Tunable magnonic frequency and damping in [Co/Pd]8 multilayers with variable Co layer thickness

被引：127

作者：

Pal, S. ^{[1
]}

Rana, B. ^{[1
]}

Hellwig, O. ^{[2
]}

Thomson, T. ^{[2
]}

Barman, A. ^{[1
]}

机构：

[1] SN Bose Natl Ctr Basic Sci, Dept Mat Sci, Kolkata 700098, India

[2] Hitachi Global Storage Technol, San Jose Res Ctr, San Jose, CA 95135 USA

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 08期

关键词：

MAGNETIC-ANISOTROPY; PD/CO;

D O I：

10.1063/1.3559222

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the experimental observation of collective picosecond magnetization dynamics in [Co/Pd](8) multilayers with perpendicular magnetic anisotropy. The precession frequency shows large and systematic variation from about 5 GHz to about 90 GHz with the decrease in the Co layer thickness from 1.0 to 0.22 nm due to the linear increase in the perpendicular magnetic anisotropy. The damping coefficient alpha is found to be inversely proportional to the Co layer thickness and a linear relation between the perpendicular magnetic anisotropy and alpha is established. We discuss the possible reasons behind the enhanced damping as the d-d hybridization at the interface and spin pumping. These observations are significant for the applications of these materials in spintronics and magnonic crystals. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559222]

引用

页数：3

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