---

Currently 5d transition-metal oxides receive considerable attention due to their possibly significant spin-orbit coupling (SOC). In this talk, we will show, using ab initio calculations, that the SOC is indeed important in one-dimensional (1D) and 2D 5d transition-metal oxides. This is exemplified by addressing the varying magnetic moments in Fe or Co doped Sr2IrO4 [1] and the SOC tuning magnetism in Sr3NiIrO6 [2]. However, the SOC turns insignificant in 3D double perovskites Ca2FeOsO6 and Sr2NiIrO6 due to the band effect. In contrast to the high-temperature ferrimagnetism in Ca2FeOsO6 [3], an unusual magnetic frustration appears in Sr2NiIrO6 [4]. Finally, we will discuss how to ‘engineer’ a maximum magnetic anisotropy in Co, Ru, and Os adatoms on MgO (001) surface [5]. [1] X. D. Ou & H. Wu, PRB 89, 035138 (2014). [2] X. D. Ou & H. Wu, Sci. Rep. 4, 4609 (2014). [3] H. B. Wang et al., PRB 90, 054406 (2014). [4] X. D. Ou et al., Sci. Rep. 4, 7542 (2014). [5] X. D. Ou et al., submitted (2015).

---

Hua Wu, Fudan University
Seminar Room of the Institute of Physics II
Contact: Markus Braden