Correction for longitudinal mode vibration in thin slender beams

Cai, Liang; Morshed, Shakib; Prorok, Barton C.

doi:10.1063/1.2745262

Cited by 87 publications

(53 citation statements)

References 19 publications

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“…In particular, the reduction of the sensor length is an effective method as it not only increases the frequency but also decreases the weight of the sensor. 15 Therefore, miniaturizing the sensor is an effective approach to improve its performance.…”

Section: Introductionmentioning

confidence: 99%

Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors

Cai

Gooneratne

Cha

et al. 2012

Journal of Applied Physics

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MetglasTM 2826MB foils of 25–30 μm thickness with the composition of Fe40Ni38Mo4B18 have been used for magnetoelastic sensors in various applications over many years. This work is directed at the investigation of ∼3 μm thick iron-nickel-molybdenum-boron (FeNiMoB) thin films that are intended for integrated microsystems. The films are deposited on Si substrate by co-sputtering of iron-nickel (FeNi), molybdenum (Mo), and boron (B) targets. The results show that dopants of Mo and B can significantly change the microstructure and magnetic properties of FeNi materials. When FeNi is doped with only Mo its crystal structure changes from polycrystalline to amorphous with the increase of dopant concentration; the transition point is found at about 10 at. % of Mo content. A significant change in anisotropic magnetic properties of FeNi is also observed as the Mo dopant level increases. The coercivity of FeNi films doped with Mo decreases to a value less than one third of the value without dopant. Doping the FeNi with B together with Mo considerably decreases the value of coercivity and the out-of-plane magnetic anisotropy properties, and it also greatly changes the microstructure of the material. In addition, doping B to FeNiMo remarkably reduces the remanence of the material. The film material that is fabricated using an optimized process is magnetically as soft as amorphous MetglasTM 2826MB with a coercivity of less than 40 Am−1. The findings of this study provide us a better understanding of the effects of the compositions and microstructure of FeNiMoB thin film materials on their magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors

Cai

Gooneratne

Cha

et al. 2012

Journal of Applied Physics

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“…15 When the MSP biosensor with asymmetric mass loading as shown in Figure 1 is excited to vibrate along x-axis, the kinetic energy (T) and potential energy (V) of the MSP biosensor with mass loading can be given in Eq. (1) and Eq.…”

Section: Theory and Methodsmentioning

confidence: 99%

“…15 The length (l), width (w) and thickness (h s ) of the MSP biosensor are set as 1.0 mm, 0.2 mm, and 15 μm, respectively. The mass ratio per unit length ρ m A m /ρ s A s is set as 1/1000.…”

Section: Theory and Methodsmentioning

confidence: 99%

Study of “blind point” and mass sensitivity of a magnetostrictive biosensor with asymmetric mass loading

Zhang

Chai

2014

AIP Advances

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The existence of “blind point” lowers the mass sensitivity and reliability of magnetostrictive particle (MSP) based biosensors. In addition, asymmetric distribution of mass loading (e.g. bacteria) will cause the shift of “blind point” and change of mass sensitivity of an MSP based biosensor. In this work, a modal analysis method was introduced and conducted to derive the governing vibration equation for an MSP biosensor with asymmetric mass loading. The effects of asymmetric mass loading on the “blind point” shift and mass sensitivity were unveiled by solving the governing vibration equation. It was found that the plot of “blind point” shift showed an “M” shape with the valley located at a/l ∼ 0.5 and two peaks located at a/l ∼ 0.25 and a/l ∼ 0.75. In addition, the theoretical results showed that the resonance frequency shift (Δf) depends on the value of a/l (i.e. both the attached mass and mass distribution) and their relationship is nonlinear. Based on the definition of mass sensitivity (Sm), the values of Sm were derived for the selected values of a/l. The results showed that Sm decreased initially with increasing a/l, reaching the minimum, and then increased until a/l = 1. That is, the maximum mass sensitivity is obtained when a/l equals to a critical value Xc (0 < Xc < l). Based on the result, an optimal mass loading distribution design criterion for developing a more sensitive MSP based biosensor was proposed.

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“…It has been demonstrated [14] that under the above conditions, the sensor undergoes a plane-stress or biaxial state, and the observed first order resonance frequency ("resonance frequency", for short) is…”

Section: Resonance Characteristics Of the Sensorsmentioning

confidence: 97%

“…Briefly, the platform of this sensor is a magnetoelastic material which has a characteristic resonance frequency that is a function of its material properties [13], shape, physical dimensions [14] and mass of the material [15]. If an alternating magnetic field is applied with a frequency that matches this characteristic resonance frequency, a maximum shape change occurs.…”

Section: Principle Of Operationmentioning

confidence: 99%

Phage coated magnetoelastic micro-biosensors for real-time detection of Bacillus anthracis spores☆

Shen

Lakshmanan

Mathison

et al. 2009

Sensors and Actuators B: Chemical

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Correction for longitudinal mode vibration in thin slender beams

Abstract: A study of coupled flexural-longitudinal wave motion in a periodic dual-beam structure with transverse connection

Cited by 87 publications

References 19 publications

Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors

Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors

Study of “blind point” and mass sensitivity of a magnetostrictive biosensor with asymmetric mass loading

Phage coated magnetoelastic micro-biosensors for real-time detection of Bacillus anthracis spores☆

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