Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
MA 2.9: Vortrag
Montag, 17. März 2025, 11:45–12:00, H16
Anomalously strong magnetoelectric coupling in hexaferrite films — •Jakub Vít1, Kwang-Tak Kim2, Hyunju Hwang2, Radomír Kužel3, Milan Dopita3, Darina Smržová4, Kee Hoon Kim2, and Josef Buršík4 — 1Institute of Physics, Czech Academy of Sciences, Czechia — 2Center for Novel States of Complex Materials Research, Seoul National University, Korea — 3Faculty of Mathematics and Physics, Charles University, Czechia — 4Institute of Inorganic Chemistry, Czech Academy of Sciences, Czechia
Bulk hexaferrites are well known to exhibit strong magnetoelectric (ME) effects, often extending up to room temperature. In contrast, ME properties of hexaferrite films have been investigated only in a single recent study: In Z-hexaferrite films, the ME effect was found significantly stronger than in a crystal. [1] We continued this research by studying Y-hexaferrite films Ba2−xSrxCo2Fe11.1Al0.9O22 on SrTiO3 (111), grown by chemical solution deposition. For x=1, the magnetic-field-induced polarization reached 6.5 mC/m2 at 10 K , i.e. 10x more than in the Z-hexaferrite films [1] and 50x more than in Y-hexaferrite crystals. [2] To elucidate these intriguing observations, microstructure of the films was studied in detail by real (SEM, TEM) and reciprocal (XRD) space techniques. Possible influence of the substrate on ME measurements was also taken into account.
[1] K. Shin et al., Adv. Electron. Mater. 2101294, (2022) [2] C. B. Park, et al., Phys. Rev. Mater. 5, 034412 (2021)
Keywords: magnetoelectric effect; hexaferrites; thin films; chemical solution deposition