Phase decomposition and related structural and magnetic properties of iron-cobaltite thin films

Kim, Kwang Joo; Lee, Jung Han; Kim, Chul Sung

doi:10.3938/jkps.61.1274

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…For the samples with ferromagnetic signals, namely, x = 0.1, 0.3, 0.5, and 0.7, the magnetic contributions to the corresponding specimens of the inclusions are conservatively estimated to be about or smaller than 3.9%, 1.9%, 3.8%, and 1.5%, respectively. While for x = 0.9 and 1.0, the inclusions are paramagnetic at 300 K 44 45 , and have no magnetic contributions to the main phase. Based on the criteria of the comprehensive framework raised by M. Schmidt et al .…”

Section: Resultsmentioning

confidence: 98%

“…Generally, the Fe and Co-rich magnetic inclusions have a chemical formula Fe 3- y Co y O 4 (0 ≤ y ≤ 3), and the remanent magnetizations (0–20 emu/g) at room temperature decrease with increasing Co content394041424344. Following the effective statistical method proposed by M. Schmidt et al 38,.…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that the doping of an Aurivillius phase with cobalt will lead to the generation of magnetic second-phase inclusions (Co/Fe-rich spinel phases) which volume fraction is too small to be visible in XRD but may be already enough to contribute significant ferromagnetic signal 9 37 38 . Generally, the Fe and Co-rich magnetic inclusions have a chemical formula Fe 3- y Co y O 4 (0 ≤ y ≤ 3), and the remanent magnetizations (0–20 emu/g) at room temperature decrease with increasing Co content 39 40 41 42 43 44 . Following the effective statistical method proposed by M. Schmidt et al .…”

Section: Resultsmentioning

confidence: 99%

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Structure Evolution and Multiferroic Properties in Cobalt Doped Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ Intergrowth Aurivillius Compounds

Zhang

Huang

Chen

et al. 2017

Sci Rep

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Here, we report the structure evolution, magnetic and ferroelectric properties in Co-doped 4- and 3-layered intergrowth Aurivillius compounds Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ. The compounds suffer a structure evolution from the parent 4-layered phase (Bi4NdTi3FeO15) to 3-layered phase (Bi3NdTi2CoO12-δ) with increasing cobalt doping level from 0 to 1. Meanwhile the remanent magnetization and polarization show opposite variation tendencies against the doping level, and the sample with x = 0.3 has the largest remanent magnetization and the smallest polarization. It is believed that the Co concentration dependent magnetic properties are related to the population of the Fe3+ -O-Co3+ bonds, while the suppressed ferroelectric polarization is due to the enhanced leakage current caused by the increasing Co concentration. Furthermore, the samples (x = 0.1–0.7) with ferromagnetism show magnetoelectric coupling effects at room temperature. The results indicate that it is an effective method to create new multiferroic materials through modifying natural superlattices.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Structure Evolution and Multiferroic Properties in Cobalt Doped Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ Intergrowth Aurivillius Compounds

Zhang

Huang

Chen

et al. 2017

Sci Rep

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“…From this pure spinel pristine phase obtained in the miscibility gap of the phase diagram, it is then possible to obtain self-organized materials by spinodal decomposition at low temperature [20]. Such a spontaneous transformation has a great interest because it can promote a regular alternation, at nanometric scale, of magnetically ordered phases made of iron-rich and cobalt-rich spinel oxides [21][22][23][24]. The study of spinodal decomposition of magnetically ordered phases could lead to original properties.…”

Section: Introductionmentioning

confidence: 98%

Preparation of iron cobaltite thin films by RF magnetron sputtering

et al. 2015

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International audienceIron cobaltite thin films with spinel structure have been elaborated by radio-frequency (RF) magnetronsputtering from a Co1.75Fe1.25O4 target. Influence of argon pressure on structure, microstructure and physicalproperties of films has been examined. Iron–cobalt oxide thin films essentially consist of one spinel phasewhen deposited at low pressure (0.5 and 1.0 Pa). At high pressure (2.0 Pa), the global stoichiometry of the filmis changed which results in the precipitation of a mixed monoxide of cobalt and iron beside the spinel phase.This in-situ reduction due to an oxygen loss occurring mainly at high deposition pressure has been revealed byX-ray diffraction and Raman spectroscopy. Microstructural evolution of thin film with argon pressure has beenshown by microscopic observations (AFM and SEM). The evolution of magnetic and electrical properties, versusargon pressure, has been also studied by SQUID and 4 point probe measurements

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“…3(a). The 2p-electron spectral shapes for the present multivalence iron oxides are well distinguishable from those for oxides containing Fe 3+ ions only [6,7]. For the x = 0.96 sample, the Fe 3+ peak is seen to be dominant, compared to that of Fe 3 O 4 , suggesting significant reduction in Fe 2+ density, caused by the Ni doping.…”

Section: Resultsmentioning

confidence: 59%

Structural Phase Transition, Electronic Structure, and Magnetic Properties of Sol-gel-prepared Inverse-spinel Nickel-ferrites Thin Films

Kim¹,

Kim²,

Kim³

2014

Journal of Magnetics

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X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM) were used to investigate the influence of Ni ions on the structural, electronic, and magnetic properties of nickelferrites (Ni x Fe 3-x O 4 ). Spinel Ni x Fe 3-x O 4 (x ≤ 0.96) samples were prepared as polycrystalline thin films on Al 2 O 3 (0001) substrates, using a sol-gel method. XRD patterns of the nickel-ferrites indicate that as the Ni composition increases (x > 0.3), a structural phase transition takes place from cubic to tetragonal lattice. The XPS results imply that the Ni ions in Ni x Fe 3-x O 4 substitute for the octahedral sites of the spinel lattice, mostly with the ionic valence of +2. The minority-spin d-electrons of the Ni 2+ ions are mainly distributed below the Fermi level (E F ), at around 3 eV; while those of the Fe 2+ ions are distributed closer to E F (~1 eV below E F ). The magnetic hysteresis curves of the Ni x Fe 3-x O 4 films measured by VSM show that as x increases, the saturation magnetization (M s ) linearly decreases. The decreasing trend is primarily attributable to the decrease in net spin magnetic moment, by the Ni 2+ (2 µ B ) substitution for octahedral Fe 2+ (4 µ B ) site.

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Phase decomposition and related structural and magnetic properties of iron-cobaltite thin films

Cited by 8 publications

References 15 publications

Structure Evolution and Multiferroic Properties in Cobalt Doped Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ Intergrowth Aurivillius Compounds

Structure Evolution and Multiferroic Properties in Cobalt Doped Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ Intergrowth Aurivillius Compounds

Preparation of iron cobaltite thin films by RF magnetron sputtering

Structural Phase Transition, Electronic Structure, and Magnetic Properties of Sol-gel-prepared Inverse-spinel Nickel-ferrites Thin Films

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