Here we report a giant, completely reversible magneto-electric coupling of 100 nm polycrystalline Co layer in contact with ZnO nanorods. When the sample is under an applied bias of ± 2 V, the Co magnetic coercivity is reduced by a factor 5 from the un-poled case, with additionally a reduction of total magnetic moment in Co. Taking into account the chemical properties of ZnO nanorods measured by x-rays absorption near edge spectroscopy under bias, we conclude that these macroscopic effects on the magnetic response of the Co layer are due to the microstructure and the strong strain-driven magneto-electric coupling induced by the ZnO nanorods, whose nanostructuration maximizes the piezoelectric response under bias.
Giant magneto-electric coupling in 100 nm thick Co capped by ZnO nanorods / Vinai, Giovanni; Ressel, Barbara; Torelli, Piero; Loi, Federico; Gobaut, Benoit; Ciancio, Regina; Casarin, Barbara; Caretta, Antonio; Capasso, Luca; Parmigiani, Fulvio; Cugini, Francesco; Solzi, Massimo; Malvestuto, Marco; Ciprian, Roberta. - In: NANOSCALE. - ISSN 2040-3364. - 10(2018), pp. 1326-1336. [10.1039/C7NR09233D]
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