Study on the preparation of epitaxial thin films of rare earth-transition metal ordered alloys

• Project/Area Number: 17K14660
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Yokohama National University (2018-2019); Kogakuin University (2017)
• Principal Investigator: Ohtake Mitsuru 横浜国立大学, 大学院工学研究院, 准教授 (60611415)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 硬磁性材料 / 希土類－遷移金属合金 / 薄膜 / 結晶工学 / エピタキシャル成長 / 希土類-遷移金属合金 / 電気・電子材料 / 磁性材料

Outline of Final Research Achievements

The formation technologies of epitaxial thin films of RT5 ordered alloys consisting of rare-earth (R) and transition (T) metals are developed. The crystallization of RT5 ordered phase is promoted by employing an R or T element with lower melting point. Furthermore, the ordered phase formation is enhanced by partially substituting T site with Cu atom. The present study clarifies the formation conditions of hard magnetic RT5 alloy epitaxial films.

Academic Significance and Societal Importance of the Research Achievements

本研究により、RT5合金膜のRおよびTサイトの元素選択に関する課題が明確となった。そして、元素選択および多元化により結晶性が優れたRT5合金膜の形成可能性が増大することが示され、それに伴い、構造および磁気特性の制御範囲の更なる拡張も期待される。本研究の技術は、硬磁性RT5合金膜の形成基本技術として高い可能性を持つと考えられる。

Research Products

• [Journal Article] Ordered phase formation in Sm-Co1-xCux and Er-Co1-xCux alloy films prepared on Cr(100) single-crystal underlayer (2019)
  • Author(s): Mitsuru Ohtake, Kana Serizawa, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
  • Journal Title: Journal of Magnetism and Magnetic Materials Volume: 482 Pages: 75-78
  • DOI: 10.1016/j.jmmm.2019.03.008
  • Peer Reviewed
• [Journal Article] Preparation of Er(Co,Cu)5 Alloy Thin Films on Cr(211) Underlayer (2018)
  • Author(s): Mitsuru Ohtake, Kana Serizawa, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
  • Journal Title: IEEE Transactions on Magnetics Volume: 54 Issue: 6 Pages: 1-4
  • DOI: 10.1109/tmag.2018.2817618
  • Peer Reviewed
• [Journal Article] 単結晶基板上に形成したエピタキシャルRCo5規則合金薄膜の構造解析 (2017)
  • Author(s): 大竹充, 落合亮真, 堀田裕介, 山田真, 二本正昭, 桐野文良, 稲葉信幸
  • Journal Title: 電子情報通信学会 技術研究報告 Volume: 117-80 Pages: 23-28
• [Presentation] Ordered Phase Formation in Sm-Co1-xCux and Er-Co1-xCux Alloy Films Prepared on Cr(100) Single-Crystal Underlayer (2018)
  • Author(s): Mitsuru Ohtake, Kana Serizawa, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
  • Organizer: The 9th Joint European Magnetic Symposia
  • Int'l Joint Research
• [Presentation] Preparation of Er(Co,Cu)5 Alloy Single-Crystal Thin Films on Cr(211) Underlayer (2017)
  • Author(s): Mitsuru Ohtake, Ryo Ochiai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
  • Organizer: The 4th International Symposium on Advanced Magnetic Materials and Applications
  • Int'l Joint Research
• [Presentation] Effect of Cu/Co Compositionon the Ordered Phase Formation in Sm-Co1-xCux and Er-Co1-xCux Alloy FilmsDeposited on Cr(100) Single-Crystal Underlayer (2017)
  • Author(s): Mitsuru Ohtake, Ryoma Ochiai, Ataru Suzuki, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
  • Organizer: The 62nd Annual Conference on Magnetism and Magnetic Materials
  • Int'l Joint Research
• [Presentation] Cr(100)単結晶下地層に形成したSm-Co1-xCuxおよびEr-Co1-yCuy合金薄膜の構造解析 (2017)
  • Author(s): 大竹充, 落合亮真, 鈴木中, 二本正昭, 桐野文良, 稲葉信幸
  • Organizer: 第41回日本磁気学会学術講演会
• [Presentation] Preparation of RCo5 (R = Sm, Gd, Y, Er) Ordered Alloy Epitaxial Thin Films on Single-Crystal Substrates (2017)
  • Author(s): Mitsuru Ohtake, Ryoma Ochiai, Yusuke Hotta, Makoto Yamada, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
  • Organizer: The 18th International Symposium on Applied Electromagnetics and Mechanics
  • Int'l Joint Research
• [Presentation] 大竹充, 落合亮真, 山田真, 二本正昭, 桐野文良, 稲葉信幸 (2017)
  • Author(s): 単結晶基板上に形成したエピタキシャルRCo5規則合金薄膜の構造解析
  • Organizer: 磁気記録・情報ストレージ研究会