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- W12694306 abstract "Powder neutron diffraction and magnetometry studies have been conducted to investigate the crystallographic and magnetic structure of ${mathrm{Bi}}_{0.8}{mathrm{La}}_{0.2}{mathrm{Fe}}_{0.5}{mathrm{Mn}}_{0.5}{mathrm{O}}_{3}$. The compound stabilizes in the $Imma$ orthorhombic crystal symmetry in the measured temperature range of 5 to 380 K, with a transition to antiferromagnetic order at ${T}_{mathrm{N}}ensuremath{approx}240$ K. The spin cycloid present for BiFeO${}_{3}$ is found to be absent with 50% Mn${}^{3+}$ cation substitution, leading to $G$-type antiferromagnetic order with an enhanced out-of-plane canted ferromagnetic component, evident from measurable weak-ferromagnetic hysteresis. Structural modifications do not solely explain this behavior, indicating that modified electron exchange interactions must be taken into account. A classical spin simulation was developed to investigate the effect of random substitution in a disordered pseudocubic perovskite. The calculations took into account the nearest-neighbor, next-nearest-neighbor, and Dzyaloshinskii-Moriya interactions, along with the local spin anisotropy. Using this framework to extend the established Hamiltonian model for BiFeO${}_{3}$, we show that only certain types of perturbations at a magnetic defect and the surrounding molecular fields trigger a simultaneous collapse of cycloidal order and the emergence of the long-range weak-ferromagnetic component. By adopting values for the Mn molecular fields appropriate for $mathit{RE}$MnO${}_{3}$ ($mathit{RE}=$ rare earth), simulations of BiMn${}_{0.5}$Fe${}_{0.5}{mathrm{O}}_{3}$ exhibit the key magnetic properties of our experimental observations." @default.
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- W12694306 date "2014-04-23" @default.
- W12694306 modified "2023-10-16" @default.
- W12694306 title "Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskite<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>Bi</mml:mi><mml:mrow><mml:mn>0.8</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>0.2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi …" @default.
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- W12694306 doi "https://doi.org/10.1103/physrevb.89.144422" @default.
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