Direct Measurement of Magnon Temperature: New Insight into Magnon-Phonon Coupling in Magnetic Insulators

被引：109

作者：

Agrawal, M. ^{[1
,2
,3
]}

Vasyuchka, V. I. ^{[1
,2
]}

Serga, A. A. ^{[1
,2
]}

Karenowska, A. D. ^{[4
]}

Melkov, G. A. ^{[5
]}

Hillebrands, B. ^{[1
,2
]}

机构：

[1] Tech Univ Kaiserslautern, Fachbereich Phys, D-67663 Kaiserslautern, Germany

[2] Tech Univ Kaiserslautern, Landesforschungszentrum OPTIMAS, D-67663 Kaiserslautern, Germany

[3] Grad Sch Mat Sci Mainz, D-67663 Kaiserslautern, Germany

[4] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[5] Taras Shevchenko Natl Univ Kyiv, Fac Radiophys, UA-01601 Kiev, Ukraine

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 10期

关键词：

SPIN; FILMS; RELAXATION; SPECTRA; DRAG;

D O I：

10.1103/PhysRevLett.111.107204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present spatially resolved measurements of the magnon temperature in a magnetic insulator subject to a thermal gradient. Our data reveal an unexpectedly close correspondence between the spatial dependencies of the exchange magnon and phonon temperatures. These results indicate that if-as is currently thought-the transverse spin Seebeck effect is caused by a temperature difference between the magnon and phonon baths, it must be the case that the magnon temperature is spectrally nonuniform and that the effect is driven by the sparsely populated dipolar region of the magnon spectrum.

引用

页数：5

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