Polarized Neutron Reflectivity Investigation of Periodic Magnetic Rings

Author

Ogrin, F.Y. ; Weekes, S.M. ; Cubitt, B. ; Wildes, A. ; Drew, A. ; Ross, C.A. ; Jung, W. ; Menon, R. ; Toperverg, B.

Author_Institution

Sch. of Phys., Exeter Univ.

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2731

Lastpage

2733

Abstract

Magnetic ring structures are of particular interest, due to stable remanent configurations such as the vortex state, which have potential in future magnetic random access memory (MRAM) applications. Here we report results on the first experimental study of periodic ring arrays using off-specular polarized neutron reflectivity (PNR). The experiments were performed on a 7.5 mmtimes5 mm NiFe array with an average ring diameter of 3.2 mum, 0.7 mum width, 25 nm thickness, and separation of 5.6 mum. Using polarization analysis, a spin dependent diffraction of reflected and transmitted neutron beams were investigated as a function of external applied field

Keywords

iron alloys; magnetic devices; magnetic domains; magnetic separation; neutron reflection; nickel alloys; random-access storage; 0.7 micron; 25 nm; 3.2 micron; 5 mm; 7.5 mm; NiFe; magnetic random access memory; magnetic ring structures; off-specular polarized neutron reflectivity; periodic magnetic rings; periodic ring arrays; polarized neutron reflectivity; reflected neutron beams; spin dependent diffraction; transmitted neutron beams; vortex state; Diffraction; Magnetic anisotropy; Magnetic domains; Magnetic separation; Magnetization; Materials science and technology; Neutrons; Physics; Polarization; Reflectivity; Magnetic domains; magnetization reversal; polarized neutron reflectivity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893525

Filename

4202865