Inductive detection of magnetostrictive resonance

Park, Jang-ik; Lee, SangGap; Yu, In Kyu; Seo, Yongho

doi:10.1016/j.sna.2007.06.016

Cited by 2 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We believe that these resonances are due to ultrasonic waves in the Terfenol-D grains that are excited by a magnetostrictive mechanism. Similar resonances have been reported for other magnetostrictive materials with comparable Q-factors [30,31], though to our knowledge, this is the first such observation in Terfenol-D. Constructive and destructive interferences between neighboring resonances cause strong positive and negative variations in the spectrum.…”

supporting

confidence: 86%

Cavity Optomechanical Magnetometer

et al. 2012

View full text Add to dashboard Cite

A cavity optomechanical magnetometer is demonstrated. The magnetic field induced expansion of a magnetostrictive material is resonantly transduced onto the physical structure of a highly compliant optical microresonator, and read-out optically with ultra-high sensitivity. A peak magnetic field sensitivity of 400 nT Hz −1/2 is achieved, with theoretical modeling predicting the possibility of sensitivities below 1 pT Hz −1/2 . This chipbased magnetometer combines high-sensitivity and large dynamic range with small size and room temperature operation.Ultra-low field magnetometers are essential components for a wide range of practical applications including geology, mineral exploration, archaeology, defence and medicine [1]. The field is dominated by superconducting quantum interference devices (SQUIDs) operating at cryogenic temperatures [2]. Magnetometers capable of room temperature operation offer significant advantages both in terms of operational costs and range of applications. The state-of-the-art are magnetostrictive magnetometers with sensitivities in the range of fT Hz −1/2 [3, 4], and atomic magnetometers which achieve impressive sensitivities as low as 160 aT Hz −1/2 [5] but with limited dynamic range due to the nonlinear Zeeman effect [2,6]. Recently, significant effort has been made to miniaturize room temperature magnetometers. However both atomic and magnetostrictive magnetometers remain generally limited to millimeter or centimeter size scales. Smaller microscale magnetometers have many potential applications in biology, medicine, and condensed matter physics [7,8]. A particularly important application is magnetic resonance imaging, where by placing the magnetometer in close proximity to the sample both sensitivity and resolution may be enhanced [9], potentially enabling detection of nuclear spin noise [10], imaging of neural networks [7], and advances in areas of medicine such as magneto-cardiography[1, 6] and magneto-encephalography [11].In the past few years, rapid progress has been achieved on NV center based magnetometers. They combine sensitivities as low as 4 nT Hz −1/2 with room temperature operation, optical readout and nanoscale size [12] and are predicted theoretically to reach the fT Hz −1/2 range [13]. This has allowed three-dimensional magnetic field imaging at the micro scale using ensembles of NV-centers [7], and magnetic resonance [14] and field imaging[13] at the nanoscale using single NV centers. In spite of these extraordinary achievements applications are hampered by fabrication issues and the intricacy of the read-out schemes [15]. Furthermore miniaturization is limitied by the bulky read-out optics, the magnetic field coils for state preparation and the microwave excitation device [7].In this letter we present the concept of a cavity optomechanical field sensor which combines room temperature operation and high sensitivity with large dynamic range and small size. The sensor leverages results from the emergent field of cavity optomechanics where ultra-sensitive force and positi...

show abstract

supporting

confidence: 86%

Cavity Optomechanical Magnetometer

et al. 2012

View full text Add to dashboard Cite

show abstract

“…It is a known method for studying magnetization induced resonant peaks. 10 In this work, a pulsed resonance method is used for systematic analysis and identification of factors contributing to signal ringing in unilateral NMR sensors. The findings of this study reveal resonances from three predominant sources namely: electrical, vibrational and material.…”

Section: Unilateral Nuclear Magnetic Resonance (Nmr) Techniquesmentioning

confidence: 99%

“…Prior works 9,10 describe that variations in magnetization can lead to occurence of mechanical vibrations in structures. These vibrations, often termed magneto-acoustic noise are dependent on the Schematic representation of measurement system.…”

Section: Theorymentioning

confidence: 99%

Detection and estimation of magnetization induced resonances in unilateral nuclear magnetic resonance (NMR) sensors

et al. 2017

View full text Add to dashboard Cite

In this work a systematic identification of factors contributing to signal ringing in unilateral nuclear magnetic resonance (NMR) sensors is conducted. Resonant peaks that originate due to multiple factors such as NMR, electrical, magneto-acoustic, core material response, eddy currents and other factors were observed. The peaks caused by the measurement system or electrical resonances and induced magnet vibrations are further analyzed. They appear in every measurement and are considered as interference to signals received from the magnetic core. Forming a distinction between different peaks is essential in identifying the primary contribution to the captured resonant signal. The measurements for the magnetic core indicate that the magnetization induced resonant peaks of the core have relatively higher amplitudes and shorter decay times at low frequencies.

show abstract

Inductive detection of magnetostrictive resonance

Cited by 2 publications

References 23 publications

Cavity Optomechanical Magnetometer

Cavity Optomechanical Magnetometer

Detection and estimation of magnetization induced resonances in unilateral nuclear magnetic resonance (NMR) sensors

Contact Info

Product

Resources

About