Dependence of magnetic susceptibility on stress in textured polycrystalline Fe81.6Ga18.4 and Fe79.1Ga20.9 Galfenol alloys

Mahadevan, Arjun; Evans, Phillip G.; Dapino, Marcelo J.

doi:10.1063/1.3280374

Cited by 56 publications

(27 citation statements)

References 9 publications

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“…12,[15][16][17] Among those results, Zhan et al systematically studied the influence of strain on the static magnetic properties of FeGa films grown on the flexible substrates, 12,18,19 and the recent result indicates that FeGa alloys show a potential application in high frequency flexible microwave device. 17 However, the soft magnetic properties of FeGa films are not satisfied enough due to the relatively high conductivity and large stress of FeGa film, 13,20,21 and FeGa films also show the very high coercivity and large damping factor. 17 These properties of FeGa films are disadvantageous for the high frequency applications.…”

Section: Introductionsmentioning

confidence: 99%

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Tuning high frequency magnetic properties and damping of FeGa, FeGaN and FeGaB thin films

et al. 2017

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A series of FeGa, FeGaN and FeGaB films with varied oblique angles were deposited by sputtering method on silicon substrates, respectively. The microstructure, soft magnetism, microwave properties, and damping factor for the films were investigated. The FeGa films showed a poor high frequency magnetic property due to the large stress itself. The grain size of FeGa films was reduced by the additional N element, while the structure of FeGa films was changed from the polycrystalline to amorphous phase by the involved B element. As a result, N content can effectively improve the magnetic softness of FeGa film, but their high frequency magnetic properties were still poor both when the N2/Ar flow rate ratio is 2% and 5% during the deposition. The additional B content significantly led to the excellent magnetic softness and the self-biased ferromagnetic resonance frequency of 1.83 GHz for FeGaB film. The dampings of FeGa films were adjusted by the additional N and B contents from 0.218 to 0.139 and 0.023, respectively. The combination of these properties for FeGa films are helpful for the development of magnetostrictive microwave devices.

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Section: Introductionsmentioning

confidence: 99%

“…were deposited on silicon (100) substrates by radio frequency magnetron sputtering, respectively, and there was no presence of any native oxide layer on the film. The composition of target was fixed at Fe 80 Ga 20 (at. %), and the target diameter is 2.0 inch.…”

Section: Introductionsmentioning

confidence: 99%

Tuning high frequency magnetic properties and damping of FeGa, FeGaN and FeGaB thin films

et al. 2017

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“…16,17 Therefore, the magneto-mechanical characteristics of FeGa alloys have been extensively investigated. 18,19 As a typical ferroelectric material, BaTiO 3 (BTO) experiences different stain states through applying an electric field. [20][21][22][23] If the ferroelectricity of BTO and the magnetism of FeGa could be coupled together through the strain transfer across the interface between the two phases, it is possible to effectively realize the electric-field control of magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Electric-field control of magnetic anisotropy in Fe81Ga19/BaTiO3 heterostructure films

et al. 2014

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We investigate the control of magnetism with an electric field in Fe81Ga19(FeGa)/BaTiO3(BTO) heterostructure films. The as-prepared FeGa/BTO samples present a uniaxial magnetic anisotropy, which is ascribed to be induced by the spontaneous ferroelectric polarization of the BTO substrates. With the electric field applied on the BTO substrates increasing from 0 to 6 kV/cm, the coercivity of FeGa films measured along the BTO[110] direction increases from 28 to 41 Oe, while the squareness of the hysteresis loop decreases from 0.99 to 0.31, which indicates that the easy and hard axes of FeGa films are swapped. The ferroelectric domains of BTO substrates and the magnetic domains of FeGa films exhibit the same dependence on the applied electric fields, manifesting the strong magnetoelectric coupling between the ferroelectricity of BTO substrates and the magnetism of FeGa films.

