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arXiv · 1703.08482

Electronic structure and direct observation of ferrimagnetism in multiferroic hexagonal YbFeO3

Shi Cao·Kishan Sinha·Xin Zhang·Xiaozhe Zhang·Xiao Wang·Yuewei Yin·Alpha T N'Diaye·Jian Wang·David J Keavney·Tula R Paudel·Yaohua Liu·Xuemei Cheng·Evgeny Y Tsymbal·Peter A Dowben·Xiaoshan Xu
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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 \muB at low-temperature, significantly reduced compared with the 4.5 \muB 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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Shi Cao, Kishan Sinha, Xin Zhang, Xiaozhe Zhang, Xiao Wang, Yuewei Yin, Alpha T N'Diaye, Jian Wang, David J Keavney, Tula R Paudel, Yaohua Liu, Xuemei Cheng, Evgeny Y Tsymbal, Peter A Dowben, Xiaoshan Xu. 2017-03-24. Electronic structure and direct observation of ferrimagnetism in multiferroic hexagonal YbFeO3. https://doi.org/10.1103/physrevb.95.224428

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