In-plane magnetic anisotropy of La0.7Ca0.3MnO3 film grown on (0001) sapphire

Pb06Sr04TiO3/La07Sr03MnO3/La07Ca03MnO3 (PST/LSMO/LCMO) film is grown on Si substrate by chemical solution deposition method The film crystallizes perfectly into perovskite phases with a random crystalline orientation The La07Sr03MnO3/La07Ca03MnO3/Si layer exhibits low resistivity and obvious negative magnetoresistivity (MR); the PST/LSMO/LCMO film shows notable magnetocapacitance (MC) above 350 K, from 1029% to 295% Near room temperature, there is no distinguished magnetoelectric coupling; the MC is 343% @ 250 K, 295% @ 300 K and 328% @ 350 K respectively The mechanism can be explained in light of the Maxwell–Wagner (MW) model and the enhanced MR origin from the successive mixed manganite phases and spin dependent tunneling across the junctions of PST/LSMO/LCMO This work provides a new approach for designing and developing novel composites with promising MC

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Large magnetodielectric response of PST/LSMO/LCMO film over a wide temperature range

Rectifying property and magnetoresistance of manganite–stannate junctions

Manganite-based heterojunctions La1−xCaxMnO3/SrTiO3: Nb (0.5 wt. %) with x = 0.2, 0.3, 0.375, 0.4, 0.5, 0.6, and 0.7 have been fabricated, and the lattice constants of La1−xCaxMnO3 films are experimentally studied. The capacitance characteristics of those junctions under a magnetic field have been investigated. Obvious magnetocapacitance was observed in La0.7Ca0.3MnO3/Nb-SrTiO3 p-n junction near the Curie temperature (TC) of La0.7Ca0.3MnO3 at 0.75 T. The result can be explained by phase separation. This study demonstrates the remarkable tunability of the capacitance for phase separated manganite heterojunctions, which may lead to some potential applications.

Q. Q. Gao

Papers

Magnetocapacitance of La1−xCaxMnO3/SrTiO3: Nb junctions with different Ca contents