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ホイスラー合金層を用いた多結晶面直電流型巨大磁気抵抗素子の高出力化

Research Project

Project/Area Number 15J00221
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Physical properties of metals/Metal-base materials
Research InstitutionNational Institute for Materials Science (2016)
University of Tsukuba (2015)

Principal Investigator

ドゥ イェ  国立研究開発法人物質・材料研究機構, 磁性・スピントロニクス材料研究拠点, 外来研究者

Project Period (FY) 2015-04-24 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2016: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2015: ¥900,000 (Direct Cost: ¥900,000)
KeywordsSpin orbitronics / giant magnetoresistance
Outline of Annual Research Achievements

For the topic of CPP-MR, we have developed a Mg-Ti-O (MTO)-based tri-layer spacer and obtained large MR output in CPP-MR devices using it. Specifically, with a tri-layer spacer of Ag/MTO/Ag, large delta-Vmax over 10 mV is obtained (highest of 16 mV) in our CPP-MR devices with RA of 200-300 mΩ μm2. We find that the large MR output is very likely to originate from the formation of metallic Ag channels penetrating the MTO layer.
For the topic of spin current generation, we have studied the spin Hall magnetoresistance (SMR) in non-magnetic/ferromagnetic (NM/FM) bilayer with novel conductive NM layer. As a result, considerable SMR ratio has been observed in such a bilayer stack, which is comparable to the SMR magnitude observed in stacks with NM being a noble metal such as Pt. The origin of such a SMR can be related to the large spin-orbit coupling in the NM layer or the Rashba-Edelstein effect at the NM/FM interfaces. On the other hand, we have studied the SMR in NM1/FM/NM2 tri-layer stack to investigate how a second interface affects the overall spin-orbit torques (SOTs) in such a system. As a result, we have found that the SOTs are strongly related to the spin diffusion length of FM layer and NM2 layer placed upon it, and specifically, related to the spin transport transparency at the FM/NM2 interfaces. By calculating the respective effective spin mixing conductance of the systems, we quantitatively evaluate the damping-like and field-like SOTs in such a system, providing useful information to the control of SOTs at NM/FM interfaces.

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • Research Products

    (7 results)

All 2016 2015

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Acknowledgement Compliant: 2 results) Presentation (3 results) (of which Int'l Joint Research: 3 results) Patent(Industrial Property Rights) (2 results) (of which Overseas: 1 results)

  • [Journal Article] Polycrystalline CPP-GMR Pseudospin Valves Using 001 Textured Co2Fe(Ga0.5Ge0.5) Layer Grown on a Conductive (Mg0.5Ti0.5)O Buffer Layer / Polycrystalline CPP-GMR Pseudospin Valves Using 001 Textured Co2Fe(Ga0.5Ge0.5) Layer Grown on a Conductive (Mg0.5Ti0.5)O Buffer Layer2015

    • Author(s)
      Y. Du, T. Furubayashi, Y.K. Takahashi, Y. Sakuraba and K. Hono
    • Journal Title

      IEEE TRANSACTIONS ON MAGNETICS

      Volume: 51 Issue: 11 Pages: 4401204-14

    • DOI

      10.1109/tmag.2015.2442592

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Large magnetoresistance in current-perpendicular-to-plane pseudo spin-valves using Co2Fe(Ga0.5Ge0.5) Heusler alloy and AgZn spacer / Large magnetoresistance in current-perpendicular-to-plane pseudo spin-valves using Co2Fe(Ga0.5Ge0.5) Heusler alloy and AgZn spacer2015

    • Author(s)
      Y. Du, T. Furubayashi, T.T. Sasaki, Y. Sakuraba, Y.K. Takahashi and K. Hono
    • Journal Title

      Applied Physics Letters

      Volume: 107 Issue: 11 Pages: 112405-15

    • DOI

      10.1063/1.4930229

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Large Voltage Output In Current-Perpendicular-To-Plane Magnetoresistance Pseudo Spin-Valves Using Mg-Ti-O Spacer Material2016

    • Author(s)
      Ye Du, Tomoya Nakatani, Yuya Sakuraba, Takao Furubayashi, Yukiko Takahashi, Taisuke Sasaki, Kazuhiro Hono
    • Organizer
      61st Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      New Orleans, USA
    • Year and Date
      2016-10-31
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CPP-GMR devices using Co2Fe(Ga0.5Ge0.5) Heusler alloy and a AgZn alloy spacer2016

    • Author(s)
      Ye Du, Takao Furubayashi, Taisuke Sasaki, Yuya Sakuraba, Yukiko Takahashi, Kazuhiro Hono
    • Organizer
      13th Joint MMM/Intermag Conference
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2016-01-11
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Polycrystalline CPP-GMR devices using < 001> textured Co2Fe(Ga0.5Ge0.5) Heusler alloy layer and conductive Mg0.5Ti0.5Ox buffer layer2015

    • Author(s)
      Ye Du, Takao Furubayashi, Yukiko Takahashi, Yuya Sakuraba, Kazuhiro Hono
    • Organizer
      IEEE International Magnetics Coference
    • Place of Presentation
      Beijing, China
    • Year and Date
      2015-05-11
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] Current-perpendicular-to-plane magneto-resistance effect element2015

    • Inventor(s)
      Ye Du et al.
    • Industrial Property Rights Holder
      Ye Du et al.
    • Industrial Property Rights Type
      特許
    • Filing Date
      2015-11-05
    • Related Report
      2015 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] Magneto-resistance element and its fabrication method2015

    • Inventor(s)
      Ye Du et al.
    • Industrial Property Rights Holder
      Ye Du et al.
    • Industrial Property Rights Type
      特許
    • Filing Date
      2015-06-01
    • Related Report
      2015 Annual Research Report

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Published: 2015-11-26   Modified: 2024-03-26  

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