Self-organized criticality and phase problem in magnetoacoustic emission burst in ferromagnets

Author

Namkung, M. ; Wincheski, B.

Author_Institution

NASA Langley Res. Center, Hampton, VA

fYear

1993

fDate

31 Oct-3 Nov 1993

Firstpage

753

Abstract

Two types of ferromagnets, pure iron and steel with varying geometry and microstructural properties, were prepared for the present study of magnetoacoustic emission (MAE). The purpose was to separate the effects of structural property variations from changes caused by differences in the sample geometry. The position and shape of the leading MAE sub-burst and its variation among the samples are explained by magnetic anisotropy and the results of numerical simulations which utilized the concept of self-organized criticality (SOC). The amplitude and duration of the second sub-burst, which previously was thought to occur as a result of a complicated interaction between non-180° domain walls and lattice defects, can easily be explained by the results of our simulation

Keywords

acoustic emission; ferromagnetic properties of substances; iron; magnetic anisotropy; magnetoacoustic effects; steel; Fe; domain walls; ferromagnets; lattice defects; magnetic anisotropy; magnetoacoustic emission burst; microstructural properties; phase problem; pure Fe; pure iron; self-organized criticality; steel; Geometry; Iron; Magnetic anisotropy; Magnetic domain walls; Magnetic properties; Magnetic separation; Numerical simulation; Perpendicular magnetic anisotropy; Shape; Steel;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1993. Proceedings., IEEE 1993

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1993.339512

Filename

339512