Study on magnetic properties of novel Manganese nitride exhibiting Weyl antiferromagnetism at room temperature

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15173
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 29020:Thin film/surface and interfacial physical properties-related
• Research Institution: Shizuoka University
• Principal Investigator: Kawaguchi Takahiko 静岡大学, 工学部, 助教 (30776480)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: エピタキシャル薄膜 / 窒化物 / ワイル磁性

Outline of Final Research Achievements

In this study, we focused on Manganese nitride Mn3AN (A= metal element), which is a candidate material of Weyl antiferromagnet with tiny leakage magnetic field and very rapid magnetic response. Mn3(Sn,Bi)N thin films were grown on MgO (001) substrates by pulsed laser deposition. As a result, we successfully obtained epitaxial thin films for Mn3(Sn,Bi)N. Clear magnetic transitions exhibit near room temperature for their thin films. Anomalous Hall effect of obtained Mn3(Sn,Bi)N thin film is quite small in spite of lower temperature than magnetic transition. This result is probably because the lattice distortion in the thin film originated from the thermal expansion coefficient difference between thin film and substrate.

Free Research Field

セラミックス薄膜

Academic Significance and Societal Importance of the Research Achievements

Mn3(Sn,Bi)N単相試料は、粉末などのバルク材料では合成が困難であったため、薄膜化による新規組成の単相試料合成は今後の材料探索において大きな意義を持つ。また、パルスレーザー堆積法を用いたマンガン系窒化物薄膜の研究報告も限られており、その作製条件によって得られる薄膜の傾向を示したという意味でも意義深い。さらにマンガン系窒化物薄膜は、本研究開始当初と比べて、この研究期間中急速に研究報告が増加したことから、本研究は社会的にも大きな波及効果をもたらすことが期待される。