• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study on basic properties and applications of spin-polarized electron conduction in ferromagnetic tunneling junctions

Research Project

Project/Area Number 06650376
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Electronic materials/Electric materials
Research InstitutionKyushu Kyoritsu University

Principal Investigator

GONDO Yasuo  Kyushu Kyoritsu University, Faculty of Engineering, Professor, 工学部, 教授 (50017852)

Co-Investigator(Kenkyū-buntansha) NOZAWA Tadao  Kyushu Kyoritsu University, Faculty of Engineering, Professor, 工学部, 教授 (10268790)
SHOJI Fumiya  Kyushu Kyoritsu University, Faculty of Engineering, Professor, 工学部, 教授 (00093419)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsFerromagnetic tunneling / Ferromagnetic multilayr / Giant magnetoresistance effect (GMR) / Spin-polarized electron / Inter-magnetic-layr interaction / Magnetic domain structure / Exchange-coupled bilayrs / Spin valve Effect (SV)
Research Abstract

It is interesting to note the similarity between the phenomenon of the giant magnetoresistance (GMR) and that of spin-dependent electron tunneling between the both electrodes of ferromagnetic tunneling junctions. (Spin valve effect.) The present research, therefore, has attracted considerable attention both from practical and fundamental point of views.
The present study was focused on the magnetization process, the magnetoresistance and the magnetic domain structure in the simplest bilayr structure composed of soft Ni_<80>Fe_<20> (t_s) /hard Fe (t_h), in which direct positive exchange-coupling takes plce. Here their thickness t_s and t_h are below the critical thickness t_c. The coercive force and the magnetoresistance in the exchange-coupled bilayr film depend on the thickness ratio ts/ (t_s+t_h). For thicknesses below t_c, it is expected the both films act as a single film with a coercive force between those of the individual films. Under such circumstances, the spins in the soft film exhibit a continuous rotation as in the Bloch walls generated parallel to the film plane. It was found the magnetoresistance in the exchange-coupled bilayrs is explained in terms of the continuous rotation of the spins in the layrs, as a superposition of the spin valve effect and the ordinary anisotropic magnetoresistance.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Y. Gondo and Y. Suezawa: "Magnetoresistance and magnetic properties of ferromagnetic multilayers" Thin Solid Films. (5月発表予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Gondo and Y.Suezawa: "Magnetoresistance and magnetic properties of ferromagnetic multilayrs" Thin Solid Films. (to be published in May, 1996).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Gondo and Y. Suezawa: "Magnetoresistance and magnetic properties of ferromagnetic multilayers" Thin Solid Films. (5月発表予定). (1996)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1994-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi