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Further development of the microwave demagnetization and magnetization system

Research Project

Project/Area Number 23740340
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Solid earth and planetary physics
Research InstitutionKochi University

Principal Investigator

YAMAMOTO YUHJI  高知大学, 自然科学系, 助教 (00452699)

Project Period (FY) 2011-04-28 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords固体地球物理学 / 地球電磁気学 / 磁性 / マイクロ波 / 地球電磁気 / 国際研究者交流 / 中国
Outline of Final Research Achievements

We have developed a demagnetization system using 18 GHz microwaves. Initially the system was planned to be implemented with a 50 W solid state power amplifier (SSPA) but we could only implement a 10 W SSPA due to a limitation of the cost. The system uses a disc-shaped mini rock sample with a diameter of 3 mm and a thickness of 1-2 mm. To control input microwaves and monitor input and diffracted powers, a software was developed using LabView. Final tests revealed that about 60 percent of the initial remanent magnetization of a sample could be demagnetized using the system. It is expected that a complete demagnetization will be possible if the system will be implemented with a 50 W SSPA in future.

Report

(5 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (3 results)

All 2011 Other

All Presentation (3 results)

  • [Presentation] Preliminary application of the microwave LTD-DHT Shaw method to old Icelandic samples2011

    • Author(s)
      Yamamoto, Y. and Hill, M.J.
    • Organizer
      2011 International Union of Geodesy and Geophysics (IUGG) General Assembly
    • Place of Presentation
      メルボルン, オーストラリア
    • Related Report
      2011 Research-status Report
  • [Presentation] アイスランドSudurdalur 地域溶岩から推定される過去400-600 万年前の古地磁気強度2011

    • Author(s)
      山本裕二, 畠山唯達
    • Organizer
      日本地球惑星科学連合2011年大会
    • Place of Presentation
      千葉県
    • Related Report
      2011 Research-status Report
  • [Presentation] Geomagnetic field intensity inferred from 3-6 Ma lava sequences in Sudurdalur area, Iceland

    • Author(s)
      Yuhji Yamamoto, Tadahiro Hatakeyama
    • Organizer
      American Geophysical Union 2012 Fall Meeting
    • Place of Presentation
      サンフランシスコ, アメリカ
    • Related Report
      2012 Research-status Report

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Published: 2011-08-05   Modified: 2019-07-29  

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