Critical suppression of spin Seebeck effect by magnetic fields

被引：168

作者：

Kikkawa, Takashi ^{[1
,2
]}

Uchida, Ken-ichi ^{[1
,3
]}

Daimon, Shunsuke ^{[1
]}

Qiu, Zhiyong ^{[2
,4
]}

Shiomi, Yuki ^{[1
,4
]}

Saitoh, Eiji ^{[1
,2
,4
,5
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[4] Japan Sci & Technol Agcy, Spin Quantum Rectificat Project, ERATO, Sendai, Miyagi 9808577, Japan

[5] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 06期

关键词：

YTTRIUM-IRON-GARNET; THERMAL-CONDUCTIVITY; CALORITRONICS; TEMPERATURE; RELAXATION; RESONANCE; INSULATOR; MAGNONS;

D O I：

10.1103/PhysRevB.92.064413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The longitudinal spin Seebeck effect (LSSE) in Pt/Y3Fe5O12 (YIG) junction systems has been investigated at various magnetic fields and temperatures. We found that the LSSE voltage in a Pt/YIG-slab system is suppressed by applying high magnetic fields and this suppression is critically enhanced at low temperatures. The field-induced suppression of the LSSE in the Pt/YIG-slab system is too large at around room temperature to be explained simply by considering the effect of the Zeeman gap in magnon excitation. This result requires us to introduce a magnon-frequency-dependent mechanism into the scenario of LSSE; low-frequency magnons dominantly contribute to the LSSE. The magnetic field dependence of the LSSE voltage was observed to change by changing the thickness of YIG, suggesting that the thermospin conversion by the low-frequency magnons is suppressed in thin YIG films due to the long characteristic lengths of such magnons.

引用

页数：9

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