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Transparent ferrimagnetic semiconducting CuCr2
thin films by atomic layer deposition
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We report the magnetic and optical properties of CuCr2O4thin films fabricated by atomic layer deposition(ALD) from Cu(thd)2, Cr(acac)3, and ozone; we deposit 200 nm thick films and anneal them at 700 °C in oxygen atmosphere to crystallize the spinel phase. A ferrimagnetic transition at 140 K and a direct bandgap of 1.36 eV are determined for the films from magnetic and UV-vis spectrophotometric measurements. Electrical transport measurements confirm the p-type semiconducting behavior of the films. As the ALD technique allows the deposition of conformal pin-hole-free coatings on complex 3D surfaces, our CuCr2O4films are interesting material candidates for various frontier applications.
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