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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 3: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)

KFM 3.9: Talk

Monday, March 17, 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 Ba_2−xSr_xCo₂Fe_11.1Al_0.9O₂₂ 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