Finite element model-simulation-based characterization of a magnetostrictive gyrosensor

Marschner, Uwe; Graham, F.; Mudivarthi, Chaitanya; Yoo, Jae Keun; Neubert, Holger; Flatau, Alison B.

doi:10.1063/1.3360771

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…The vibration of a gyrosensor has been simulated using a finite element model and magnetostriction data of FeGa alloys. 68) However, it is observed that microscopic stresses are evolved in the crystalline grains of polycrystalline FeGa alloy in a complicated manner. In a study involving stress analysis in an Fe18 at%Ga alloy by white synchrotron radiation, it was demonstrated that external stresses are heterogeneously evolved in the crystals.…”

Section: Magnetoelastic Strainsmentioning

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: Magnetoelastic Strainsmentioning

confidence: 99%

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

et al. 2019

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“…GALFENOL (Fe 100−x Ga x with ∼12 < x < ∼33) is a body‐centered cubic (BCC) magnetostrictive alloy with properties such as high tensile strength and intrinsic (atomic‐scale) magnetoelastic coupling , properties which make it useful for transduction applications. Consequently, significant research has been directed toward understanding the origin of this phenomenon and developing sensing, actuation, and energy harvesting applications based on these attributes . As with many other BCC metals , Galfenol is also auxetic in the ⟨110⟩{100} directions, and has Poisson ratio values of as low as −0.7 along these directions under purely elastic loads.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic auxetic‐like behavior in Galfenol: Experimental data and simulations

Raghunath

Flatau

Wang³

et al. 2016

Physica Status Solidi (b)

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Iron-gallium alloy (galfenol) is a body centered cubic (BCC) magnetostrictive alloy that, like many other BCC metals, is auxetic in the h110i{100} directions. For compositions of 12-33 at.% gallium, Poisson ratio (n) values as low as À0.7 are observed along these directions in response to a uniaxial elastic force (tensile tests, resonant ultrasound spectroscopy, etc.). In 2014, Raghunath and Flatau first reported that galfenol also exhibits positive strain in both these directions when the uniaxial force applied along the h110i{100} directions is provided solely by a magnetic field, i.e., with no external mechanical/elastic force or stress being applied to the alloy [Raghunath and Flatau, IEEE Trans. Magn. 50(11), 1-4 (2014)]. The observed response is a result of the intrinsic, atomic-scale, bi-directionally coupled magnetoelastic properties of these alloys. In this paper, we advance the understanding of the intrinsic atomic-scale magnetoelastic coupling of the alloy that leads to the observed magnetoelastic auxetic-like behavior by presenting simulations developed based on density functional theory, which we show match the experimental findings and energy-based simulations. The elastic anisotropy and the electronic mechanisms that lead to magnetoelastic auxetic-like behavior in galfenol are discussed.

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Magnetostrictive Devices

Dapino

Deng

Calkins

et al. 2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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Magnetostrictive materials exhibit coupling between magnetic and mechanical energies. This bidirectional energy exchange can be employed for actuation, sensing, and energy harvesting. All ferromagnetic materials exhibit the magnetostrictive effect, but only certain iron–rare earth alloys, iron–gallium alloys, amorphous metals, and iron‐ aluminum alloys exhibit sufficiently high magnetostriction for commercial use. Because the magnetostrictive effect is an intrinsic material property that is robust against external factors such as stress and cyclic fatigue, magnetostrictive devices are suitable for harsh environments. This article provides an overview ofmagnetostrictivematerials and devices, particularly focused on Metglas, Terfenol‐D, and Galfenol. Various transducer topologies are presented and discussed, along with quantification of performance metrics and experimental aspects related to understanding and harnessing the intrinsic nonlinearities of magnetostrictive materials. Selected modeling approaches considering both constitutive material behavior and system response are presented.

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Finite element model-simulation-based characterization of a magnetostrictive gyrosensor

Cited by 8 publications

References 7 publications

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

Magnetoelastic auxetic‐like behavior in Galfenol: Experimental data and simulations

Magnetostrictive Devices

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