NDLI: Magnetoviscoelastic Ferrofluid-Based Magnetometer

Content Provider	IEEE Xplore Digital Library
Author	Hatipoglu, G. Tadigadapa, S.
Copyright Year	1992
Abstract	In this paper, we present a novel concept for magnetic sensing that is based upon the sensitive monitoring of the magnetoviscoelastic effects in magnetic nanoparticle containing ferrofluids using micromachined shear mode bulk acoustic wave quartz crystal resonators (μQCR). The unique sensor concept is based on the application of, hitherto unexplored, magnetic field induced viscoelastic response of a thin interfacial ferrofluid layer placed atop a high-frequency shear wave quartz resonator, which can be sensitively monitored through the at-resonance impedance characteristics of the resonator. The high magnetic susceptibility of ferrofluid suspensions results in the modulation of the viscoelasticity due to applied magnetic fields. A bias magnetic field perpendicular to the resonator surface was applied to realize a dense agglomeration of the ferrofluid particles at the immediate interface of the resonator surface. Viscoelastic changes due to in-plane incident magnetic field shifts the at-resonance conductance characteristics of μQCR, and is tracked in real time to achieve a novel magnetic sensing mechanism to detect and quantify the low-frequency low strength magnetic fields. For improved sensitivity, the in-plane sensed magnetic flux density is concentrated using a high relative permeability (μ_r = 7000) thin film of Metglas (Fe₈₅B₅Si₁₀) deposited on the resonator electrode. Furthermore, by patterning the Metglas film in a bow-tie shape and aligned at the center of the μQCR electrode, both 2-D vector sensing and improvement in the sensitivity were achieved. Using these improvements, a minimum detectable field of 1.5 nT/√ Hz at 1 Hz has been experimentally demonstrated.
Sponsorship	IEEE Electron Devices Society American Society of Mechanical Engineering (ASME)
Starting Page	170
Ending Page	178
Page Count	9
File Size	2043851
File Format	PDF
ISSN	10577157
Volume Number	25
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetometers Amorphous magnetic materials Magnetic resonance Magnetoacoustic effects Magnetoelectric effects Superconducting magnets Magnetic domains FeBSi. Ferrofluid magnetoviscous effect magnetoviscoelastic effect acoustic wave resonator quartz Metglas Fe₈₅B₅Si₁₀ FeBSi Fe85B5Si10
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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