Magnon Band Gap of a Superlattice With Antiferromagnetic Interlayer Exchange Coupling

Author

Rong-Ke Qiu ; An-Dong Huang ; Zhi-Dong Zhang ; Zhi-Yong Wang

Author_Institution

Shenyang Univ. of Technol., Shenyang, China

Volume

47

Issue

10

fYear

2011

Firstpage

3122

Lastpage

3125

Abstract

The magnon energy bands in a superlattice composed of two alternating ferromagnetic materials with antiferromagnetic interlayer exchange coupling is studied, by means of Green´s function method and the Tyablikov decoupling approximation. It is found that a modulated energy gap exists in the magnon energy band along K_x direction perpendicular to the superlattice plane. The effect of the spin quantum numbers, the anisotropies, the interlayer exchange couplings and the external magnetic field on the energy gap has been investigated.

Keywords

Green´s function methods; antiferromagnetism; ferromagnetism; magnetic anisotropy; magnons; superlattices; Green´s function method; Tyablikov decoupling approximation; alternating ferromagnetic materials; anisotropics; antiferromagnetic interlayer exchange coupling; external magnetic field; magnon band gap; modulated energy gap; spin quantum numbers; superlattice plane; Anisotropic magnetoresistance; Couplings; Magnetic multilayers; Magnetic superlattices; Perpendicular magnetic anisotropy; Anisotropy; interlayer exchange couplings; magnetic superlattice; magnon energy gap;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2155635

Filename

6027824