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“…Adaptado de [23] . Figura 11 -Variação da magnetostricção em função do campo aplicado, para diversas tensões aplicadas na liga.…”

Section: Lista De Figurasunclassified

“…Nas curvas de magnetização, o aumento da tensão compressiva faz com que sejam necessários campos magnéticos maiores para atingir a saturação do material, já que esta tensão dificulta a movimentação dos domínios e ocasiona eventualmente um dobramento na curva de magnetização [2], [11], [23] .…”

Section: Liga Contendo Ferro E Alumíniounclassified

Construção de um transdutor quase-estatíco de tensão mecânica em propriedades magnéticas, aplicado a Liga (Fe0,8Al0,2)98.B2

Dias¹

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de S. D.) por todos os abraços (de recepção e despedida). Eles me fizeram perceber que não importa quanto tempo eu esteja navegando em mar aberto, sempre terei um porto seguro para retornar. Em especial, agradeço ao meu irmão (Artur B. de S. Dias) por todas as noites que passamos na "velocidade e agressão", por nos tornarmos "caras que não dormem desde o natal" e que "tem permissão executiva" ("be ready to piau!").Agradeço a minha namorada (Andressa M. Scalco) por todas as risadas e bons momentos que passamos. Sinto-me confiante e seguro com ela, pois nossas conversas diárias são como um navio resistente e veloz, que me permite navegar bem sobre calmarias e tempestades. Além disso, os melhores lanches são feitos com bastante requeijão e amor.Agradeço a minha orientadora (Cristina Bormio Nunes) pela oportunidade deste mestrado. A sincronicidade dos eventos desse trabalho mostra como as coisas não são ao acaso, já que fui resgatado do ponto de carona pelo galeão da minha orientadora, garantindo assim o meu próprio navio. Agradeço aos meus velhos amigos (Bruno S. de Lima, Mariane Capellari e MatheusMartini) pelo companheirismo, que nossa amizade continue a crescer.Agradeço também aos meus amigos Erlon Z. Santos e Marcela Gobo por todos os roles lost que fizemos. Eu sei que meu barco se distanciou, mas saibam que vocês estão guardados dentro do meu peito e não esquecerei os bons momentos que passamos. In the present research, a transducer was built to measure the changes of magnetic induction (B) and magnetostriction () for soft ferromagnetic materials in function of applied magnetic field (H) (voltage V) and mechanical stress ().The transducer comprises two excitation coils connected at a current/voltage supply (to apply the magnetic field in the magnetostrictive element) and a magnetic core, to concentrate the magnetic flux in the ferromagnetic material. The magnetostriction is measured by strain gauges, the mechanical stress is applied by a material test system (EMIC), the magnetic induction is measured using a pick-up coil connected to a fluxmeter and the acquisition of the data was measured by a Labview software. These systems measure the curve B vs. V and  vs. V for constant  and B vs.  e  vs.  for constant V. From this curves, it is possible to acquire the material´s sensibility and analyse the feasibility of then in application like sensor and actuators. Using this transducer, it was possible to characterize a FeAlB alloy and to compare it with a GALFENOL sample, which is the most used material of this class. The alloys show sensibility (up to 10 MPa) about 0,020 T/MPa to the GALFENOL and 0,012 T/MPa to FeAlB alloy. If we consider that the FeAlB alloy does not have the best chemical composition to reach the higher magnetostriction, there is a lot o thing to study, like different composition and the appropriate processing to obtain the desired texture.

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Dependence of magnetic susceptibility on stress in textured polycrystalline Fe81.6Ga18.4 and Fe79.1Ga20.9 Galfenol alloys

Cited by 56 publications

References 9 publications

Tuning high frequency magnetic properties and damping of FeGa, FeGaN and FeGaB thin films

Tuning high frequency magnetic properties and damping of FeGa, FeGaN and FeGaB thin films

Electric-field control of magnetic anisotropy in Fe81Ga19/BaTiO3 heterostructure films

Construção de um transdutor quase-estatíco de tensão mecânica em propriedades magnéticas, aplicado a Liga (Fe0,8Al0,2)98.B2

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