Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.126: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Ab Initio Calculations of Exchange Interactions in Transition Metal Oxides — •Guntram Fischer1, Arthur Ernst2, Markus Däne1, Wolfram Hergert1, Martin Lüders3, Zdzislawa Szotek3, and Walter Temmerman3 — 1Naturwissenschaftliche Fakultät II, Institut für Physik, Martin-Luther-Universität Halle-Wittenberg — 2Max Planck Intitut für Mikrostrukturphysik, Halle — 3Daresbury Laboratory, Daresbury, Warrington WA4 4AD
For the development of new materials in semi-conductor technology and spintronics it is essential to understand the magnetic effects and interactions in these systems. One method to describe the magnetic effects is to map the interactions onto an effective Heisenberg-Hamiltonian. To do so one needs to obtain the Heisenberg exchange parameters, which carry the relevant physical information about other quantities such as critical temperatures, magnetic susceptibilities, specific heat and others.
We present the results obtained by applying ab initio-methods to calculate the exchange parameters of transition metal oxides (TMO). With these results the Néel temperatures of the TMO are calculated via Mean Field Approximation, Random Phase Approximation and classical Monte Carlo simulations. The different results are compared with each other and possible future applications of the methods are shown.