Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite

被引：26

作者：

Chun, Sae Hwan ^{[1
]}

Shin, Kwang Woo ^{[1
]}

Kim, Hyung Joon ^{[1
]}

Jung, Seonghoon ^{[2
]}

Park, Jaehun ^{[2
]}

Bahk, Young-Mi ^{[3
]}

Park, Hyeong-Ryeol ^{[3
]}

Kyoung, Jisoo ^{[3
]}

Choi, Da-Hye ^{[4
]}

Kim, Dai-Sik ^{[3
]}

Park, Gun-Sik ^{[4
]}

Mitchell, J. F. ^{[5
]}

Kim, Kee Hoon ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, CeNSCMR, Seoul 08826, South Korea

[2] Pohang Accelerator Lab, Pohang 37673, Gyeongbuk, South Korea

[3] Seoul Natl Univ, Dept Phys & Astron, Nano Opt Grp, Seoul 08826, South Korea

[4] Seoul Natl Univ, Dept Phys & Astron, Ctr THz Driven Biomed Syst, Seoul 08826, South Korea

[5] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60540 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

Ferrite - Hamiltonians - Terahertz spectroscopy - Magnetism - Barium compounds - Iron compounds - Strontium compounds - Electric fields;

D O I：

10.1103/PhysRevLett.120.027202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An electromagnon in the magnetoelectric (ME) hexaferrite Ba-0.5 Sr-2.5 Co-2 Fe-24 O-41 (Co-2 Z-type) single crystal is identified by time-domain terahertz (THz) spectroscopy. The associated THz resonance is active on the electric field (E-omega) of the THz light parallel to the c axis (parallel to [001]), whose spectral weight develops at a markedly high temperature, coinciding with a transverse conical magnetic order below 410 K. The resonance frequency of 1.03 THz at 20 K changes -8.7% and +5.8% under external magnetic field (H) of 2 kOe along [001] and [120], respectively. A model Hamiltonian describing the conical magnetic order elucidates that the dynamical ME effect arises from antiphase motion of spins which are coupled with modulating electric dipoles through the exchange striction mechanism. Moreover, the calculated frequency shift points to the key role of the Dzyaloshinskii-Moriya interaction that is altered by static electric polarization change under different H.

引用

页数：6

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