Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22

Nakajima, Taro; Tokunaga, Yusuke; Matsuda, Masaaki; Dissanayake, Sachith E.; Fernandez-Baca, Jaime A.; Kakurai, Kazuhisa; Taguchi, Yasujiro; Tokura, Yoshinori; Arima, Taka-hisa

doi:10.1103/PhysRevB.94.195154

Title: Magnetic structures and excitations in a multiferroic Y-type hexaferrite ${BaSrCo}_{2} {Fe}_{11} {AlO}_{22}$

Journal Article · Wed Nov 30 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.195154· OSTI ID:1337864

Nakajima, Taro ^[1]; Tokunaga, Yusuke ^[2]; Matsuda, Masaaki ^[3]; Dissanayake, Sachith E. ^[3]; Fernandez-Baca, Jaime A. ^[4]; Kakurai, Kazuhisa ^[5]; Taguchi, Yasujiro ^[1]; Tokura, Yoshinori ^[1]; Arima, Taka-hisa ^[2]

RIKEN Center for Emergent Matter Science, Saitama (Japan)
RIKEN Center for Emergent Matter Science, Saitama (Japan); Univ. of Tokyo, Kashiwa (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Univ. of Tennessee, Knoxville, TN (United States)
RIKEN Center for Emergent Matter Science, Saitama (Japan); Japan Atomic Energy Agency, Ibaraki (Japan); Comprehensive Research Organization for Science and Society, Ibaraki (Japan)

Here, we have investigated magnetic orders and excitations in a Y-type hexaferrite BaSrCo₂Fe₁₁AlO₂₂ (BSCoFAO), which was reported to exhibit spin-driven ferroelectricity at room temperature. By means of magnetization, electric polarization, and neutron-diffraction measurements using single-crystal samples, we establish a H-T magnetic phase diagram for magnetic field perpendicular to the c axis (H_⟂c). This system exhibits an alternating longitudinal conical (ALC) magnetic structure in the ground state, and it turns into a non-co-planar commensurate magnetic order with spin-driven ferroelectricity under H_⟂c. The field-induced ferroelectric phase remains as a metastable state after removing magnetic field below 250 K. This metastability is the key to understanding of magnetic field reversal of the spin-driven electric polarization in this system. Inelastic polarized neutron-scattering measurements in the ALC phase reveal a magnetic excitation at around 7.5 meV, which is attributed to spin components oscillating in a plane perpendicular to the cone axis. This phasonlike excitation is expected to be an electric-field active magnon, i.e., electromagnon excitation, in terms of the magnetostriction mechanism.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1337864

Alternate ID(s):: OSTI ID: 1333977

Journal Information:: Physical Review B, Vol. 94, Issue 19; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Title: Magnetic structures and excitations in a multiferroic Y-type hexaferrite ${BaSrCo}_{2} {Fe}_{11} {AlO}_{22}$