Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

The stress dependence of the magnetoacoustic response in ferromagnets is based on two distinct, but not mutually independent, phenomena: stress dependence of domain structure and domain structure dependence of elastic modulus [1,2,3]. A difference in magnetoelastic energy density exists between two neighboring domains unless α, the angle between the uniaxial stress axis and magnetization vector, is the same for both domains. This difference is a net pressure acting on domain walls and, apparently, is non-zero only for 90° domain walls as long as α is different from 45° [4]. Application of uniaxial stress, hence, induces motion of 90° domain walls such that domains in iron-like ferromagnets align parallel (perpendicular) to the uniaxial tensile (compressive) stress axis. Producing local 90° domain wall motions, the same trend is valid for a stress wave propagating in these materials.

Volume

8B

Chapter

Chapter 9: Characterization of Materials

Section

Ferrous Materials and Methods

Pages

2067-2074

DOI

10.1007/978-1-4613-0817-1_262

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Review of Magnetoacoustic Residual Stress Measurement Technique for Iron-Like Ferromagnetic Alloys

La Jolla, CA

The stress dependence of the magnetoacoustic response in ferromagnets is based on two distinct, but not mutually independent, phenomena: stress dependence of domain structure and domain structure dependence of elastic modulus [1,2,3]. A difference in magnetoelastic energy density exists between two neighboring domains unless α, the angle between the uniaxial stress axis and magnetization vector, is the same for both domains. This difference is a net pressure acting on domain walls and, apparently, is non-zero only for 90° domain walls as long as α is different from 45° [4]. Application of uniaxial stress, hence, induces motion of 90° domain walls such that domains in iron-like ferromagnets align parallel (perpendicular) to the uniaxial tensile (compressive) stress axis. Producing local 90° domain wall motions, the same trend is valid for a stress wave propagating in these materials.