Fragile magnetic ordering between robust 2D-ferrimagnets in the AFe3(SeO3)2F6 (A = K, Rb, Cs) series

Yang, Haoming; Mentré, Olivier; Zhu, Tianyu; Minaud, Claire; Ritter, C.; Zhang, Xinan; Jin, Yong; Lü, Minfeng

doi:10.1039/d1tc05650f

Cited by 4 publications

(3 citation statements)

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“…30 For S = 5/2 Fe 3+ ions, a good estimation of T N was achieved using S = 1 values (n = 0.68 and b = 3.12). 31 For BiFeOF with mixed valent Fe 2.5+ , the same n and b values result in a T N ∼ 101 K, slightly overestimated compared to the experimental T N = 89 K. For BiNiOF, it returns an excellent estimation of T N = 44.2 K compared to its experimental value of ∼45 K.…”

Section: (Bi 2 O 2 )(Fef 4 ) Electronic Structurementioning

confidence: 78%

“…For weakly coupled 2D Heisenberg S = 1/2 and S = 1 antiferromagnets, the estimation of T N has been analytically studied via T N = 4π· n · J intra /[ b – ln(| J inter / J intra |)] using a modified random-phase approximation, where n and b were adjusted from various materials . For S = 5/2 Fe 3+ ions, a good estimation of T N was achieved using S = 1 values ( n = 0.68 and b = 3.12) . For BiFeOF with mixed valent Fe 2.5+ , the same n and b values result in a T N ∼ 101 K, slightly overestimated compared to the experimental T N = 89 K. For BiNiOF, it returns an excellent estimation of T N = 44.2 K compared to its experimental value of ∼45 K.…”

Section: Magnetism (M = Fe and Ni)mentioning

confidence: 97%

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All-Magnetic Slabs and Multiferroism in (Bi_2–xO₂)(MF₄) Aurivillius Oxyfluorides (M = Fe and Ni)

et al. 2022

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The Aurivillius-layered compounds with a predominant fraction of paramagnetic transition metals are an emerging playground for the discovery of magnetoelectric or multiferroic compounds. This aim was recently achieved by incorporating F– anions in the perovskite layer of the (Bi2O2)(CoF4) compound, only described so far in a disordered model (unit cell: a p, a p, c). Here, we report the investigation on the representative compounds (Bi2O2)(MF4) (M = Fe and Ni) using single crystal, synchrotron, neutron, and electron diffraction. These reveal that the crystallographic average cell (√2 × a p, √2 × a p, c) is orthorhombic, polar, and accompanied by versatile (in)commensurate modulations. The supercell model was fully refined for (Bi2–x O2)(FeF4) [q = (0, 1/2, 0)] in the P2111 polar space group with transverse Fe-displacements relative to q. Bi deficiency is compensated by a mixed Fe∼2.5+ valence, but the ideal stoichiometry is preserved for (Bi2O2)(NiF4). Both compounds are antiferromagnetic below T N = 89 K (Fe) and 45 K (Ni), with moments lying in the (ac) plane and a weak ferromagnetic component along the b-axis. Density functional theory calculations validate a strongly anisotropic distribution of magnetic exchanges (J ab /J c > 10). A broad anomaly on the dielectric constant at T N and a polarization loop at room temperature were obtained on (Bi2–x O2)(FeF4) single crystals, revealing multiferroism with magnetoelectric couplings.

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Section: (Bi 2 O 2 )(Fef 4 ) Electronic Structurementioning

confidence: 78%

Section: Magnetism (M = Fe and Ni)mentioning

confidence: 97%

All-Magnetic Slabs and Multiferroism in (Bi_2–xO₂)(MF₄) Aurivillius Oxyfluorides (M = Fe and Ni)

et al. 2022

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“…The magnetization M(H) loops have been collected on oriented crystals aligned and blocked in drying epoxy under a field of 9T. Around T C the re‐determination of the critical exponents analyzed along modified Arrott‐Noakes plots [ 24 ] satisfies the Ising‐2D model (β = 0.132(2)/0.125 theo , γ = 1.25(4)/1.75 theo , δ = 13.3(1)/15 theo ) with T C = 65 K (, See Section S3 and Figure S3, Supporting Information). The typical perpendicular (M // ) and parallel (M ⊥ ) M(H) curves to the easy‐magnetic axis confirm a giant magneto‐crystalline anisotropy quantified below (see Figure 1I at 20 K).…”

