Clarification of origin of high magnetic anisotropy and controlling lattice parameters in films for Mn-based layered compounds

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630289
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Tohoku University
• Principal Investigator: Umetsu Rie 東北大学, 金属材料研究所, 准教授 (60422086)
• Co-Investigator(Renkei-kenkyūsha): Yuito Y. 早稲田大学, ナノ・ライフ創新研究機構, 准教授 (50591997) ; Takeuchi T. 早稲田大学, ナノ・ライフ創新研究機構, 准教授 (60421228) ; Mitsui Y. 鹿児島大学, 大学院理工学研究科, 准教授 (90649782)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 結晶磁気異方性 / 磁気モーメント / キュリー温度 / 交換相互作用

Outline of Final Research Achievements

Mn-based layered compounds have been kwon to indicate large magnetic anisotropy. Such ferromagnetic materials are promising candidates to high-density memory and spintronics devices. In the case of the layered compounds, where the magnetic moment is governed by the constituent Mn atoms, in-plane and/or inter-planer distances between the Mn atoms will play important role in the magnetism. In the present study, magnetic measurements and structural identifications were carried out in order to investigate the correlation between the magnetic properties and tetragonality of the structure. Specimens of MnAlGe that were partially substituted by Si or Sn instead of Al were fabricated. It was found that the lattice parameters shrink with increasing the Si content. In addition, magnetization and the Curie temperature were also degraded. There is a tendency that the Curie temperature correlates to the length of the c-axis, that is, the inter-planer distance between the Mn atoms.

Free Research Field

磁性材料