Variable SAW delay line using amorphous TbFe&amp;lt;inf&amp;gt;2&amp;lt;/inf&amp;gt;film

Yamaguchi, M.; Hashimoto, Ken–ya; Kogo, Hiroshi; Naoe, M.

doi:10.1109/tmag.1980.1060738

Cited by 48 publications

(22 citation statements)

References 7 publications

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“…TbFe 2 thin films are also chosen as magnetostrictive material. TbFe 2 has been used in previous studies [12] but always in its amorphous phase, which does not show the record saturation magnetostriction of the single-crystal compound. Even if the best crystalline quality is not achieved on the LNO 41Y cut (see Ref.…”

Section: Tbfe 2 -Based Systemmentioning

confidence: 99%

“…By using single magnetostrictive materials or composites with enhanced magnetoelectric coefficients, magnetic SAW (MSAW) sensors have been proposed during the last ten years [7][8][9][10]. Proofs of concept have been proposed by combining either Ni [9][10][11], amorphous TbFe 2 [12], or (CoFe=CoTb) multilayers [13] with LiNbO 3 (LNO) or quartz substrates. As far as the geometry is concerned, most of the devices are based on magnetic thin films deposited in the gap between the input and output interdigital transducers (IDTs) of a delay line [12], while the use of the SAW resonator remains confidential [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies report the SAW response without clear indication regarding the film or the IDT's magnetic properties, while this is crucial to understand and control the SAW response. The exact roles of the magnetic anisotropy, the dynamic electromechanical coupling, or the propagation direction are, for example, still debated, as shown by the variety of interpretations proposed for MSAW response [9,[11][12][13]. The majority of works also focused on the acoustic response for magnetic fields applied in the plane of the device, neglecting the case where the field is applied perpendicular to the plane and its link to the magnetic behavior in this configuration.…”

Section: Introductionmentioning

confidence: 99%

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Unipolar and Bipolar High-Magnetic-Field Sensors Based on Surface Acoustic Wave Resonators

et al. 2017

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While surface acoustic wave (SAW) sensors have been used to measure temperature, pressure, strains, and low magnetic fields, the capability to measure bipolar fields and high fields is lacking. In this paper, we report magnetic surface acoustic wave sensors that consist of interdigital transducers made of a single magnetostrictive material, either Ni or TbFe 2 , or based on exchange-biased (Co=IrMn) multilayers. By controlling the ferromagnet magnetic properties, high-field sensors can be obtained with unipolar or bipolar responses. The issue of hysteretic response of the ferromagnetic material is especially addressed, and the control of the magnetic properties ensures the reversible behavior in the SAW response.

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Section: Tbfe 2 -Based Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unipolar and Bipolar High-Magnetic-Field Sensors Based on Surface Acoustic Wave Resonators

et al. 2017

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“…Note that in simulated results, Q is estimated by the inverse of the fractional width between frequencies where the real part of the admittance Y becomes the half height of its peak [20]. According to previously published paper [21] the variation of frequency (i.e. phase velocity) and Q factor versus magnetic field intensity shown in Fig.…”

Section: Figmentioning

confidence: 99%

Magnetic field SAW sensors based on magnetostrictive-piezoelectric layered structures: FEM modeling and experimental validation

Elhosni

Elmazria

Petit-Watelot

et al. 2016

Sensors and Actuators A: Physical

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This study describes the numerical implementation of accurate and fully coupled physical models in order to investigate the sensitivity of Surface Acoustic Wave (SAW) devices using the magnetoelastic interaction with an external magnetic field. The model was first validated using experimental data previously published by Kadota et al., obtained with SAW resonators based on quartz substrates and nickel InterDigital Transducers (IDTs). The model was then used to optimize the geometry of a new magnetostrictive-piezoelectric layered structure (Ni/ZnO/IDT/LiNbO3), regarding its sensitivity to the magnetic field intensity. The optimized structure was designed and fabricated and experimental results show a good correlation with the numerical modeling. Simulations also show that if alumina is used instead of ZnO, the Ni/Al2O3/IDT/LiNbO3 structure exhibits a sensitivity that is 9 times higher than the one based on ZnO.

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“…8,9) However, such SAW devices are large and cannot be applied to a passive wireless sensing system because their Q is very small.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Surface Acoustic Wave Magnetic Sensors Composed of Various Ni Electrode Structures

Kadota¹,

Ito²

2012

Jpn. J. Appl. Phys.

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A shear horizontal type of surface acoustic wave (SAW) magnetic sensor composed of a magnetostrictive Ni electrode and an ST-cut 90 X quartz substrate was fabricated. In this study, in order to obtain a higher magnetic sensitivity, one-port SAW resonators composed of three kinds of Ni electrode structures on the ST-cut 90 X quartz, namely, (a) grooved Ni electrodes, (b) additional overlaid Ni films on grooved Ni electrodes, and (c) Ni electrodes on the quartz, were fabricated and measured. In addition to these, a SAW resonator composed of a magnetostrictive TbFe 2 film electrode, which has a larger magnetostrictivity than the Ni film, on the ST-cut 90 X quartz was also fabricated. Their characteristics are examined. #

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Variable SAW delay line using amorphous TbFe<inf>2</inf>film

Cited by 48 publications

References 7 publications

Unipolar and Bipolar High-Magnetic-Field Sensors Based on Surface Acoustic Wave Resonators

Unipolar and Bipolar High-Magnetic-Field Sensors Based on Surface Acoustic Wave Resonators

Magnetic field SAW sensors based on magnetostrictive-piezoelectric layered structures: FEM modeling and experimental validation

Sensitivity of Surface Acoustic Wave Magnetic Sensors Composed of Various Ni Electrode Structures

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