Effect of geometry on the magnetic properties of CoFe2O4–PbTiO3 multiferroic composites

Wang, Boyao; Wang, Hsiao‐Tsu; Singh, Shashi Bhushan; Shao, Yu; Wang, Y. F.; Chuang, Chia-Hsun; Yeh, Ping Hung; Chiou, J. W.; Pao, C. W.; Tsai, Hsiu-Min; Lin, Hong Ji; Lee, J. F.; Tsai, Chih Ya; Hsieh, Wen–Feng; Tsai, Ming-Shian; Pong, W. F.

doi:10.1039/c3ra00104k

Cited by 53 publications

(27 citation statements)

References 46 publications

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“…The simulation of XMCD spectrum measured from the sample with SRO matrix reveals a mixture of Co 2+ cations at the T d and O h sites2829. The existence of Fe 2+ O h sites and Co 2+ T d sites suggests a site-exchange occurred in these systems because strain effect or oxygen vacancies can easily break the symmetry and redistribute cations and charges28293031. Based on the results of site simulation, the ratio of Fe 3+ T d sites and O h sites can be obtained as ~0.78 for nearly strain-free CFO, ~0.84 for medially strained CFO, and ~0.56 for highly strained CFO.…”

Section: Resultsmentioning

confidence: 98%

“…By applying the site simulation based on the ligand field model (LFM), XMCD spectra at Fe L 2,3 edges for these three samples (Fig. 5(a)) exhibit two negative peaks at 707.8 and 709.01 eV, and one positive peak at 709.6 eV, which are corresponding to the Fe 2+ and Fe 3+ cations at the octahedral (O h ) sites, and Fe 3+ cations at the tetrahedral (T d ) sites28293031. In addition, the sample with SRO matrix exhibits a decreased peak intensity in Fe 3+ T d sites and an increased peak intensity in Fe 3+ O h sites compared to the other two samples, revealing that more Fe 3+ cations prefer to occupy the O h sites in this case.…”

Section: Resultsmentioning

confidence: 99%

“…Chen et al proposed that this dramatic enhancement of magnetic moments in the case of BFO matrix comes from a strong magnetic coupling between the mesocrystal and the matrix32. The simulation of XMCD spectrum measured from the sample with SRO matrix reveals a mixture of Co 2+ cations at the T d and O h sites2829. The existence of Fe 2+ O h sites and Co 2+ T d sites suggests a site-exchange occurred in these systems because strain effect or oxygen vacancies can easily break the symmetry and redistribute cations and charges28293031.…”

Section: Resultsmentioning

confidence: 99%

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Tuning the functionalities of a mesocrystal via structural coupling

Liu

Tsai

et al. 2015

Sci Rep

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In the past decades, mesocrystal, a kind of nanocrystals with specific crystallographic orientation, has drawn a lot of attention due to its intriguing functionalities. While the research community keeps searching for new mesocrystal systems, it is equally crucial to develop new approaches to tune the properties of mesocrystals. In this work, a self-organized two-dimensional mesocrystal composed of highly oriented CoFe2O4 (CFO) nano-crystals with assistance of different perovskite matrices is studied as a model system. We have demonstrated that the strain state and corresponding magnetic properties of the CFO mesocrystal can be modulated by changing the surrounding perovskite matrix through their intimate structural coupling. Interestingly, this controllability is more strongly correlated to the competition of bonding strength between the matrices and the CFO mesocrystals rather than the lattice mismatch. When embedded in a matrix with a higher melting point or stiffness, the CFO mesocrystal experiences higher out-of-plane compressive strain and shows a stronger magnetic anisotropy as well as cation site-exchange. Our study suggests a new pathway to tailor the functionalities of mesocrystals.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Tuning the functionalities of a mesocrystal via structural coupling

Liu

Tsai

et al. 2015

Sci Rep

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“…4(a,b) for the E -field parallel and perpendicular to the (110) plane, respectively. This method has been utilized elsewhere to examine the existence of complex bonds3435. Ψ( k ) and dΨ( k )/d k are commonly obtained to determine the existence of atomic species at tetrahedral and octahedral positions in distorted perovskites.…”

Section: Resultsmentioning

confidence: 99%

“…Ψ( k ) and dΨ( k )/d k are commonly obtained to determine the existence of atomic species at tetrahedral and octahedral positions in distorted perovskites. Additionally, this analysis provides accurate information about the associated slightly different bond distances3435. The difference between bond distances is obtained via EXAFS beating point analysis using the formula…”

Section: Resultsmentioning

confidence: 99%

Electronic and atomic structures of the Sr3Ir4Sn13 single crystal: A possible charge density wave material

Wang

Srivastava

et al. 2017

Sci Rep

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X-ray scattering (XRS), x-ray absorption near-edge structure (XANES) and extended x-ray absorption fine structure (EXAFS) spectroscopic techniques were used to study the electronic and atomic structures of the high-quality Sr3Ir4Sn13 (SIS) single crystal below and above the transition temperature (T* ≈ 147 K). The evolution of a series of modulated satellite peaks below the transition temperature in the XRS experiment indicated the formation of a possible charge density wave (CDW) in the (110) plane. The EXAFS phase derivative analysis supports the CDW-like formation by revealing different bond distances [Sn1(2)-Sn2] below and above T* in the (110) plane. XANES spectra at the Ir L3-edge and Sn K-edge demonstrated an increase (decrease) in the unoccupied (occupied) density of Ir 5d-derived states and a nearly constant density of Sn 5p-derived states at temperatures T < T* in the (110) plane. These observations clearly suggest that the Ir 5d-derived states are closely related to the anomalous resistivity transition. Accordingly, a close relationship exists between local electronic and atomic structures and the CDW-like phase in the SIS single crystal.

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Enhanced Magnetization in CoFe₂O₄ Through Hydrogen Doping

Lyu

Zhao

et al. 2023

Adv Funct Materials

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Magnetic spinel oxides have attracted extensive research interest due to their rich physics and wide range of applications. However, these materials invariably suffer suppressed magnetization, due to structural imperfections (e.g., disorder, anti-site defects, etc.). Herein, a dramatic enhanced magnetization is obtained with an increasement of 5 µ B /u.c in CoFe 2 O 4 (CFO) through ionic liquid gating induced hydrogen doping. The intercalated hydrogen ions lead to both distinct lattice expansion of ≈0.7% and notable Fe valence state reduction through electron doping, in which ≈17% Fe 3+ is reduced into Fe 2+ . These facts collectively trigger a site-specific spin-flip on tetrahedrally coordinated Co 2+ sites that enhances the net ferrimagnetic moment nearly to its theoretical maximum for perfect CFO.

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Effect of geometry on the magnetic properties of CoFe2O4–PbTiO3 multiferroic composites

Cited by 53 publications

References 46 publications

Tuning the functionalities of a mesocrystal via structural coupling

Tuning the functionalities of a mesocrystal via structural coupling

Electronic and atomic structures of the Sr3Ir4Sn13 single crystal: A possible charge density wave material

Enhanced Magnetization in CoFe₂O₄ Through Hydrogen Doping

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Effect of geometry on the magnetic properties of CoFe2O4–PbTiO3 multiferroic composites

Cited by 53 publications

References 46 publications

Tuning the functionalities of a mesocrystal via structural coupling

Tuning the functionalities of a mesocrystal via structural coupling

Electronic and atomic structures of the Sr3Ir4Sn13 single crystal: A possible charge density wave material

Enhanced Magnetization in CoFe2O4 Through Hydrogen Doping

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Product

Resources

About

Enhanced Magnetization in CoFe₂O₄ Through Hydrogen Doping