Electronic and Magnetic Properties of Chemical Solution Deposited BiFeO3 Thin Film: a Soft X-ray Magnetic Circular Dichroism Study

Kumari, Poonam; Zzaman, M.; Jena, Satyaranjan; Kumar, Manish; Bharadwaj, R. R.; Verma, V. K.; Raza, Shahid; Amemiya, Kenta; Singh, V. R.

doi:10.1007/s10948-021-05840-y

Cited by 13 publications

(2 citation statements)

References 23 publications

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“…The saturation effect was approximately ~ 2% at the normal incidence in our case. The magnetic-dipole becomes inconsiderable for the cubic symmetry in magnetite, even though it breaks the additional surface symmetry [ 60 ]. The determined value of m spin , m orb , and m orb / m spin vs field for S.0–S.5 samples is plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Origin of Magnetization in Silica-coated Fe3O4 Nanoparticles Revealed by Soft X-ray Magnetic Circular Dichroism

et al. 2022

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Magnetite (Fe 3 O 4 ) nanoparticles (NPs) and SiO 2 -coated Fe 3 O 4 nanoparticles have successfully been synthesized using co-precipitation and modified Stöber methods, respectively. The samples were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), vibrating sample magnetometer (VSM) techniques, X-ray absorption spectroscopy (XAS), and X-ray magnetic circular dichroism (XMCD). XRD and FTIR data confirmed the structural configuration of a single-phase Fe 3 O 4 and the successful formation of SiO 2 -coated Fe 3 O 4 NPs. XRD also confirmed that we have succeeded to synthesize nano-meter size of Fe 3 O 4 NPs. HRTEM images showed the increasing thickness of SiO 2 -coated Fe 3 O 4 with the addition of the Tetraethyl Orthosilicate (TEOS). Room temperature VSM analysis showed the magnetic behaviour of Fe 3 O 4 and its variations that occurred after SiO 2 coating. The magnetic behaviour is further authenticated by XAS spectra analysis which cleared about the existence of SiO 2 shells that have transformed the crystal as well as the local structures of the magnetite NPs. We have performed XMCD measurements, which is a powerful element-specific technique to find out the origin of magnetization in SiO 2 -coated Fe 3 O 4 NPs, that verified a decrease in magnetization with increasing thickness of the SiO 2 coating. Graphical Abstract Magnetite (Fe 3 O 4 ) nanoparticles (NPs) and SiO 2 -coated Fe 3 O 4 nanoparticles have successfully been synthesized using co-precipitation and modified Stöber methods, respectively. The samples were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), vibrating sample magnetometer (VSM) techniques, X-ray absorption spectroscopy (XAS), and X-ray magnetic circular dichroism (XMCD). XRD and FTIR data confirmed the structural configuration of a single-phase Fe 3 O 4 and the successful formation of SiO 2 -coated Fe 3 O 4 NPs. XRD also confirmed that we have succeeded to sy...

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Section: Resultsmentioning

confidence: 99%

Origin of Magnetization in Silica-coated Fe3O4 Nanoparticles Revealed by Soft X-ray Magnetic Circular Dichroism

et al. 2022

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“…XAS and XMCD are very powerful techniques because of their element specific. Moreover, by applying the sum‐rule method, we can calculate the orbital ( m orb ) and spin ( m spin ) magnetic moments 13,18–21 . The formulae of sum rule are expressed in terms of integrals of L 3 and L 2 edges of XAS and XMCD as below:

m_{orb} = - \frac{4}{3} \frac{q}{r} n_{h} μ_{B}

m_{spin} = - 2 \frac{([], 3 p - 2 q)}{r} n_{h} μ_{B} - 7 m_{T}

where p is the integral of L 3 edge of XMCD, q is the integral of both L 2 and L 3 edges of the XMCD, and r is the integral of the sum of XAS of two light helicities.…”

Section: Resultsmentioning

confidence: 99%

Magnetic anisotropic of thermally evaporated FeNi thin film: A soft X‐ray magnetic circular dichroism study

Kumar

Verma²,

Singh

2021

Surface & Interface Analysis

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FeNi film was fabricated on Cu/MgO (001) substrates using thermal evaporation technique of a FeNi target to realize the formation of an L10‐FeNi phase. The magnetic anisotropy of FeNi film was systematically investigated by means of X‐ray absorption spectroscopy (XAS) and X‐ray magnetic circular dichroism (XMCD) techniques. Our L‐edge XAS and XMCD analysis is performed for 30‐nm FeNi film grown on Cu/MgO (001) substrate. The present experimental results of XAS and XMCD indicate that ~5% Fe atoms are oxidized. Our findings also showed that the orbital magnetic moment of Fe has a significant incident X‐ray angle dependence that exhibits a maximum value at the out‐of‐plane direction corresponding perpendicular to the plane. The origin of anisotropy is successfully explained by element‐specific XMCD technique. The enhancement in magnetic anisotropy energy (MAE) is due to orbital magnetic moments of Fe through spin–orbit interaction. The uniaxial anisotropy energy showed quantitatively good agreement with the volume MAE.

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Oxygen Vacancy: How Will Poling History Affect Its Role in Photoelectrocatalysis

Li,

Wang,

Bao

et al. 2024

ChemSusChem

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Oxygen vacancy (VO) has been recognized to possess an effect to promote the charge separation and transfer (CST) in various n‐type semiconductor based photoelectrodes. But how external stimulus will change this VO effect has not been investigated. In this work, external polarization is applied to investigate the effect of VO on the CST process of a typical ferroelectric BiFeO3 photoelectrode. It is found that negative poling treatment can significantly boost VO effect, while positive poling treatment will deteriorate the CST capability in BiFeO3 photoelectrodes. This poling history determined VO effect is rooted in the VO induced defect dipoles, wherein their alignment produces a depolarization electric field to modulate the CST driving force. This finding highlights the significance of poling history in functionalizing the VO in a photoelectrode.

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Electronic and Magnetic Properties of Chemical Solution Deposited BiFeO3 Thin Film: a Soft X-ray Magnetic Circular Dichroism Study

Cited by 13 publications

References 23 publications

Origin of Magnetization in Silica-coated Fe3O4 Nanoparticles Revealed by Soft X-ray Magnetic Circular Dichroism

Origin of Magnetization in Silica-coated Fe3O4 Nanoparticles Revealed by Soft X-ray Magnetic Circular Dichroism

Magnetic anisotropic of thermally evaporated FeNi thin film: A soft X‐ray magnetic circular dichroism study

Oxygen Vacancy: How Will Poling History Affect Its Role in Photoelectrocatalysis

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