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2013 Fiscal Year Final Research Report

Low-temperature magnetization dymanics of TM-Al-O (TM=Fe and Co) granular magnetic films

Research Project

  • PDF
Project/Area Number 23560027
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionIshinomaki Senshu University

Principal Investigator

YOSHIHARA Akira  石巻専修大学, 理工学部, 教授 (40166989)

Project Period (FY) 2011 – 2013
Keywords磁性薄膜材料 / レーザー分光学 / ブリルアン散乱 / 磁化動力学 / 低温
Research Abstract

We prepared a closed-cycle refrigerator for low-temperature Brillouin light scattering (BLS) study under external magnetic fields. We also improved the performances of our BLS apparutus for long spectrum-accumulation. With these apparutus we successfully observed scattering from super-paramagnetic (SPM) excitations for Co-Al-O films in a temparture range of between 300K and 15K under magetic fields of between 2.0kOe and 4.5 kOe.
We developed a theoretical model for SPM BLS spectrum. We could analyze the observed spectra with the theoretical model. We found an anomalous temperature behavior of the peak frequency and width at around 150 K. This anomalous behavior can be attributed to a dispersion effect due to a coupling between precession of particle magnetization and relaxation with a low activation energy and a fast relaxation time of an order of 10 ps.
We are planning extensive BLS studies of spin waves from ferromagentic thin films at low temperatures under magnetic fields.

  • Research Products

    (7 results)

All 2013 2012 2011

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results)

  • [Journal Article] Temperature dependence of the coercive force of ferromagnetic TM-Al-O (TM=Fe, Co) granular films2013

    • Author(s)
      S. Nakamura, T. Nojima, A. Yoshihara, and S. Ohnuma
    • Journal Title

      J. Kor. Phys. Soc.

      Volume: 63 Pages: 773-777

    • Peer Reviewed
  • [Journal Article] Transport and magnetic properties of ferro- magnetic Co-Al-O and Fe-Al-O granular films2011

    • Author(s)
      S. Nakamura, T. Iwashita, T. Nojima, A. Yoshihara, S. Ohnuma and H. Fujimori
    • Journal Title

      J. Phys. Condensed Matter : Conference Series

      Volume: 266, No. 012019 Pages: 1-6

    • Peer Reviewed
  • [Presentation] 強磁性TM-Al-O (TM=Fe, Co)グラニュラー膜の保持力の温度変化2013

    • Author(s)
      中村慎太郎,吉原章,大沼繁弘,野島勉
    • Organizer
      第37回日本磁気学会北大工学部
    • Place of Presentation
      札幌市
    • Year and Date
      20130900
  • [Presentation] 超常磁性Co-Al-O膜の低温磁気光散乱2013

    • Author(s)
      吉原章,三浦洋平,中村慎太郎,野島勉,大沼繁弘
    • Organizer
      第37回日本磁気学会北大工学部
    • Place of Presentation
      札幌市
    • Year and Date
      20130900
  • [Presentation] 強磁性Co-Al-Oグラニュラー膜の低温磁化と交換バイアス2013

    • Author(s)
      中村慎太郎,吉原章,大沼繁弘,野島勉
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学,東広島市
    • Year and Date
      20130300
  • [Presentation] Temperature dependence of the coercive force of ferromagnetic TM- Al-O (TM=Fe,Co) granular films2012

    • Author(s)
      S. Nakamura, T. Nojima, A. Yoshihara and S. Ohnuma
    • Organizer
      The 19-th International Conference on Magnetism (ICM-2012)
    • Place of Presentation
      Busan, Korea
    • Year and Date
      20120700
  • [Presentation] 超常磁性Co-Al-Oグラニュラー膜の磁気励起ブリルアン散乱2011

    • Author(s)
      吉原章,中村慎太郎,大沼繁弘,野島勉
    • Organizer
      第35回日本磁気学会学術講演会
    • Place of Presentation
      新潟市
    • Year and Date
      20110900

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Published: 2015-07-16  

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