Barkhausen effect and discontinuous magnetostriction in Terfenol-D

Journal Article · Tue Nov 15 04:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.342356· OSTI ID:6749824

Jiles, D C; Ostenson, J E; Owen, C V; Chang, T T

Measurements of magnetostriction lambda, magnetic Barkhausen effect (MBE), and magnetic induction B have been made as a function of magnetic field H in a number of specimens of Tb/sub 0.3/Dy/sub 0.7/Fe/sub 1.9/ prepared recently at Ames Laboratory. These results showed marked variations in properties from specimen to specimen. For example, the saturation magnetostriction of the materials under a compressive load of 14 MPa (2000 psi) varied from 1500 to 2200 x 10/sup -6/. However, it was noticed that in the high-performance, high-magnetostriction specimens a common feature was a very rapid change in magnetostriction with field in the range 400--500 Oe. Barkhausen measurements taken on two extreme specimens from the group also revealed very different signals, in particular the high-performance material was found to have a distinctive double peak in Barkhausen activity, one peak of which corresponded to the rapid change in magnetostriction, while the other occurred at the flat region of the magnetostriction versus field curve, corresponding to little or no change in magnetostriction.

• Research Organization: Ames Laboratory, Iowa State University, Ames, Iowa 50011
• OSTI ID: 6749824
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:10; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
DATA
DOMAIN STRUCTURE
DYSPROSIUM ALLOYS
EXPERIMENTAL DATA
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETOSTRICTION
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
TERBIUM ALLOYS