Fabrication of full metal CPP-spin valves with atomic order spacer layer and their magnetoresistance effect

• Project/Area Number: 23651144
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Microdevices/Nanodevices
• Research Institution: Tohoku University
• Principal Investigator: TSUNODA Masakiyo 東北大学, 大学院・工学研究科, 准教授 (80250702)
• Research Collaborator: TAKAHASHI Hirokazu 東北大学, 大学院・工学研究科, 博士後期課程
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 磁性 / 磁気抵抗効果 / スピントロニクス / 交換磁気異方性 / スピンバルブ

Research Abstract

In order to develop a multilayer material in which magnetic moments steeply change their direction within atomic-order thickness, current-perpendicular to plane (CPP) magnetoresistance thin-film devices, consisted of Co based ferromagnetic layer and Ru spacer layer, were fabricated with UHV-sputtering method, and their transport properties were investigated. The interfacial uncompensated spins of Mn-Ir/ ferromagnetic bilayerswere also investigated with changing the ferromagnetic material. As a result, the exchange interaction at the interface and crystal structure of the ferromagnet were found to be important for large exchange anisotropy.

Research Products

• [Journal Article] Current-induced switching of exchange bias in nano-scaled magnetic tunnel junctions with a synthetic antiferromagnetic pinned layer (2012)
  • Author(s): C. T. Chao, C. Y. Kuo, L. Horng, M.Tsunoda, M. Takahashi, and J. C. Wu
  • Journal Title: Journal of Applied Physics Volume: 111巻 Issue: 7
  • DOI: 10.1063/1.3673811
  • Peer Reviewed
• [Journal Article] An atomic model calculation of exchange anisotropy and uncompensated spin element in antiferromagnetic layer : An effect of exchange coupling with various ferromagnetic materials (2012)
  • Author(s): C. Mitsumata, M. Tsunoda, H. Takahashi, and A. Sakuma
  • Journal Title: Europhysics Letters Volume: 99 Issue: 4 Pages: 47006-47006
  • DOI: 10.1209/0295-5075/99/47006
  • Peer Reviewed
• [Journal Article] Effect of Thermal Fluctuations of Magnetization on Perpendicular Exchange Anisotropy in Mn-Ir / [Co / Pt]<i>_n</i> Multilayers (2012)
  • Author(s): 高橋宏和,角田匡清,高橋研
  • Journal Title: Journal of the Magnetics Society of Japan Volume: 36 Issue: 5 Pages: 313-317
  • DOI: 10.3379/msjmag.1207R001
  • NAID: 130002112219
  • ISSN: 1882-2924, 1882-2932
  • Peer Reviewed
• [Journal Article] Perpendicular Exchange Anisotropy in Mn-Ir/Fe-Co/[Pt/Co]_4 Multilayers (2012)
  • Author(s): H. Takahashi, M. Tsunoda, and M. Takahashi
  • Journal Title: IEEE Transactions on Magnetics Volume: 48 Issue: 11 Pages: 4347-4350
  • DOI: 10.1109/tmag.2012.2196760
  • Peer Reviewed
• [Journal Article] Mn-Ir/[Co/Pt]n積層膜における磁化の熱揺らぎが垂直交換磁気異方性に与える影響 (2012)
  • Author(s): 高橋宏和，角田匡清，高橋研
  • Journal Title: Journal of Magnetics Society of Japan Volume: 36 Pages: 313-317
  • NAID: 130002112219
  • Peer Reviewed
• [Journal Article] Coupling strength with off-axial external field in magnetic tunnel junction cells (2011)
  • Author(s): C. T. Chao, C. Y. Kuo, C. C. Chen, L. Horng, Y. J. Chang, T. Wu, S. Isogmi, M. Tsunoda, M. Takahashi, and J. C. Wu
  • Journal Title: Journal of Applied Physics Volume: 109 Issue: 7
  • DOI: 10.1063/1.3560047
  • Peer Reviewed
• [Journal Article] Uncompensated antiferromagnetic moments in Mn-Ir/FM (FM=Ni-Co, Co-Fe, Fe-Ni) bilayers : Compositional dependence and its origin (2011)
  • Author(s): Hirokazu Takahashi, Yohei Kota, Masakiyo Tsunoda, Tetsuya Nakamura, Kenji Kodama, Akimasa Sakuma, Migaku Takahashi
  • Journal Title: Journal of Applied Physics Volume: 110 Issue: 12
  • DOI: 10.1063/1.3672450
  • Peer Reviewed
• [Journal Article] Soft X-ray Magnetic Circular Dichroism of a CoFe/MnIr Exchange Bias Film under Pulsed High Magnetic Field (2011)
  • Author(s): Tetsuya Nakamura, Yasuo Narumi, Toko Hirono, Misaki Hayashi, Kenji Kodama, Masakiyo Tsunoda, Shinji Isogami, Hirokazu Takahashi, Toyohiko Kinoshita, Koichi Kindo, Hiroyuki Nojiri
  • Journal Title: Applied Physics Express Volume: 4 Issue: 6 Pages: 066602-066602
  • DOI: 10.1143/apex.4.066602
  • Peer Reviewed
• [Presentation] Orientational Dependence of Perpendicular Exchange Anisotropy inMn-Ir/Co-Fe/Pd/[Co/Pd]4 Multilayers (2012)
  • Author(s): H. Takahashi and M. Tsunoda
  • Organizer: The 2nd International Conference of AUMS
  • Place of Presentation: 奈良
• [Presentation] Perpendicular Exchange Anisotropy in Mn-Ir/Fe-Co/[Pt/Co] Multilayers (2012)
  • Author(s): H. Takahashi, M. Tsunoda, and M.Takahashi
  • Organizer: IEEE International Magnetics Conference
  • Place of Presentation: バンクーバー(カ ナダ)
• [Presentation] Perpendicular Exchange Anisotropy in Mn-Ir/Fe-Co/[Pt/Co] Multilayers (2012)
  • Author(s): H. Takahashi, M. Tsunoda, and M. Takahashi
  • Organizer: IEEE International Magnetics Conference
  • Place of Presentation: バンクーバー（カナダ）
• [Presentation] Orientational Dependence of Perpendicular Exchange Anisotropy in Mn-Ir/Co-Fe/Pd/[Co/Pd]4 Multilayers (2012)
  • Author(s): H. Takahashi and M. Tsunoda
  • Organizer: The 2nd International Conference of AUMS
  • Place of Presentation: 奈良県新公会堂（奈良県）
• [Remarks]
  • URL: http://www.ecei.tohoku.ac.jp/ecei_web/Laboratory/takahashi_j_index.html