Half-Metallicity and Magnetic Anisotropy in Double-Perovskite GdBaCo2O6 Films Prepared via Topotactic Oxidation

Tsukasa Katayama, Shishin Mo, Akira Chikamatsu, Yuji Kurauchi, Hiroshi Kumigashira, Tetsuya Hasegawa

Research output: Contribution to journalArticlepeer-review


Double-perovskite GdBaCo2Ox is a promising material owing to its fascinating electronic and magnetic features, such as spin crossover, charge and spin-state ordering, magnetic-field or photo-induced antiferromagnetic-to-ferromagnetic phase transition, and large magnetoresistance (MR). These properties can be controlled by changing the oxygen content (x), and an increase of x is effective for stabilizing ferromagnetic order. However, a stoichiometric phase (x = 6) has not yet been obtained because the distorted coordination geometry prefers oxygen vacancies. In this study, we report the successful synthesis of GdBaCo2O6 epitaxial films via the topotactic oxidation of a film with x = 5.5. The transformation between x = 5.5 and 6 phases was reversible via low-temperature redox reactions. The x = 6 film exhibited ferromagnetic and metallic behavior below the Curie temperature (TC) of 110 K and semiconducting behavior above TC. The spontaneous magnetization of the x = 6 film was 4.8 μB/f.u., which is the largest in the double-perovskite cobaltite system owing to the ferromagnetic interaction between Co3.5+ and Gd3+. It also exhibited strong magnetic anisotropy along the a axis (1.7 × 107 erg/cm3) and anisotropic MR behavior associated with the Gd/Ba ordering along the c axis.

Original languageEnglish
Pages (from-to)1295-1300
Number of pages6
JournalChemistry of Materials
Issue number3
Publication statusPublished - 2023 Feb 14

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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