Magnon-fluxon interaction in a ferromagnet/superconductor heterostructure

被引：103

作者：

Dobrovolskiy, O. V. ^{[1
,2
]}

Sachser, R. ^{[1
]}

Braecher, T. ^{[3
,4
]}

Boettcher, T. ^{[3
,4
,5
]}

Kruglyak, V. V. ^{[6
]}

Vovk, R. V. ^{[2
]}

Shklovskij, V. A. ^{[2
]}

Huth, M. ^{[1
]}

Hillebrands, B. ^{[3
,4
]}

Chumak, A. V. ^{[3
,4
]}

机构：

[1] Goethe Univ Frankfurt Main, Inst Phys, Frankfurt, Germany

[2] V Karazin Natl Univ, Dept Phys, Kharkov, Ukraine

[3] Tech Univ Kaiserslautern, Fachbereich Phys, Kaiserslautern, Germany

[4] Tech Univ Kaiserslautern, Landesforschungszentrum OPTIMAS, Kaiserslautern, Germany

[5] Johannes Gutenberg Univ Mainz, Mat Sci Mainz MAINZ, Mainz, Germany

[6] Univ Exeter, Sch Phys & Astron, Exeter, Devon, England

来源：

NATURE PHYSICS | 2019年 / 15卷 / 05期

基金：

欧洲研究理事会;

关键词：

ROOM-TEMPERATURE; SPIN; SUPERCONDUCTORS;

D O I：

10.1038/s41567-019-0428-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ferromagnetism and superconductivity are most fundamental phenomena in condensed-matter physics. Entailing opposite spin orders, they share an important conceptual similarity: disturbances in magnetic ordering in magnetic materials can propagate in the form of spin waves (magnons) while magnetic fields penetrate superconductors as a lattice of magnetic flux quanta (fluxons). Despite a rich choice of wave and quantum phenomena predicted, magnon-fluxon coupling has not been observed experimentally so far. Here, we clearly evidence the interaction of spin waves with a flux lattice in ferromagnet/superconductor Py/Nb bilayers. We demonstrate that, in this system, the magnon frequency spectrum exhibits a Bloch-like band structure that can be tuned by the biasing magnetic field. Furthermore, we observe Doppler shifts in the frequency spectra of spin waves scattered on a flux lattice moving under the action of a transport current in the superconductor.

引用

页码：477 / +

页数：7

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