Magneto-thermal conductivity of perovskite manganite films and exchange-spring coupled superlattices
von Vitaly Bruchmann-Bamberg
Datum der mündl. Prüfung:2024-01-12
Erschienen:2024-02-21
Betreuer:Prof. Dr. Vasily Moshnyaga
Gutachter:Prof. Dr. Vasily Moshnyaga
Gutachter:Prof. Dr. Christian Jooß
Dateien
Name:Dissertation_Vitaly_Bruchmann-Bamberg.pdf
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Zusammenfassung
Englisch
In this thesis, thin colossal magnetoresistive perovskite manganite films and superlattices forming an exchange spring magnet were studied regarding their magneto-thermal conductivity. Using the metalorganic aerosol deposition technique high quality films and superlattices were grown on different substrates and were analyzed with the 3-omega method for thermal conductivity measurements which was implemented into a physical property measurement system setup. Single thin films of lanthanum praseodymium calcium manganite showed an expected behavior of positive magneto-thermal conductivity known from literature bulk measurements with only slight deviations related to thin film geometry, whereas superlattices of perovskite/double perovskite superlattices of lanthanum strontium/lanthanum cobalt manganite were found to have perpendicular magnetic anisotropy and both positive and negative magneto-thermal conductivity dependent on the magnetic spin order/disorder that can be controlled by external magnetic fields.
Keywords: Thin films, superlattices, colossal magnetoresistance, exchange spring magnet, perpendicular magnetic anisotropy, magneto-thermal conductivity