title: Magnetic origin of giant magnetoelectricity in doped Y-type hexaferrite Ba(0.5)Sr(1.5)Zn(2)(Fe(1-x)Al(x))(12)O(22).
abstract: We investigated site-specific magnetic behaviors of multiferroic Ba(0.5)Sr(1.5)Zn(2)(Fe(1-x)Al(x))(12)O(22) using Fe L(2,3)-edge x-ray magnetic circular dichroism. The Al dopants mostly replace the Fe(3+) ions at octahedral (O(h)) 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 (α(ME)). The tetrahedral (T(d)) Fe sites exhibit magnetic hysteresis distinguishable from that of the O(h) sites, especially at low magnetic fields. These results provide essential clues for the heliconical order with a giant α(ME) and multibit memory effects in the Al-doped Y-type hexaferrite.
authors.affiliation: c_CCMR and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
authors.forename: Woo-Suk
authors.initials: WS
authors.lastname: Noh
authors.affiliation: c_CCMR and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.|Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.|Max Planck Institute for Chemical Physics in Solid, 01187 Dresden, Germany.
authors.forename: Kyung-Tae
authors.initials: KT
authors.lastname: Ko
authors.affiliation: FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Sae Hwan
authors.initials: SH
authors.lastname: Chun
authors.affiliation: FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Kee Hoon
authors.initials: KH
authors.lastname: Kim
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
authors.forename: Byeong-Gyu
authors.initials: BG
authors.lastname: Park
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
authors.forename: Jae-Young
authors.initials: JY
authors.lastname: Kim
authors.affiliation: c_CCMR and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.|Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.|Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Park