Magnetic Origin of Giant Magnetoelectricity in Doped Y-type Hexaferrite Ba0.5Sr1.5Zn2(Fe1xAlx)12O22

Woo-Suk Noh, Kyung-Tae Ko, Sae Hwan Chun, Kee Hoon Kim, Byeong-Gyu Park, Jae-Young Kim, and Jae-Hoon Park
Phys. Rev. Lett. 114, 117603 – Published 19 March 2015
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Abstract

We investigated site-specific magnetic behaviors of multiferroic Ba0.5Sr1.5Zn2(Fe1xAlx)12O22 using Fe L2,3-edge x-ray magnetic circular dichroism. The Al dopants mostly replace the Fe3+ ions at octahedral (Oh) sites, which contribute unquenched angular momenta through off-centering displacements. This replacement greatly reduces the magnetic anisotropy energy to change the magnetic order from a helical to a heliconical type with enhanced magnetoelectric susceptibility (αME). The tetrahedral (Td) Fe sites exhibit magnetic hysteresis distinguishable from that of the Oh sites, especially at low magnetic fields. These results provide essential clues for the heliconical order with a giant αME and multibit memory effects in the Al-doped Y-type hexaferrite.

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  • Received 8 December 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.117603

© 2015 American Physical Society

Authors & Affiliations

Woo-Suk Noh1, Kyung-Tae Ko1,2,3, Sae Hwan Chun4, Kee Hoon Kim4, Byeong-Gyu Park5, Jae-Young Kim5, and Jae-Hoon Park1,2,6,*

  • 1c_CCMR and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
  • 2Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
  • 3Max Planck Institute for Chemical Physics in Solid, 01187 Dresden, Germany
  • 4FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
  • 5Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
  • 6Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

  • *To whom all correspondence should be addressed. jhp@postech.ac.kr

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Issue

Vol. 114, Iss. 11 — 20 March 2015

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