#### Event Title

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

#### 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

#### Copyright Owner

Springer-Verlag US

#### Copyright Date

January 1989

#### Language

en

#### File Format

application/pdf

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.