Research of acoustic/thermal diode effects via magnetoelastic coupling

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K21622
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II; Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: NII Yoichi 東京大学, 大学院総合文化研究科, 助教 (80708488)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 磁気弾性結合 / 表面弾性波 / マイクロ波フォノン / 非相反性 / マルチフェロイクス

Outline of Final Research Achievements

We have measured microwave phonon propagation on a hybrid multiferroic composed by a ferromagnetic Ni film on a piezoelectric LiNbO3 substrate. We have observed that nonreciprocal phonon propagation emerges around a frequency where acoustically-induced ferromagnetic resonance takes place. Based on a phenomenological theory including magnetoelastic energy, we have succeeded in understanding the phonon nonreciprocity and its angular dependence.

Free Research Field

物性物理学(実験)