Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba${}_{0.5}$Sr${}_{1.5}$Zn${}_{2}$(Fe${}_{1\ensuremath{-}x}$Al${}_{x}$)${}_{12}$O${}_{22}$

Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba $_{0.5}$ Sr $_{1.5}$ Zn $_{2}$ (Fe $_{1 - x}$ Al $_{x}$ ) $_{12}$ O $_{22}$

Hak Bong Lee, Young-Sang Song, Jae-Ho Chung, Sae Hwan Chun, Yi Sheng Chai, Kee Hoon Kim, M. Reehuis, K. Prokeš, and S. Mat’aš

Phys. Rev. B 83, 144425 – Published 26 April 2011

Abstract

Using neutron diffraction, we investigated the spin structures of magnetoelectric hexaferrite, Ba $_{0.5}$ Sr $_{1.5}$ Zn $_{2}$ (Fe $_{1 - x}$ Al $_{x}$ ) $_{12}$ O $_{22}$ ( $x = 0.08$ ) under a magnetic field ( $H ⊥ c$ ). When the crystal was cooled in a zero field, longitudinal spin cones were observed at low temperatures. These incommensurate phases, however, were replaced by the commensurate phase [ $k_{1} = (0, 0, \frac{3}{2}$ )] when the ferroelectricity was induced by an external field perpendicular to the $c$ axis. Magnetic structure refinement confirms that this commensurate order is compatible with the spin-current polarization. We argue that planar magnetic anisotropy plays an important role in determining the magnetic structure that is responsible for its magnetoelectricity.

Received 18 January 2011

DOI:https://doi.org/10.1103/PhysRevB.83.144425

Authors & Affiliations

Hak Bong Lee¹, Young-Sang Song¹, Jae-Ho Chung^1,*, Sae Hwan Chun², Yi Sheng Chai², Kee Hoon Kim², M. Reehuis³, K. Prokeš³, and S. Mat’aš³

¹Department of Physics, Korea University, Seoul 136-713, South Korea
²Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul 151-747, South Korea
³Helmholtz-Zentrum für Materialien und Energie, D-14109 Berlin, Germany

^*Correspondence author. jaehc@korea.ac.kr

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Vol. 83, Iss. 14 — 1 April 2011

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Physical Review B

covering condensed matter and materials physics

Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba $_{0.5}$ Sr $_{1.5}$ Zn $_{2}$ (Fe $_{1 - x}$ Al $_{x}$ ) $_{12}$ O $_{22}$

Hak Bong Lee, Young-Sang Song, Jae-Ho Chung, Sae Hwan Chun, Yi Sheng Chai, Kee Hoon Kim, M. Reehuis, K. Prokeš, and S. Mat’aš

Phys. Rev. B 83, 144425 – Published 26 April 2011

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Physical Review B

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Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba0.5Sr1.5Zn2(Fe1−xAlx)12O22

Hak Bong Lee, Young-Sang Song, Jae-Ho Chung, Sae Hwan Chun, Yi Sheng Chai, Kee Hoon Kim, M. Reehuis, K. Prokeš, and S. Mat’aš

Phys. Rev. B 83, 144425 – Published 26 April 2011

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Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba $_{0.5}$ Sr $_{1.5}$ Zn $_{2}$ (Fe $_{1 - x}$ Al $_{x}$ ) $_{12}$ O $_{22}$