Enhanced electromechanical response of Fe-doped ZnO films by modulating the chemical state and ionic size of the Fe dopant

Luo, Jingting; Yang, Yi; Zhu, Xie-Gang; Chen, G.; Zeng, Fei; Pan, Feng

doi:10.1103/physrevb.82.014116

Cited by 101 publications

(43 citation statements)

References 38 publications

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“…Similar results have been detected in other Zn 0.95 − x Fe 0.05 Na x O (x = 0, 0.01, 0.05) samples. Based on the XPS results, Fe chemical states in Zn 0.95 − x Fe 0.05 Na x O samples are believed to be Fe 2+ as substitution state, similar to the reports on the ZnFeO system by other studies [27,28], which reveals that the chemical state of Fe in Fe doped ZnO changes from Fe 3+ to Fe 2+ with an increase in the amount of Fe dopant and Fe chemical states in Zn 1 − x Fe x O (x ≥ 2.6 at.%) are found to be Fe 2+ . Fig.…”

Section: Resultssupporting

confidence: 81%

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Jiang

Yan

2012

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 81%

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Jiang

Yan

2012

Journal of Alloys and Compounds

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“…The effective on-site Coulomb and exchange parameters, U and J, were set to 4.5 and 0.89 eV, respectively [15]. This served to describe the Coulomb and exchange interactions for the Fe 3d electrons in the strongly correlated (111) surfaces, among which the (001)-based surface was reported to be the most stable [16][17][18]. The stability of the (001) surface is further confirmed by our calculations (see Table 1 and Fig.…”

Section: +mentioning

confidence: 99%

Achieving a high magnetization in sub-nanostructured magnetite films by spin-flipping of tetrahedral Fe3+ cations

et al. 2015

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Magnetite Fe 3 O 4 (ferrite) has attracted considerable interest for its exceptional physical properties: It is predicted to be a semimetallic ferromagnetic with a high Curie temperature, it displays a metal-insulator transition, and has potential oxide-electronics applications. Here, we fabricate a high-magnetization (> 1 Tesla) high-resistance (~0.1 Ω·cm) sub-nanostructured (grain size < 3 nm) Fe 3 O 4 film via grain-size control and nano-engineering. We report a new phenomenon of spinflipping of the valence-spin tetrahedral Fe 3+ in the sub-nanostructured Fe 3 O 4 film, which produces the high magnetization. Using soft X-ray magnetic circular dichroism and soft X-ray absorption, both at the Fe L 3,2 -and O K-edges, and supported by first-principles and charge-transfer multiple calculations, we observe an anomalous enhancement of double exchange, accompanied by a suppression of the superexchange interactions because of the spin-flipping mechanism via oxygen at the grain boundaries. Our result may open avenues for developing spinmanipulated giant magnetic Fe 3 O 4 -based compounds via nano-grain size control.

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“…We obtained doped-ZnO with giant piezoresponse, Zn 0.975 V 0.025 O of 170pC/N [40], Zn 0. 94 [42,43]. The macroscopic and microscopic mechanisms were studied by systematical experiments and characterizations.…”

Section: Introductionmentioning

confidence: 99%

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Pan

Luo

Yang

et al. 2011

Sci. China Technol. Sci.

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In recent years, with the growing concerns on environmental protection and human health, new materials, such as lead-free piezoelectric materials, have received increasing attention. So far, three types of lead-free piezoelectric systems have been widely researched, i.e., perovskites, bismuth layer-structured ferroelectrics, and tungsten-bronze type ferroelectrics. This article presents a new type of environmental friendly piezoelectric material with simple structure, the transition-metal(TM)-doped ZnO. Through substituting Zn 2+ site with small size ion, we obtained a series of TM-doped ZnO with giant piezoresponse, such as Zn 0.975 V 0.025 O of 170 pC/N, Zn 0.94 Cr 0.06 O of 120 pC/N, Zn 0.913 Mn 0.087 O of 86 pC/N and Zn 0.988 Fe 0.012 O of 127 pC/N. The tremendous piezoresponses are ascribed to the introduction of switchable spontaneous polarization and high permittivity in TM-doped ZnO.The microscopic origin of giant piezoresponse is also discussed. Substitution of TM ion with small ionic size for Zn 2+ results in the easier rotation of noncollinear TM-O1 bonds along the c axis under the applied field, which produces large piezoelectric displacement and corresponding piezoresponse enhancement. Furthermore, it proposes a general rule to guide the design of new wurtzite semiconductors with enhanced piezoresponses. That is, TM-dopant with ionic size smaller than Zn 2+ substitutes for Zn 2+ site will increase the piezoresponse of ZnO significantly. Finally, we discuss the improved performances of some TM-doped ZnO based piezoelectric devices.

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Enhanced electromechanical response of Fe-doped ZnO films by modulating the chemical state and ionic size of the Fe dopant

Cited by 101 publications

References 38 publications

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Achieving a high magnetization in sub-nanostructured magnetite films by spin-flipping of tetrahedral Fe3+ cations

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

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