (and frequently more densely packed) magnetic elements are required. When experimenting with new magnetic systems the ideal would be to have a description of the magnetisation distribution throughout the 3-dimensional magnetic system and to understand how it evolves as a function of vector field, temperature and time. Resolution as close as possible to the atomic level, and in any event better than characteristic magnetic length scales, is also highly desirable. Despite the rapid development of existing and the introduction of new magnetic microscopy techniques over the last decade, we still fall far short of these goals. In this talk, I will give examples of some recent imaging investigations with equal emphasis on the information that they do and do not provide. Among the topics to be discussed will be the extent to which the properties of notionally identical magnetic elements differ as a result of small differences in their physical microstructure. This can be quite complex in elements comprising a single magnetic layer but is inevitably much more so in multilayers where the detailed coupling between the layers themselves remains imperfectly understood. Further challenges arise when the elements are packed closely together as interactions between them become important. Other significant topics are the effect of thermal processes leading to property changes with time, all other parameters remaining constant. Studies of this nature relate, for example, to stability and hence the suitability of particular structures for storage purposes. At the other end of the time spectrum is the phenomenon of ultra-fast switching where it is difficult to simultaneously meet the requirements of high spatial and temporal resolution. I will discuss how combining information gleaned from experiment and micromagnetic modelling can help to advance the subject. INI 1 11:00 to 11:30 CoffeeSession: Computational Electromagnetism 11:30 to 12:30 Time and length scales in computational microgeneticsSession: Computational Electromagnetism Micromagnetics is a continuum theory to describe magnetization processes on a length scale which is large enough to replace the atomic spins by a continuous magnetization vector and small enough to resolve the magnetization transition inside a domain wall. The characteristic length scale, the domain wall witdh, is in the order of five to ten nanometers, The size of the basic structural units of magnetic devices like sensor or storage elements may extend towards micrometers. The time scale range from sub-nanosecond regime for fast precessional switching to years for thermally activated magnetization reversal. The wide range of time and length scales involved in micromagnetic simulations is a challenge for effective computational tools. In the talk numerical methods for the solution of the LLG equation and the simulation of thermal stability will be reviewed. In particular, the role of the physical microstructure on hysteresis properties will be discussed, and numerical techniques to treat microstructural effects will be proposed. INI 1 12:30 to 14:00 LunchSession: Computational Electromagnetism 14:00 to 15:00 A Prohl ([Zürich])Numerical Analysis of stationary and nonstationary micromagnetismSession: Computational Electromagnetism Magnetic patterns of ferromagnetic materials are described by the well-accepted model of Landau and Lifshitz. Over the last years, different strategies have been developed to tackle the related non-convex problem: direct minimization, convexification, and relaxation by using Young measures. Nonstationary ferromagnetic effects are considered by the extended model of Landau, Lifshitz and Gilbert (LLG). In the talk, we survey numerical analysis for solving the stationary problem. In the second part, we discuss proper projection/penalization strategies to discretize (LLG). INI 1 15:00 to 15:30 TeaSession: Computational Electromagnetism 15:30 to 16:15 Weak and regular solutions for Landau-Lifschitz equations: existence and asymptotic behaviourSession: Computational Electromagnetism In this talk, we describe existence results for weak and regular solutions of Landau-Lifschitz equations. Furthermore, we present two types of asymptotic behaviour : for large time, we study the $\omega$-limit set of the weak solutions. On the other hand, we perform an asymptotic expansion of the regular solutions when the exchange coefficient goes to zero : it appears a boundary layer described with a BKW method. INI 1 16:15 to 17:00 P Monk ([Delaware])An eddy current-micromagnetic model with application to disk write headsSession: Computational Electromagnetism INI 1 17:00 to 18:00 Wine and Beer ReceptionSession: Computational Electromagnetism