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Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.44: Poster

Tuesday, March 24, 2009, 10:15–13:00, P1A

Ferromagnetic order above room temperature in cubic Y-stabilized ZrO2 by Fe-implantation — •Monika Kotzian, Dirk Menzel, and Joachim Schoenes — Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany

Diluted magnetic oxides have attracted much interest when room-temperature ferromagnetism was observed e. g. in transition metal doped TiO2 and SnO2. Recently, ferromagnetic order with Curie temperatures far above 300 K was also predicted in ZrO2 when it is doped with magnetic transition elements [1]. For an experimental verification of this prediction single crystalline Y-stabilized ZrO2 was doped with Fe using the ion-implantation technique at high doses leading to Fe concentrations up to 7 at.%. This method was chosen in order to prevent the clustering of the magnetic ions. Due to the implantation the ZrO2 crystals show a brownish color. However, the fundamental band gap of 4.08 eV, which was determined using optical spectroscopy, does not change significantly on doping within the investigated Fe concentration range. The ZrO2 crystals doped with 7 at.% Fe order ferromagnetically with an ordered moment per Fe atom of 0.30 µB at 10 K and 0.25 µB at room temperature. Upon annealing the brownish color vanishes and the ordered moment decreases. This leads to the interpretation of a polaron-mediated magnetic exchange interaction.

[1] S. Ostanin et al., Phys. Rev. Lett. 98, 016101 (2007).

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