Elastic modulus measurement of thin films coated onto magnetoelastic ribbons

Author

Schmidt, Stefan ; Grimes, Craig A.

Author_Institution

Dept. of Electr. Eng., Kentucky Univ., Lexington, KY, USA

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2731

Lastpage

2733

Abstract

A model is presented to describe the change of the resonant frequency of a magnetoelastic sensor when the sensor is coated with a material of given elasticity. With a mass load coated on the surface of the sensor, its characteristic resonant frequency changes depending on the ratio of the sound velocities in the sensor and the coating. A measurement technique is derived that allows the determination of Young´s modulus of elasticity of thin film coatings, with thickness greater than approximately 75 nm, based on the measurement of mass and resonant frequency of a sensor before and after coating. Comparing the measurement to the model delivers the value of Young´s modulus of elasticity for a coating of known density

Keywords

Young´s modulus; acoustic wave velocity; elastic moduli measurement; magnetic sensors; magnetoelastic effects; thin films; Young modulus; coating mass; elastic modulus measurement; magnetoelastic ribbon sensor; resonant frequency; sound velocity; thin film; Acoustic sensors; Coatings; Elasticity; Magnetic materials; Magnetic resonance; Magnetic sensors; Resonant frequency; Sensor phenomena and characterization; Thin film sensors; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951289

Filename

951289