Magnetism of CoFe2O4 thin films annealed under the magnetic field

Dai, Ying; Dai, Jianming; Tang, Xianwu; Zi, Zhenfa; Zhang, K.J.; Zhu, Xuebin; Yang, Jie; Sun, Yan

doi:10.1016/j.jmmm.2015.06.089

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…The main drawback of these techniques is that they require sophisticated and expensive vacuum‐based equipment. On the other side, efficient and low‐cost chemical methods based on solutions have been proposed to simplify the preparation of thin films, [11] including methods such as hydrothermal processing, [12] chemical solution deposition, [13,14] and sol‐gel chemistry [15] . In this last approach, the material deposition step is greatly simplified, and straightforward techniques, such as spin‐coating or dip‐coating, can be used.…”

Section: Introductionmentioning

confidence: 99%

Deep‐UV Lithography of Nanocomposite Thin Films into Magnetooptical Gratings with Submicron Periodicity

et al. 2020

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Incompatibility of conventional magneto-optical (MO) materials with photonicsystem fabrication processes constitutes a major technological roadblock limiting their integration into photonic devices, especially for micro-or nano-patterned films. This paper proposes a photolithography approach toward MO micro-and nano-patterns, based on hybrid photosensitive matrices doped with magnetic nanoparticles to concentrations as high as 20%vol. The as prepared and characterized nanocomposite thin films exhibit excellent MO properties: a high Faraday rotation (5300 °/cm), comparable with the best existing materials that nevertheless require much more involved processes. The photosensitive matrices allow patterned gratings with a wide range of periods (100 µm to 500 nm), using a simple procedure at room temperature. The fabricated gratings exhibit welldefined regular structures and resolutions suitable for optical applications, including those at telecommunications wavelengths. Finally, direct applications of the proposed material and its associated process are demonstrated on two examples: 1) a magneto-optical grating in free-space and 2) in combination with a waveguide. The obtained optical and MO results are consistent with simulations.

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Section: Introductionmentioning

confidence: 99%

Deep‐UV Lithography of Nanocomposite Thin Films into Magnetooptical Gratings with Submicron Periodicity

et al. 2020

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“…As expected, it can be observed that the sample is biphasic (CoFe 2 O 4 and BNT-BT 0.08 ). All the diffraction peaks could be indexed with a spinel structure (Fd3m space group) for CoFe 2 O 4 phase (JCPDS: 04-005-7078) 26 and a perovskite rhombohedral structure for Bi 0.5 Na 0.5 TiO 3 rhombohedral phase (JCPDS: 04-015-0482) 27 , respectively.The rhombohedral phase of BNT-BT 0.08 layer at room temperature, is characterized by (003)/(021) peak splitting between 39° and 41° and, a single (202) peak between 45° and 48°, as indicates the JCPDS: 04-015-0482 27 while BNT-BT 0.08 tetragonal phase shows splitting of the (200) and (220) peaks at 2 θ ~ 46.5° (JCPDS: 04-011-3919) 28 . Figure 2(b) shows a not symmetrical peak at 45°, that can be deconvoluted in the (200) and (220) peaks, suggesting the existence of BNT-BT 0.08 tetragonal phase.…”

Section: Resultsmentioning

confidence: 99%

Probing the dielectric, piezoelectric and magnetic behavior of CoFe2O4/BNT-BT0.08 composite thin film fabricated by sol-gel and spin-coating methods

Cernea

Vasile

Surdu

et al. 2018

Sci Rep

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We investigated in this paper a novel bilayer composite obtained by sol-gel and spin coating of the ferroelectric 0.92Na0.5Bi0.5TiO3–0.08BaTiO3 (abbreviated as BNT-BT0.08) and ferromagnetic CoFe2O4 phases, for miniature low-frequency magnetic sensors and piezoelectric sensors. This heterostructure, deposited on Si-Pt substrate (Si-Pt/CoFe2O4/BNT-BT0.08), was characterized using selected method such as: X-ray diffraction, dielectric spectroscopy, piezoelectric force microscopy, SQUID magnetometry, atomic force microscopy/magnetic force microscopy, and advanced methods of transmission electron microscopy. CoFe2O4/BNT-BT0.08 ferromagnetic–piezoelectric thin films show good magnetization, dielectric constant and piezoelectric response. The results of analyses and measurements reveal that this heterostructure can have applications in high-performance magnetoelectric devices at room temperature.

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“…4 Variations of the strain of the CFO layers for the films with and without magnetic annealing. The inset shows change rate of the strains vs the film thickness size, grain boundary, and strain in the films [20]. And it is well known that the smaller grains in the materials usually lead to greater internal strain [21], which would clamp the magnetic domain-wall motion and decrease the M s of the magnetic materials.…”

Section: Resultsmentioning

confidence: 99%

Structure and Magnetic Property Changes of 2–2-Type BaTiO3–CoFe2O4 Composite Thin Films Induced by Magnetic Field Annealing

Dai

Gao

Liu

et al. 2016

J Supercond Nov Magn

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BaTiO 3 -CoFe 2 O 4 composite thin films with different thicknesses were fabricated via chemical solution deposition. Magnetic annealing and non-field annealing processes were applied in the sintering process, respectively. Variations of the structure and magnetic properties of the composite films induced by the magnetic annealing were investigated. It is found that the mean grain size and grain boundary are increased and decreased, respectively. For the magnetic-annealed films, the internal strain is reduced with the increase of film thickness. Magnetic measurements show that the M s is also increased with the film thickness and the magnetic-annealed films have bigger M s values than the non-field-annealed films. Based on the experimental results, it can be concluded that the effect of magnetic annealing on the structure and properties of the composite films is decreased with the increase of film thickness.

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Magnetism of CoFe2O4 thin films annealed under the magnetic field

Cited by 16 publications

References 26 publications

Deep‐UV Lithography of Nanocomposite Thin Films into Magnetooptical Gratings with Submicron Periodicity

Deep‐UV Lithography of Nanocomposite Thin Films into Magnetooptical Gratings with Submicron Periodicity

Probing the dielectric, piezoelectric and magnetic behavior of CoFe2O4/BNT-BT0.08 composite thin film fabricated by sol-gel and spin-coating methods

Structure and Magnetic Property Changes of 2–2-Type BaTiO3–CoFe2O4 Composite Thin Films Induced by Magnetic Field Annealing

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