Length Scale of the Spin Seebeck Effect

被引：158

作者：

Kehlberger, Andreas ^{[1
,6
]}

Ritzmann, Ulrike ^{[2
]}

Hinzke, Denise ^{[2
]}

Guo, Er-Jia ^{[1
]}

Cramer, Joel ^{[1
]}

Jakob, Gerhard ^{[1
]}

Onbasli, Mehmet C. ^{[3
]}

Kim, Dong Hun ^{[3
]}

Ross, Caroline A. ^{[3
]}

Jungfleisch, Matthias B. ^{[4
]}

Hillebrands, Burkard

Nowak, Ulrich ^{[2
,5
]}

Klaeui, Mathias ^{[1
,5
,6
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[2] Univ Konstanz, Dept Phys, D-78457 Constance, Germany

[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[4] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[5] Tech Univ Kaiserslautern, Fachbereich Phys & Landesforschungszentrum OPTIMA, D-67663 Kaiserslautern, Germany

[6] Grad Sch Mat Sci Mainz, D-55128 Mainz, Germany

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 09期

基金：

美国国家科学基金会;

关键词：

INSULATOR; YTTRIUM; IRON;

D O I：

10.1103/PhysRevLett.115.096602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50 mu m at room temperature and 50 K. Our results reveal a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature. The observed behavior cannot be explained as an interface effect or by variations of the material parameters. Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length. This allows us to trace the origin of the observed signals to genuine bulk magnonic spin currents due to the spin Seebeck effect ruling out an interface origin and allowing us to gauge the reach of thermally excited magnons in this system for different temperatures. At low temperature, even quantitative agreement with the simulations is found.

引用

页数：5

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