Growth of Fe-Ga Alloy Single Crystals by the Czochralski Method and Their Application to Vibration Power Generator

Fujieda, Shun; Suzuki, Shigeru; Minato, Akihiko; Fukuda, Tsuguo; Ueno, Takahiro

doi:10.1109/tmag.2014.2331139

Cited by 32 publications

(20 citation statements)

References 17 publications

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“…This is because magnetic fluxes are generated by the inverse magnetostriction (Villari effect) by external stress; this is utilized in vibration energy harvesting. 81) Therefore, it is important to control the primary movement of 90°domain walls in the inverse magnetostriction using the moderate magnetic field, to efficiently utilize the inverse magnetostriction in FeGa alloys. The importance of the relationship between the magnetostriction and magnetic domain have also been discussed in studies on the other iron-based alloys.…”

Section: Model Of Domain Structuresmentioning

confidence: 99%

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

et al. 2019

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This paper provides an overview of recent studies on the anisotropy of magnetostriction of functional iron-based alloys with the bodycentered cubic (bcc) structure; these are potential ferromagnetic materials for use in actuators and sensors at ambient temperature. The magnetostrictive properties of these functional iron-based alloys (such as FeGa, FeAl, and FeGe alloys) are known to strongly depend on the crystallographic orientation. In these functional iron-based alloys, non-Joulian magnetostriction, in which volume is not conserved, was observed; generally, the Joulian magnetostriction in a volume is not altered by magnetic fields. As the magnetostrictive properties of these ironbased alloys are correlated to their elastic properties through the magnetoelastic effect, their elastic properties have also been investigated using single crystals of iron-based alloys. In the present paper, we discuss the characteristic features of the anisotropy of magnetostriction and inverse magnetostriction, which occur when magnetic fields and external stresses, respectively, are applied. In order to clarify the microscopic processes underlying the magnetostriction and inverse magnetostriction, the alterations in the magnetic domains by magnetic fields and external stresses were observed. The results revealed that the magnetic domain structure in the functional iron-based alloys is altered in a complex manner when applied with external fields. For example, it was demonstrated that unique motions of different types of Bloch domain walls are observed with the application of magnetic fields or external stresses along specific directions of single crystals of FeGa alloys. The characteristic features of the motion of the domain walls are likely to correspond to the occurrence of magnetostriction and inverse magnetostriction, in which magnetic fluxes are induced during alternative vibration.

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Section: Model Of Domain Structuresmentioning

confidence: 99%

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

et al. 2019

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“…[1][2][3] Fe-Ga alloys are, for example, used as functional materials for vibration energy harvesting. [4][5][6] Surface of practical materials plays an important role in technological applications; that is, surface properties such as corrosion resistance are influenced by the surface chemical composition and state of alloys. 7 Because surface state changes with the annealing conditions, it is required to characterize the chemical composition and state of the surface of 8 It is also reported that gallium is easily oxidized to form thin oxides at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Because Fe–Ga alloys are new magnetostrictive materials, they are promising as smart materials for application in actuators and sensors 1–3 . Fe–Ga alloys are, for example, used as functional materials for vibration energy harvesting 4–6 . Surface of practical materials plays an important role in technological applications; that is, surface properties such as corrosion resistance are influenced by the surface chemical composition and state of alloys 7 .…”

Section: Introductionmentioning

confidence: 99%

Surface characterization of functional iron–gallium alloys annealed under different conditions

Kawamata

Shinoda

Sugiyama

et al. 2020

Surface & Interface Analysis

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Fe-Ga alloys are functional magnetostrictive materials, which are promising for application in actuators and sensors. Because surface properties of these alloys such as corrosion resistance are important in technological applications, it is required to characterize the chemical composition and state of the surface of these alloys, which depend on annealing conditions. In this study, X-ray absorption spectroscopy (XAS) and secondary ion mass spectrometry (SIMS) were used to characterize surface layers formed on the Fe-Ga alloys annealed under different atmospheric conditions. The XAS spectra of the annealed sample showed that the amount of gallium in the surface layers increased due to annealing, whereas the XAS spectra of the aspolished alloys revealed that the amounts of iron and gallium arise from the bulk composition. The XAS spectra of the alloys annealed in argon-hydrogen with residual oxygen showed that gallium is increased for its preferential oxidation. SIMS depth profile also showed the enrichment of gallium on the surface and the inhomogeneous distribution of iron on the surface layers.

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“…4,5) Fabrication of a single crystal has also been attempted, which has contributed for understanding the nature of magnetostriction in Fe-Ga alloys. [6][7][8] The texture formation by thermomechanical processing has also been suggested, which can realize flat-sheet forming and texture/microstructure control, simultaneously. Na and Falatau successfully formed Goss texture ({011} < 100 > ) by applying hot/worm-rolling and annealing.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Magnetostrictive Properties of Fe-15mol%Ga Alloy by Texture Formation during High Temperature Uniaxial Compression Deformation

et al. 2017

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The texture control of Fe-Ga solid solution alloy is examined by high temperature deformation, based on the previously suggested mechanism of high temperature deformation texture formation, "preferential dynamic grain growth (PDGG)". As the result of uniaxial compression deformation of Fe-15 mol% Ga alloy at 1 173 K, sharp alignment of < 001 > along the compression axis was observed. Microstructural observation by EBSD revealed that the < 001 > alignment was attributable to the growth of < 001 > oriented grains. The observed textures and microstructures were similar to those seen in the previous studies of Fe-Si alloys, in which the activation of PDGG was confirmed. Based on these facts, it is concluded that PDGG can be applied as a texture control technique for Fe-Ga alloy. The deformed sample showed larger saturation magnetostriction than the sample without deformation, indicating the effectiveness of the texture control by high temperature deformation.

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Growth of Fe-Ga Alloy Single Crystals by the Czochralski Method and Their Application to Vibration Power Generator

Cited by 32 publications

References 17 publications

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

Surface characterization of functional iron–gallium alloys annealed under different conditions

Improvement of Magnetostrictive Properties of Fe-15mol%Ga Alloy by Texture Formation during High Temperature Uniaxial Compression Deformation

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