Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.69: Poster
Friday, April 4, 2014, 10:30–13:30, P2
Thin Films of M-Type Magnetoelectric Hexaferrites — •Bastian Stibbe1, Stephan Geprägs1, Matthias Opel1, and Rudolf Gross1,2 — 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).