Section: Resultsmentioning

confidence: 99%

Multivalued Memory via Freezing of Super‐Hard Magnetic Domains in a Quasi 2D‐Magnet

et al. 2023

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The design of high‐density non‐volatile memories is a long‐standing dream, limited by conventional storage “0” or “1” bits. An alternative paradigm exists in which regions within candidate materials can be magnetized to intermediate values between the saturation limits. In principle, this paves the way to multivalued bits, vastly increasing storage density. Single‐molecule magnets, are good examples offering transitions between intramolecular quantum levels, but require ultra‐low temperatures and limited relaxation time between magnetization states. It is showed here that the quasi 2D‐Ising compound BaFe2(PO4)2 overcomes these limitations. The combination of giant magneto‐crystalline anisotropy, strong ferromagnetic exchange, and strong intrinsic pinning creates remarkably narrow magnetic domain walls, collectively freezing under Tf ≈15 K. This results in a transition from a soft to a super‐hard magnet (coercive force > 14 T). Any magnetization can then be printed and robustly protected from external fields with an energy barrier >9T at 2 K.

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Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

Yalikun,

Wang,

Shi

et al. 2024

Chem. Mater.

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We prepared a new polar layered quantum magnet Ba2Cu3(SeO3)4F2, by a combined use of F– and pyramidal SeO3 2– anions, determined its crystal structure by X-ray diffraction, and characterized its magnetic properties by magnetization, electron spin resonance (ESR) and specific heat measurements, and by density functional theory calculations. The title compound has first experimentally reported bitriangular chains of Cu2+ ions aligned along the b direction to form layers parallel to the ab plane, and these layers are separated by Ba2+ ions. The magnetic susceptibility data reveal that, despite strong predominant antiferromagnetic intrachain interactions indicated by the large negative Weiss temperature θ of −143.9 K within bitriangular chains, no long-range order occurs down to 2 K. The latter, further confirmed by the specific heat measurements, is attributed to the extremely weak interlayer interaction. The spins in each bitriangular chain become ferrimagnetically ordered to exhibit a 1/3-magnetization plateau, which persists at least up to 30 T. This reveals that each bitriangular chain acts as an S = 1/2 entity at low temperatures, as observed from the decrease of the effective magnetic moment P eff from 3.67 μB in the high temperature range to 1.89 μB in the low temperature range, equivalently, from three free Cu2+ ions to only one effective Cu2+ ion per formula unit. In each layer of Ba2Cu3(SeO3)4F2, the interaction between adjacent ferrimagnetic chains is ferromagnetic rather than antiferromagnetic, contrary to the observations in other reported cases.

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Fragile magnetic ordering between robust 2D-ferrimagnets in the AFe₃(SeO₃)₂F₆ (A = K, Rb, Cs) series

Abstract: Mixed anion compounds AFe3(SeO3)2F6 (A=K, Rb) have been synthesized by hydrothermal reactions. Prior results obtained for the isostructural Cs analog have revealed original 2D-ferrimagnetic (FI) blocks, antiferromagnetically (AFM) ordered around...

Cited by 4 publications

References 32 publications

All-Magnetic Slabs and Multiferroism in (Bi_2–xO₂)(MF₄) Aurivillius Oxyfluorides (M = Fe and Ni)

All-Magnetic Slabs and Multiferroism in (Bi_2–xO₂)(MF₄) Aurivillius Oxyfluorides (M = Fe and Ni)

Multivalued Memory via Freezing of Super‐Hard Magnetic Domains in a Quasi 2D‐Magnet

Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

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Fragile magnetic ordering between robust 2D-ferrimagnets in the AFe3(SeO3)2F6 (A = K, Rb, Cs) series

Abstract: Mixed anion compounds AFe3(SeO3)2F6 (A=K, Rb) have been synthesized by hydrothermal reactions. Prior results obtained for the isostructural Cs analog have revealed original 2D-ferrimagnetic (FI) blocks, antiferromagnetically (AFM) ordered around...

Cited by 4 publications

References 32 publications

All-Magnetic Slabs and Multiferroism in (Bi2–xO2)(MF4) Aurivillius Oxyfluorides (M = Fe and Ni)

All-Magnetic Slabs and Multiferroism in (Bi2–xO2)(MF4) Aurivillius Oxyfluorides (M = Fe and Ni)

Multivalued Memory via Freezing of Super‐Hard Magnetic Domains in a Quasi 2D‐Magnet

Polar Layered Magnet Ba2Cu3(SeO3)4F2 Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

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Fragile magnetic ordering between robust 2D-ferrimagnets in the AFe₃(SeO₃)₂F₆ (A = K, Rb, Cs) series

All-Magnetic Slabs and Multiferroism in (Bi_2–xO₂)(MF₄) Aurivillius Oxyfluorides (M = Fe and Ni)

All-Magnetic Slabs and Multiferroism in (Bi_2–xO₂)(MF₄) Aurivillius Oxyfluorides (M = Fe and Ni)

Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau