Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.69: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Thin Films of M-Type Magnetoelectric Hexaferrites — •Bastian Stibbe¹, Stephan Geprägs¹, Matthias Opel¹, and Rudolf Gross^1,2 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik Department, TU München, Germany

Room-temperature magnetoelectric materials, which exhibit a cross-coupling between electric and magnetic order parameters, have attracted widespread interest over the last years, since they provide new opportunities in designing low-power spintronic devices. Among this class of materials, magnetoelectric hexaferrites are promising candidates, since they show large magnetoelectric effects at room temperature and low magnetic fields [1]. In particular, large electric field-induced changes of the magnetization were reported in the polycrystalline M-type hexaferrite SrCo₂Ti₂Fe₈O₁₉ [2].

Here, we report on the deposition of epitaxial SrCo₂Ti₂Fe₈O₁₉ thin films on Al₂O₃ (0001) single crystalline substrates by laser-MBE. To optimize the structural and magnetic properties, a series of SrCo₂Ti₂Fe₈O₁₉ thin films was fabricated varying the substrate temperature, the oxygen partial pressure as well as the laser fluence of the ablation process. The thin films are analyzed using high-resolution x-ray diffractometry, atomic-force microscopy, and SQUID magnetometry. Furthermore, converse magnetoelectric effects in terms of electric-field induced changes of the magnetization are discussed.

[1] T. Kimura, Annu. Rev. Condens. Matter Phys. 3, 93 (2012).

[2] L. Wang et al., Sci. Rep. 2, 223 (2012).