Electromagnon driven by dinamics of the complex spin order parameter

2014 Fiscal Year Final Research Report

• Project/Area Number: 24340073
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: KIMURA Shojiro 東北大学, 金属材料研究所, 准教授 (20379316)
• Co-Investigator(Kenkyū-buntansha): HAGIWARA Masayuki 大阪大学, 理学(系)研究科(研究院), 教授 (10221491)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: エレクトロマグノン / 電気磁気効果 / フラストレート磁性体

Outline of Final Research Achievements

We have demonstrated that a dynamic magneto-electric phenomenon called "electromagnon", for which magnon is excited by the electric component of light, can be driven by dynamics of the vector spin chirality in the frustrated magnet. Furthermore, we suggested that such a phenomenon also occurs in quantum spin gap systems due to the spin current mechanism, which brings about a electric polarization proportional to the vector spin chirality. According to this idea, we succeeded in observing ferroelectricity induced by Bose-Einstein condensation of magnon quasi-particles.

Free Research Field

強磁場物性