Magnetic coupling between two Ni-Fe layers separated by SiO

Author

Masuda, Masahiro ; Utsunomiya, Tomoaki ; Fujii, Teruya ; Uchiyama, S.

Author_Institution

Mie University, Tsu, Japan

Volume

Issue

fYear

1972

fDate

9/1/1972 12:00:00 AM

Firstpage

279

Lastpage

279

Abstract

The magnetic coupling between the magnetization in two nonmagnetostrictive Ni-Fe layers separated by a SiO layer has been investigated by means of a transverse susceptibility measurement. The main results are that 1) the coupling energy Ec per Unit area of the multilayered film has a form of $E_{c}= -A \\cos (\\phi_{1}-\\phi_{2})$ , where $\\phi_{1}-\\phi_{2}$ is the angle between the magnetization vectors in the two Ni-Fe layers, and 2) the dependence of the coupling constant on the thickness b of the intermediate SiO layer can be interpreted quantitatively by the combination of the coupling energy due to Néel\´s topography model and that due to the magnetostatic interaction between the magnetic free poles appearing at the edges of the two Ni-Fe layers. The former coupling energy is given by $E_{c1} = -frac{p}{2\\sqrt {2}}\\omega ^{2}M^{2} \\exp(-\\sqrt {2}pb) \\cos (\\phi_{1}-\\phi_{2})$ where $p=2\\pi/L$ and $L$ and $w$ are the wavelength and the amplitude of the undulation of the interface between Ni-Fe and SiO layers, respectively. The latter is given by $E_{c2} = frac{2M^{2}D^{2}}{R} \\ln (frac{R}{D+b}) \\cos (\\phi_{1}-\\phi_{2})$ where $D$ is the thickness of each Ni-Fe layer, and $R$ is the radius of the film.

Keywords

Iron-nickel films; Multilayer magnetic films; Nickel-iron films; Couplings; Magnetic films; Magnetic separation; Magnetic susceptibility; Magnetization; Magnetostatic waves; Surfaces;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1972.1067489

Filename

1067489

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1051120