Electronic Structure and Direct Observation of Ferrimagnetism in Multiferroic Hexagonal YbFeO3

  • Authors:
    Xiaoshan Xu (U Nebraska/Lincoln), Xiao Wang (Bryn Mawr College), Alpha N'Diaye (LBNL), Jian Wang (Canadian Light Source), David Keavney (Argonne National Lab), Tula R. Paudel (U Nebraska/Lincoln), Xuemei Cheng (Bryn Mawr College), Yaohua Liu (ORNL), Evgeny Tsymbal (U Nebraska/Lincoln), Shi Cao (U Nebraska/Lincoln), Peter Dowben (U Nebraska/Lincoln), Kishan Sinha (U Nebraska/Lincoln), Xin Zhang (U Nebraska/Lincoln), Yuewei Yin (U Nebraska/Lincoln), Xiaozhe Zhang (U Nebraska/Lincoln)
    Publication ID:
    P090644
    Publication Type:
    Paper
    Received Date:
    3-Apr-2017
    Last Edit Date:
    27-Jun-2017
    Research:
    2398.001 (University of Nebraska/Lincoln)

Abstract

The magnetic interaction between rare-earth and Fe ions in hexagonal rare-earth ferrites (h-REFeO3), may amplify the weak ferromagnetic moment on Fe, making these materials more appealing as multiferroics. To elucidate the interaction strength between the rare-earth and Fe ions as well as the magnetic moment of the rare-earth ions, element specific magnetic characterization is needed. Using X-ray magnetic circular dichroism, we have studied the ferrimagnetism in h-YbFeO3 by measuring the magnetization of Fe and Yb separately. The results directly show anti-alignment of magnetization of Yb and Fe ions in h-YbFeO3 at low temperature, with an exchange field on Yb of about 17 kOe. The magnetic moment of Yb is about 1.6 µB at low-temperature, significantly reduced compared with the 4.5 µB moment of a free Yb3+. In addition, the saturation magnetization of Fe in h-YbFeO3 has a sizable enhancement compared with that in h-LuFeO3. These findings directly demonstrate that ferrimagnetic order exists in h-YbFeO3; they also account for the enhancement of magnetization and the reduction of coercivity in h-YbFeO3 compared with those in h-LuFeO3 at low temperature, suggesting an important role for the rare-earth ions in tuning the multiferroic properties of h-REFeO3.

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