Exchange-Enhanced Ultrastrong Magnon-Magnon Coupling in a Compensated Ferrimagnet

被引：108

作者：

Liensberger, Lukas ^{[1
,2
]}

Kamra, Akashdeep ^{[3
]}

Maier-Flaig, Hannes ^{[1
,2
]}

Gepraegs, Stephan ^{[1
]}

Erb, Andreas ^{[1
]}

Goennenwein, Sebastian T. B. ^{[4
]}

Gross, Rudolf ^{[1
,2
,5
,6
]}

Belzig, Wolfgang ^{[7
]}

Huebl, Hans ^{[1
,2
,5
,6
]}

Weiler, Mathias ^{[1
,2
]}

机构：

[1] Bayerische Akad Wissensch, Walther Meissner Inst, D-85748 Garching, Germany

[2] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany

[3] Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, N-7491 Trondheim, Norway

[4] Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01062 Dresden, Germany

[5] Nanosyst Initiat Munich, D-80799 Munich, Germany

[6] MCQST, D-80799 Munich, Germany

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

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 11期

关键词：

FERROMAGNETIC-RESONANCE; MOLECULAR-FIELD; SPIN;

D O I：

10.1103/PhysRevLett.123.117204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We experimentally study the spin dynamics in a gadolinium iron garnet single crystal using broadband ferromagnetic resonance. Close to the ferrimagnetic compensation temperature, we observe ultrastrong coupling of clockwise and counterclockwise magnon modes. The magnon-magnon coupling strength reaches almost 40% of the mode frequency and can be tuned by varying the direction of the external magnetic field. We theoretically explain the observed mode coupling as arising from the broken rotational symmetry due to a weak magnetocrystalline anisotropy. The effect of this anisotropy is exchange enhanced around the ferrimagnetic compensation point.

引用

页数：7

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