Research of acoustic/thermal diode effects via magnetoelastic coupling

• 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
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• 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 / フォノン / 磁気共鳴 / フォノニクス

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.

Research Products

• [Journal Article] Microwave magnetochiral effect in the non-centrosymmetric magnet CuB2O4 (2017)
  • Author(s): Y. Nii, R. Sasaki, Y. Iguchi, and Y. Onose
  • Journal Title: J. Phys. Soc. Jpn Volume: 86 Issue: 2 Pages: 024707-024707
  • DOI: 10.7566/jpsj.86.024707
  • NAID: 210000134268
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Nonreciprocal propagation of surface acoustic wave in Ni/LiNbO3 (2017)
  • Author(s): R.Sasaki, Y. Nii, Y. Iguchi, and Y. Onose
  • Journal Title: Phys. Rev. B Volume: 95 Issue: 2 Pages: 020407-020407
  • DOI: 10.1103/physrevb.95.020407
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Magnetoelectrical control of nonreciprocal microwave response in a multiferroic helimagnet (2017)
  • Author(s): Y. Iguchi, Y. Nii, and Y. Onose
  • Journal Title: Nature Communications Volume: 印刷中
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] 圧力印加によるスキルミオン相の生成・消滅 (2016)
  • Author(s): 新居陽一、中島多朗、有馬孝尚、岩佐義宏
  • Journal Title: 応用物理 Volume: 85 Pages: 885-885
  • NAID: 130007715234
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Critical phenomena of emergent magnetic monopoles in a chiral magnet (2016)
  • Author(s): N. Kanazawa, Y. Nii, X. -X. Zhang, A. S. Mishchenko, G. De Filippis, F. Kagawa, Y. Iwasa, N. Nagaosa, and Y. Tokura
  • Journal Title: Nature Communications Volume: 7 Issue: 1 Pages: 11622-11622
  • DOI: 10.1038/ncomms11622
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Uniaxial stress control of skyrmion phase (2015)
  • Author(s): Y. Nii, T. Nakajima, A. Kikkawa, Y. Yamasaki, K. Ohishi, J. Suzuki, Y. Taguchi, T. Arima, Y. Tokura & Y. Iwasa
  • Journal Title: Nature Communications Volume: 8539 Issue: 1 Pages: 1-7
  • DOI: 10.1038/ncomms9539
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] マルチフェロイック物質BiFeO3における表面弾性波伝搬 (2017)
  • Author(s): 石井優太, 佐々木遼, 新居陽一, 伊藤利充, 小野瀬佳文
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学 豊中キャンパス(大阪府・豊中市)
  • Year and Date: 2017-03-20
• [Presentation] Magnetoelectrical control of nonreciprocal microwave response in a multiferroic helimagnet (2017)
  • Author(s): Y. Iguchi, Y. Nii, and Y. Onose
  • Organizer: American Physical Society March Meeting 2017
  • Place of Presentation: New Orleans (USA)
  • Year and Date: 2017-03-14
  • Int'l Joint Research
• [Presentation] Nonreciprocal propagation of surface acoustic waves in Ni/LiNbO3 (2017)
  • Author(s): R. Sasaki, Y. Nii, Y. Iguchi, and Y. Onose
  • Organizer: American Physical Society March Meeting 2017
  • Place of Presentation: New Orleans (USA)
  • Year and Date: 2017-03-13
  • Int'l Joint Research
• [Presentation] Magnetoelectrical control of nonreciprocal microwave response in a multiferroic helimagnet (2017)
  • Author(s): Y. Iguchi, Y. Nii, and Y. Onose
  • Organizer: CEMS-QPEC Symposium on Emergent Quantum Materials 2017
  • Place of Presentation: 東京大学本郷キャンパス(東京都・文京区)
  • Year and Date: 2017-01-18
  • Int'l Joint Research
• [Presentation] Nonreciprocal propagation of surface acoustic wave in Ni/LiNbO3 (2017)
  • Author(s): R. Sasaki, Y. Nii, Y. Iguchi, and Y. Onose
  • Organizer: CEMS-QPEC Symposium on Emergent Quantum Materials 2017
  • Place of Presentation: 東京大学本郷キャンパス(東京都・文京区)
  • Year and Date: 2017-01-18
  • Int'l Joint Research
• [Presentation] 強誘電らせん磁性体における非相反マイクロ波応答の電場制御 (2016)
  • Author(s): 井口雄介, 新居陽一, 小野瀬佳文
  • Organizer: 日本物理学会２０１６年秋季大会
  • Place of Presentation: 金沢大学角間キャンパス (石川県・金沢市)
  • Year and Date: 2016-09-13
• [Presentation] 非反転対称磁性体CuB2O4のマイクロ波応答 (2016)
  • Author(s): 新居陽一、佐々木遼、井口雄介、小野瀬佳文
  • Organizer: 日本物理学会2016年春季大会
  • Place of Presentation: 東北学院大学泉キャンパス、（宮城県仙台市）
  • Year and Date: 2016-03-22
• [Presentation] Ni/LiNbO3における表面弾性波の磁気弾性結合と非相反性 (2016)
  • Author(s): 佐々木遼、新居陽一、井口雄介、小野瀬佳文
  • Organizer: 日本物理学会2016年春季大会
  • Place of Presentation: 東北学院大学泉キャンパス、（宮城県仙台市）
  • Year and Date: 2016-03-18
• [Presentation] MnSiにおける磁気スキルミオン相の一軸応力制御 (2016)
  • Author(s): 新居陽一、中島多朗
  • Organizer: 2015年度量子ビームサイエンスフェスタ(第7回MLFシンポジウム/第33回PFシンポジウム)
  • Place of Presentation: つくば国際会議場、（茨城県つくば市）
  • Year and Date: 2016-03-15
  • Invited
• [Presentation] Mechanical manipulation of skyrmion crystal (2015)
  • Author(s): Y. Nii, T. Nakajima, A. Kikkawa, Y. Taguchi, T. Arima, Y. Tokura, and Y. Iwasa
  • Organizer: EMN summer meeting (Cancun, Mexico)
  • Place of Presentation: ウェスティンホテル、カンクン(メキシコ)
  • Year and Date: 2015-06-10
  • Int'l Joint Research / Invited
• [Presentation] Mechanical response of skyrmion crystal (2015)
  • Author(s): Y. Nii, T. Nakajima, A. Kikkawa, Y. Taguchi, T. Arima, Y. Tokura, and Y. Iwasa
  • Organizer: Workshop on “Topological magnets”
  • Place of Presentation: 理化学研究所、（埼玉県和光市）
  • Year and Date: 2015-05-26
  • Int'l Joint Research