Magnetoresistance Effect in Layered-Perovskite La<sub>2-2x</sub>Ca<sub>1+2x</sub>Mn<sub>2</sub>O<sub>7</sub> Thin Films

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  • Asano Hidefumi
    Department of Materials Science and Engineering, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–01, Japan
  • Hayakawa Jun
    Department of Materials Science and Engineering, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–01, Japan
  • Matsui Masaaki
    Department of Materials Science and Engineering, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–01, Japan

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タイトル別名
  • Magnetoresistance Effect in Layered-Perovskite La2-2xCa1+2xMn2O7 Thin Films.
  • Magnetoresistance Effect in Layered-Per

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Ferromagnetic thin films of La2-2 xCa1+2 xMn2O7 (x=0.3) with a tetragonal Sr3Ti2O7-type layered perovskite structure have been deposited on MgO and SrTiO3 (001) substrates by magnetron sputtering. The epitaxial thin films in this study have the a-axis normal orientation with 90° domains having the a/c boundaries in the film plane. These thin films exhibit highly enhanced magnetoresistance (MR) effects (MR ratio Δ ρ /ρ 0 of -93% at µ 0H=1 T) compared with those reported for thin films of cubic ferromagnetic perovskite with isotropic Mn-O networks. These MR behavior can be explained by taking account of the two-dimensionality and anisotropy of the Mn-O networks in the ferromagnetic layered perovskites.

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