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• W4386977071 abstract "An $M$-type hexaferrite is a material with rich physical characteristics, such as magnetism, the dielectric property, and the magnetodielectric (MD) effect. In this paper, we systematically investigated the magnetic, dielectric, and MD properties of $mathrm{Ba}{mathrm{Fe}}_{12ensuremath{-}x}{mathrm{Me}}_{x}{mathrm{O}}_{19}$ ($mathit{Me}$ = Ga and In; $x=0.0$, 1.2, 1.8, and 2.4) ceramics prepared by a solid-state reaction method. The ${mathrm{Ga}}^{3+}$ cations with a smaller radius preferentially substitute the ${mathrm{Fe}}^{3+}$ ions in $mathrm{Fe}{mathrm{O}}_{6}$ octahedra, while the ${mathrm{In}}^{3+}$ cations with a larger radius tend to replace the ${mathrm{Fe}}^{3+}$ ions in $mathrm{Fe}{mathrm{O}}_{5}$ bipyramids of $R$ blocks, inducing different physical characteristics. The pure $mathrm{Ba}{mathrm{Fe}}_{12}{mathrm{O}}_{19}$ and Ga-doped samples show ferrimagnetism in the temperature range from 10 to 300 K. The In-doped samples exhibit a transition from noncollinear magnetism to collinear ferrimagnetism at 39, 128, and 144 K for the doping amounts of $x=1.2$, 1.8, and 2.4, respectively. The dielectric decrease of pure $mathrm{Ba}{mathrm{Fe}}_{12}{mathrm{O}}_{19}$ at $ensuremath{sim}10--175phantom{rule{0.16em}{0ex}}mathrm{K}$ is attributed to the quantum paraelectric state, and the shoulder peaks of tan $ensuremath{delta}$ at ensuremath{sim}140--200 K are from electron hopping. The dipole glass state is responsible for the dielectric peak of Ga-doped samples at $ensuremath{sim}20--40phantom{rule{0.16em}{0ex}}mathrm{K}$. The dielectric increase and plateau of In-doped samples are mainly ascribed to the electron hopping at low temperatures. Their dielectric properties at high temperatures are all attributed to the interfacial polarization caused by the Maxwell-Wagner effect. The MD effect also has different origins for the various samples at low temperatures. For pure $mathrm{Ba}{mathrm{Fe}}_{12}{mathrm{O}}_{19}$, the negative MD effect at extremely low temperatures and the positive MD effect after warming are ascribed to spin-phonon coupling and field-dependent electron hopping, respectively. The positive MD effect in Ga-doped hexaferrites results from the field-dependent electric dipoles inside $mathrm{Fe}{mathrm{O}}_{5}$ bipyramids. For the In-doped samples, the negative MD effect and subsequent transformation to the positive MD effect originate from the field-dependent noncollinear spin ordering and electron hopping, respectively. The MD effect at high temperatures is attributed to the combination of magnetoresistance and Maxwell-Wagner effects. These research results are helpful for understanding the relationship among doped ions, spin order, dielectric property, and the MD effect in $M$-type hexaferrites." @default.
• W4386977071 created "2023-09-23" @default.
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• W4386977071 date "2023-09-22" @default.
• W4386977071 modified "2023-10-17" @default.
• W4386977071 title "Different mechanisms for dielectric, magnetic, and magnetodielectric properties in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>M</mml:mi></mml:mrow></mml:math> -type <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>Ba</mml:mi><mml:msub><mml:mi>Fe</mml:mi><mml:mn>12</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>19</mml:mn></mml:msub></mml:mrow></mml:math> hexaferrite by <mml:math xmlns:mml=http://www.w3.org/…" @default.
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• W4386977071 doi "https://doi.org/10.1103/physrevb.108.104418" @default.
• W4386977071 hasPublicationYear "2023" @default.
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