Reversal mechanism of submicron patterned CoNi/Pt multilayers

Author

Haast, M.A.M. ; Schuurhuis, J.R. ; Abelmann, L. ; Lodder, J.C. ; Popma, Th.J.

Author_Institution

MESA Res. Inst., Twente Univ., Enschede, Netherlands

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1006

Lastpage

1008

Abstract

With laser interference lithography Co₅₀Ni₅₀/Pt multilayers with perpendicular magnetic anisotropy have been patterned into regular matrices of submicron sized dots. Their magnetic properties have been studied with Vibrating Sample Magnetometry. Compared to continuous multilayers (H_c=15 kA/m) the coercivity for the patterned multilayers is much larger (H_c=115-270 kA/m). Though the hysteresis curves of 180 nm dots and 60 nm dots have identical shapes, virgin curves seem to indicate that the 180 nm dots are multidomain while the 60 nm dots are single domain. The latter has been confirmed with Magnetic Force Microscopy observations

Keywords

cobalt alloys; coercive force; ferromagnetic materials; magnetic force microscopy; magnetic hysteresis; magnetic multilayers; magnetisation reversal; nickel alloys; perpendicular magnetic anisotropy; photolithography; platinum; 180 nm; 60 nm; Co₅₀Ni₅₀-Pt; CoNi-Pt; coercivity; hysteresis curves; laser interference lithography; magnetic force microscopy; multidomain dots; perpendicular magnetic anisotropy; regular matrices; reversal mechanism; single domain dots; submicron patterned CoNi/Pt multilayers; submicron sized dots; vibrating sample magnetometry; Coercive force; Interference; Lithography; Magnetic anisotropy; Magnetic hysteresis; Magnetic multilayers; Magnetic properties; Nonhomogeneous media; Perpendicular magnetic anisotropy; Shape;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706339

Filename

706339