Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films

The Gilbert damping of ferromagnetic materials is arguably the most important but least understood phenomenological parameter that dictates real-time magnetization dynamics. Understanding the physical origin of the Gilbert damping is highly relevant to developing future fast switching spintronics de...

Full description

Saved in:
Bibliographic Details
Published in:Scientific reports 2016-03, Vol.6 (1), p.22890-22890, Article 22890
Main Authors: Zhao, Yuelei, Song, Qi, Yang, See-Hun, Su, Tang, Yuan, Wei, Parkin, Stuart S. P., Shi, Jing, Han, Wei
Format: Article
Language:English
Subjects:
639/301/119/997
639/925/357/997
Humanities and Social Sciences
Magnetism
multidisciplinary
Random access memory
Science
Temperature effects
Thin films
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The Gilbert damping of ferromagnetic materials is arguably the most important but least understood phenomenological parameter that dictates real-time magnetization dynamics. Understanding the physical origin of the Gilbert damping is highly relevant to developing future fast switching spintronics devices such as magnetic sensors and magnetic random access memory. Here, we report an experimental study of temperature-dependent Gilbert damping in permalloy (Py) thin films of varying thicknesses by ferromagnetic resonance. From the thickness dependence, two independent contributions to the Gilbert damping are identified, namely bulk damping and surface damping. Of particular interest, bulk damping decreases monotonically as the temperature decreases, while surface damping shows an enhancement peak at the temperature of ~50 K. These results provide an important insight to the physical origin of the Gilbert damping in ultrathin magnetic films.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep22890