Development of ferromagnetic oxide semiconductor thin films towards spintronics applications

K. Fujita, H. Hojo, T. Matoba, K. Hirao, K. Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Epitaxial thin films of ilmenite-hematite solid solutions with compositions of xFeTiO3-(l - x)Fe2O3 (x=0.8, 0.7, and 0.6) (in molar ratio) have been grown on α-Al2O3 (0001) substrates utilizing a pulsed laser deposition (PLD) technique, and their electrical and magnetic properties have been examined. By precisely controlling the deposition conditions such as oxygen partial pressure and substrate temperature, a single phase of well-ordered solid solutions can be obtained irrespective of the compositions. The ordered-phase thin films show ferrimagnetic properties, and the Curie temperature (Tc) is 270, 400, and over 400 K at the compositions of x=0.S, 0.7, and 0.6, respectively. The ordered-phase thin films are also semiconducting, while the conduction type changes from p- to n-types as x is decreased from 0.8 to 0.6. The Hall effect measurements at room temperature suggest the spin polarization of charged carriers.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition MS and T'08
Pages134-143
Number of pages10
Publication statusPublished - Dec 1 2008
Externally publishedYes
EventMaterials Science and Technology Conference and Exhibition, MS and T'08 - Pittsburgh, PA, United States
Duration: Oct 5 2008Oct 9 2008

Publication series

NameMaterials Science and Technology Conference and Exhibition, MS and T'08
Volume1

Other

OtherMaterials Science and Technology Conference and Exhibition, MS and T'08
CountryUnited States
CityPittsburgh, PA
Period10/5/0810/9/08

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials

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