Helicity-Changing Brillouin Light Scattering by Magnons in a Ferromagnetic Crystal

被引：34

作者：

Hisatomi, R. ^{[1
]}

Noguchi, A. ^{[2
]}

Yamazaki, R. ^{[1
]}

Nakata, Y. ^{[1
]}

Gloppe, A. ^{[1
]}

Nakamura, Y. ^{[1
,3
]}

Usami, K. ^{[1
]}

机构：

[1] Univ Tokyo, RCAST, Meguro Ku, Tokyo 1538904, Japan

[2] Univ Tokyo, KIS, Meguro Ku, Tokyo 1538904, Japan

[3] RIKEN, CEMS, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 20期

关键词：

SPIN; WAVES;

D O I：

10.1103/PhysRevLett.123.207401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Brillouin light scattering in ferromagnetic materials usually involves one magnon and two photons and their total angular momentum is conserved. Here, we experimentally demonstrate the presence of a helicity-changing two-magnon Brillouin light scattering in a ferromagnetic crystal, which can be viewed as a four-wave mixing process involving two magnons and two photons. Moreover, we observe an unconventional helicity-changing one-magnon Brillouin light scattering, which apparently infringes the conservation law of the angular momentum. We show that the crystal angular momentum intervenes to compensate the missing angular momentum in the latter scattering process.

引用

页数：5

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