Optical observation of closure domains in Terfenol-D single crystals

Author

Lord, D.G. ; Elliot, V. ; Clark, A.E. ; Savage, H.T. ; Teter, J.P. ; McMasters, O.D.

Author_Institution

Dept. of Phys., Salford Univ., UK

Volume

24

Issue

2

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

1716

Lastpage

1718

Abstract

Optical differential interference contrast microscopy is used to observe the topological features in surfaces of single crystal Terfenol-D (Tb_0.3Dy_0.7Fe_1.95) which arise from macroscopic lattice tilts due to the magnetostrictive strain between neighboring magnetic domains at the surface. The domain configurations observed can all be interpreted as being composed of low-energy 71 degrees and 109 degrees walls which have components of magnetization normal to the surface. Domain widths on the order of 2 mu m can readily be resolved. Observations from surfaces polished parallel to [110] and [112] are presented as a function of temperature, between 250 K and 350 K, and as a function of magnetic field applied parallel to the specimen surface.

Keywords

dysprosium alloys; iron alloys; magnetic domains; magnetic surface phenomena; magnetostriction; terbium alloys; tilt boundaries; 250 to 350 K; Tb_0.3Dy_0.7Fe_1.95; Terfenol-D single crystals; closure domains; low energy walls; macroscopic lattice tilts; magnetization; magnetostrictive strain; optical differential interference contrast microscopy; surface topological features; temperature dependence; Crystals; Interference; Iron; Lattices; Magnetic domain walls; Magnetic domains; Magnetic field induced strain; Magnetic force microscopy; Magnetostriction; Optical microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.11580

Filename

11580