Evidence for the coexistence of spin-glass and ferrimagnetic phases in BaFe<sub>12</sub>O<sub>19</sub> due to basal plane freezing

Kumar, Keshav; Mishra, Shrawan; Baev, Ivan; Martins, M.; Pandey, Dhananjai

doi:10.1039/d0cc03582c

Cited by 5 publications

(2 citation statements)

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“…The Debye model with β D = 1 describes free diffusion, whereas the Williams-Watts model with 0 < β WW < 1 describes a continuous-time random walk composed of alternating steps and pauses 19 . Examples of the Williams-Watts model include the spin-correlation in Cu-Mn and [20][21][22][23][24][25] ). The good fitting in Fig.…”

Section: Observation Of Light-induced Dark Conductivity Increasementioning

confidence: 99%

Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

et al. 2022

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Recent achievements in amorphous/crystalline silicon heterojunction (SHJ) solar cells and perovskite/SHJ tandem solar cells place hydrogenated amorphous silicon (a-Si:H) at the forefront of photovoltaics. Due to the extremely low effective doping efficiency of trivalent boron in amorphous tetravalent silicon, light harvesting of aforementioned devices is limited by their fill factors (FFs), a direct metric of the charge carrier transport. It is challenging but crucial to develop highly conductive doped a-Si:H with minimal FF losses. Here we report that light soaking can efficiently boost the dark conductance of boron-doped a-Si:H thin films. Light induces diffusion and hopping of weakly bound hydrogen atoms, which activates boron doping. The effect is reversible and the dark conductivity decreases over time when the solar cell is no longer illuminated. By implementing this effect to SHJ solar cells, we achieved a certified total-area power conversion efficiency of 25.18% with a FF of 85.42% on a 244.63 cm2 wafer.

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Section: Observation Of Light-induced Dark Conductivity Increasementioning

confidence: 99%

Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

et al. 2022

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“…The chemical composition and hexagonal symmetry of the single crystals were confirmed using energy-dispersive X-ray spectroscopy (EDX) and Laue diffraction measurements also and the details are given in previous study. [29] To capture departure from the Gorter model of the collinear magnetic structure of BFO, we used XMCD technique which probes the spin moment of the sample directly. [30][31][32] In BFO, partially filled d-orbitals of the Fe 3þ ions are responsible for spin moment.…”

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confidence: 99%

Evidence for Conical Magnetic Structure in M‐Type BaFe₁₂O₁₉ Hexaferrite: A Combined Single‐Crystal X‐ray Magnetic Circular Dichroism and Neutron Diffraction Study

Kumar

Mishra

Singh

et al. 2021

Physica Rapid Research Ltrs

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The magnetic ground state of BaFe 12 O 19 (BFO) is investigated using X-ray absorption spectra (XAS), X-ray magnetic circular dichroism (XMCD), and neutron diffraction studies at 1.2 and 1.5 K, respectively. The XMCD measurements on single-crystals of BFO in grazing-incidence geometry reveal canting of the spins away from the c-axis of the hexagonal unit cell. Single-crystal neutron diffraction studies reveal magnetic satellite peaks along the 00l reciprocal lattice row around the forbidden l ¼ 2n AE 1 positions confirming the conical-type magnetic structure in the ground state of BFO. The observation of the conical magnetic structure of BFO opens the possibility of type-II multiferroicity in undoped BFO.

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Tuning the microstructure, magnetostatic and magnetodynamic properties of highly Al-substituted M-type Sr/Ca hexaferrites prepared by citrate-nitrate auto-combustion method

Gorbachev

Лебедев

Kozlyakova

et al. 2023

Ceramics International

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Evidence for the coexistence of spin-glass and ferrimagnetic phases in BaFe₁₂O₁₉ due to basal plane freezing

Abstract: We present here results of low temperature magnetization and x-ray magnetic circular dichroism studies on single crystals of BaFe12O19 which reveal for the first time emergence of a spin glass...

Cited by 5 publications

References 41 publications

Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

Evidence for Conical Magnetic Structure in M‐Type BaFe₁₂O₁₉ Hexaferrite: A Combined Single‐Crystal X‐ray Magnetic Circular Dichroism and Neutron Diffraction Study

Tuning the microstructure, magnetostatic and magnetodynamic properties of highly Al-substituted M-type Sr/Ca hexaferrites prepared by citrate-nitrate auto-combustion method

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Evidence for the coexistence of spin-glass and ferrimagnetic phases in BaFe12O19 due to basal plane freezing

Abstract: We present here results of low temperature magnetization and x-ray magnetic circular dichroism studies on single crystals of BaFe12O19 which reveal for the first time emergence of a spin glass...

Cited by 5 publications

References 41 publications

Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

Evidence for Conical Magnetic Structure in M‐Type BaFe12O19 Hexaferrite: A Combined Single‐Crystal X‐ray Magnetic Circular Dichroism and Neutron Diffraction Study

Tuning the microstructure, magnetostatic and magnetodynamic properties of highly Al-substituted M-type Sr/Ca hexaferrites prepared by citrate-nitrate auto-combustion method

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Evidence for the coexistence of spin-glass and ferrimagnetic phases in BaFe₁₂O₁₉ due to basal plane freezing

Evidence for Conical Magnetic Structure in M‐Type BaFe₁₂O₁₉ Hexaferrite: A Combined Single‐Crystal X‐ray Magnetic Circular Dichroism and Neutron Diffraction Study