Regensburg 2007 – wissenschaftliches Programm
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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 15.102: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Magnetic and electronic properties of half-metallic ferromagnetic Mn-stabilised zirconia — •Igor Maznichenko1, Arthur Ernst2, Lars Bergqvist3, Sergey Ostanin2,4, Leonid Sandratskii2, Patrick Bruno2, Markus Däne1, Ian Hughes4, Julie Staunton4, Wolfram Hergert1, Ingrid Mertig1, and Josef Kudrnovsky2,5 — 1Martin-Luther-Univ Halle-Wittenberg, Inst Phys, 06099 Halle, Germany — 2Max-Planck-Inst Mikrostrukturphys, Weinberg 2, 06120 Halle, Germany — 3Dept Phys, Uppsala Univ, Box 530, 751 21 Uppsala, Sweden — 4Dept Phys, Univ Warwick, Coventry CV4 7AL, UK — 5Inst Phys, Acad Sci of the Czech Republic, Na Slovance 2, 18221 Prague 8, Czech Rep.
The investigations of the manganese stabilised cubic zirconia (Mn-SZ) show that this dilute magnetic semiconductors possess unique magnetic properties. Based on ab-initio electronic structure calculations which include the effects of thermally excited magnetic fluctuations, the autors predict Mn-SZ to be ferromagnetic for a wide range of Mn concentration up to high TC. It was found that this material, which is well known both as a diamond imitation and as a catalyst, is half-metallic with majority and minority spin states of the Mn impurities lying in the wide band gap of zirconia. The high TC ferromagnetism is robust against oxygen vacancies and against the distribution of Mn impurities on the Zr fcc sublattice. This work responds to the question concerning the key electronic and structure factors behind an optimal doping. The autors propose this stable half-metallic ferromagnet to be a promising candidate for future spintronics applications.