Ferromagnetic and antiferromagnetic spin-wave dispersions in a dipole-exchange coupled bi-component magnonic crystal

被引：34

作者：

Zhang, V. L. ^{[1
]}

Lim, H. S. ^{[1
]}

Lin, C. S. ^{[1
]}

Wang, Z. K. ^{[1
]}

Ng, S. C. ^{[1
]}

Kuok, M. H. ^{[1
]}

Jain, S. ^{[2
]}

Adeyeye, A. O. ^{[2
]}

Cottam, M. G. ^{[3
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

[3] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 14期

基金：

加拿大自然科学与工程研究理事会;

关键词：

antiferromagnetic materials; Brillouin spectra; cobalt; ferromagnetic materials; interface magnetism; magnons; nanostructured materials; Permalloy; spin waves;

D O I：

10.1063/1.3647952

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnon dispersion relations of the ferromagnetic and antiferromagnetic phases in a dipole-exchange coupled one-dimensional magnonic crystal comprising alternating cobalt and Permalloy nanostripes have been mapped by Brillouin spectroscopy. To elucidate the magnetization dynamics at the interfaces between stripes, the experimental data are analyzed based on a macroscopic theory under Hoffmann-type boundary conditions. Good agreement is obtained between theory and experiment for both the ferromagnetic and antiferromagnetic phases. Results suggest the existence of strong exchange coupling across the cobalt-Permalloy interfaces, comparable with the exchange coupling within each component material. (C) 2011 American Institute of Physics. [doi:10.1063/1.3647952]

引用

页数：3

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