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Magnetic properties of multilayers with strong interlayer coupling and perpendicular magnetic anisotropy

Research Project

Project/Area Number 15560571
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionUniversity of Tsukuba

Principal Investigator

KITA Eiji  Univ.of Tsukuba, Gradutae School of Pure and Applied Sciences, Professor, 大学院・数理物質科学研究科, 教授 (80134203)

Co-Investigator(Kenkyū-buntansha) OHSHIMA Kenniti  Univ.of Tsukuba, Graduate School of Pure and Applied Sciences, Professor, 大学院・数理物質科学研究科, 教授 (70109271)
YANAGIHARA Hideto  Univ.of Tsukuba, Graduate School of Pure and Applied Sciences, Assist.Prof., 大学院・数理物質科学研究科, 講師 (50302386)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsMagnetic multilayers / interlayer magnetic coupling / magneto-static energy / Magnetic anisotropy / 磁気多層膜 / エピタキシャル成長 / 磁気層間結合 / 磁歪
Research Abstract

We have investigated magnetic properties of multilayers which have both interlayer magnetic coupling and magnetic anisotropy. These two characteristics have been widely studied because they are essential properties for application to modern magnetic devices in spin-electronics fields. Co/Rh and Co/Ir were selected for the research targets since these multilayers simultaneously posses strong interlayer magnetic coupling and magnetic anisotropy. Rh and Ir have similar chemical properties because they stands at the same raw in the periodic table, namely have similar environments with outermost d electrons and almost the same lattice parameters with fcc structures. Additionally, the lattice mismatch between Co and these elements are about 7 %, relatively large, however we can still expect epitaxial growth between Co and Rh, Ir. All of the elements can be grown in the fcc structure and various growth directions are able to realized, for example (001) and (111).
The samples were made by using an MBE deposition system. To study the thickness dependence on magnetic properties, wedged layers of Co or Rh, Ir were deposited. Magnetization process was measured with a SQUID magnetometer. For Co/Rh(111) multilayres, perpendicular magnetic anisotropy was found in the films with Co layer thickness less than 12 Å. This anisotropy can be originated in local stress due to the lattice miss-match or lower symmetry at the surface. From the analysis of streak patterns in RHEED, we derived in-plane lattice parameters and estimated in-plane stress. We found the anisotropy was well reproduced by the magneto-elastic energy generated with in-plane stress. The magnetization process of (001) multilayers applying an external magnetic field perpendicular to the films shows higher salutation magnetic fields than the value expected from the demagnetization field. For this case, strong "negative" perpendicular anisotropy was found and also explainable with the same manner as the (111) case.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (7 results)

All 2005 2004 Other

All Journal Article (6 results) Publications (1 results)

  • [Journal Article] Perpendicular magnetic anisotropy of Co/Rh(111) distorted superlattices2005

    • Author(s)
      H.Tokano, H.Yanagihara, E.Kita
    • Journal Title

      Journal of Applied Physics 97

      Pages: 16103-3

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Perpendicular magnetic anisotropy of Co/Rh(111) distorted superlattices2005

    • Author(s)
      H.Tokano, H.Yanagihara, Eiji Kita
    • Journal Title

      J.Appl.Phys. 97

      Pages: 16103-16105

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Co/Rh(111)多層膜の層間結合と磁気異方性2004

    • Author(s)
      戸叶洋之, 柳原英人, 喜多英治
    • Journal Title

      日本応用磁気学会 28巻2号

      Pages: 164-167

    • NAID

      10015761007

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structure and exchange coupling in (100) oriented Co/Ir artificial alloys2004

    • Author(s)
      E.Kita, K.Suzuki, H.Itoh, H.Yanagihara, H.Tokano
    • Journal Title

      Trans. Mater. Res. Soc. Jpn. 29巻4号

      Pages: 1591-1594

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic interlayer coupling and anisotropy of Co/Rh(111) multilayers2004

    • Author(s)
      H.Tokano, H.Yanagihara, Eiji Kita
    • Journal Title

      J.Magn.Soc.Jpn. 28,No2

      Pages: 164-167

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structure and exchange coupling in (100) oriented Co/Ir artificial alloys2004

    • Author(s)
      E.Kita, K.Suzuki, H.Itoh, H.Yanagihara, H.Tokano
    • Journal Title

      Trans.Mater.Res.Soc.Jpn. 29 No.4

      Pages: 1591-1594

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 戸叶洋之, 柳原英人, 喜多英治: "Co/Rh(111)多層膜の層間結合と磁気異方性"日本応用磁気学会誌. 28巻2号. 164 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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