Статья

Magnetic structure and multiferroicity of Sc-substituted hexagonal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Yb</mml:mi><mml:mi>Fe</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Yuying TangLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaS. M. WangLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaL. LinLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaV. Ovidiu GarleaNeutron Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USATao ZouCollaborative Innovation Center of Light Manipulations and Applications, Shangdong Normal University, Jinan 250358, ChinaShuhan ZhengLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaH.-M. ZhangSchool of Physics, Southeast University, Nanjing 211189, ChinaJie ZhouNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, ChinaZhenlin LuoNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, ChinaZ. B. YanLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaShuai DongSchool of Physics, Southeast University, Nanjing 211189, ChinaTimothy CharltonNeutron Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAJun‐Ming LiuLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

2021lv

ABI

Аннотация

The hexagonal rare-earth ferrite $R\mathrm{Fe}{\mathrm{O}}_{3}$ family represents a unique class of multiferroics exhibiting weak ferromagnetism, and a strong coupling between magnetism and structural trimerization is predicted. However, the hexagonal structure for $R\mathrm{Fe}{\mathrm{O}}_{3}$ remains metastable in conventional conditions. We have succeeded in stabilizing the hexagonal structure of polycrystalline $\mathrm{Yb}\mathrm{Fe}{\mathrm{O}}_{3}$ by partial Sc substitution of Yb. Using bulk magnetometry and neutron diffraction, we find that ${\mathrm{Yb}}_{0.42}{\mathrm{Sc}}_{0.58}\mathrm{Fe}{\mathrm{O}}_{3}$ orders into a canted antiferromagnetic state with the N\'eel temperature ${T}_{N}\ensuremath{\sim}165\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, below which the ${\mathrm{Fe}}^{3+}$ moments form the triangular configuration in the $ab$ plane and their in-plane projections are parallel to the [100] axis, consistent with magnetic space group $P{6}_{3}{c}^{\ensuremath{'}}{m}^{\ensuremath{'}}$. It is determined that the spin canting is aligned along the $c$ axis, giving rise to the weak ferromagnetism. Furthermore, the ${\mathrm{Fe}}^{3+}$ moments reorient toward a new direction below reorientation temperature ${T}_{R}\ensuremath{\sim}40\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, satisfying magnetic subgroup $P{6}_{3}$, while the ${\mathrm{Yb}}^{3+}$ moments order independently and ferrimagnetically along the $c$ axis at the characteristic temperature ${T}_{\mathrm{Yb}}\ensuremath{\sim}15\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Interestingly, reproducible modulation of electric polarization induced by magnetic field at low temperature is achieved, suggesting that the delicate structural distortion associated with two-up/one-down buckling of the Yb/Sc planes and tilting of the $\mathrm{Fe}{\mathrm{O}}_{5}$ bipyramids may mediate the coupling between ferroelectric and magnetic orders under magnetic field. The present work represents substantial progress to search for high-temperature multiferroics in hexagonal ferrites and related materials.

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Идентификаторы

DOI: 10.1103/physrevb.103.174102

Цитирования и источники

Цитирований: 2Использованных источников: 0

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