The energy and width of paired Neel walls in double layer M-R films

Author

Pohm, A.V. ; Comstock, C.S. ; Jiang, Z.P. ; Ranmuthu, K.T.M. ; Ranmuthu, I.W.

Author_Institution

Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2831

Lastpage

2833

Abstract

The energy and wall width of paired Neel walls are analytically examined. The walls studied are those which are perpendicular to the easy axes in double-layer MR (magnetoresistive) elements. Specifically, the material examined consisted of two 150-Å-thick magnetic layers separated by 50 Å. The anisotropy constant was assumed to be 20 Oe, the exchange constant 1.25×10^-6 erg/cm, and the saturation magnetization 983 G/4π. Wall energies ranged from 0.03 erg/cm² to 1.8 erg/cm² as the total angle of rotation across the wall varied from 60° to 270°. Wall width ranged from 2.0 μm to 0.5 μm. The wall energies were found to be approximately one eighth of those of single-layer Neel walls. The wall widths were found to vary less with total wall angle than those encountered with a single-layer Neel wall. The paired Neel walls are generally wider than those for a single-layer film

Keywords

exchange interactions (electron); magnetic anisotropy; magnetic domain walls; magnetic film stores; magnetic thin films; magnetisation; anisotropy constant; double layer magnetoresistive elements; exchange constant; magnetoresistive memories; paired Neel walls; saturation magnetization; total angle of rotation; wall energy; wall width; Anisotropic magnetoresistance; Magnetic analysis; Magnetic anisotropy; Magnetic domain walls; Magnetic materials; Magnetic separation; Magnetic switching; Perpendicular magnetic anisotropy; Power engineering and energy; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104891

Filename

104891