Manipulation of ferromagnetism in magnetic semiconductor field effect transistors

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


Summary form only given. Hole-induced ferromagnetism in transition metal doped III-V compounds offers integration of ferromagnetism with the existing nonmagnetic III-V heterostructures. These structures allow us to explore spin-dependent phenomena in semiconductor heterostructures, which may lead us to a new form of electronics, semiconductor spintronics, where both the spin and charge degrees of freedom play critical roles (H. Ohno, Science, vol. 281, p. 951, 1998; and J. Mag. Mag. Materials, vol. 200, p. 110, 1999). Here, the author reviews recent developments in the field of III-V ferromagnetism and spin-dependent phenomena in its heterostructures, with an emphasis on electric field manipulation of ferromagnetism in FET structures. A mean-field theory (T. Dietl et al., Science, vol. 287, p. 1019, 2000; T. Dietl et al., Phys. Rev. B vol. 63, pp. 195-205, 2001) based on exchange between carrier spin and Mn spin capable of explaining the ferromagnetic transition temperatures and strain-dependent easy axis indicates that the properties of hole-induced ferromagnetism in magnetic III-V's depend critically on the hole concentration. By the use of insulating-gate field-effect transistor structures, we have demonstrated electrical switching of the ferromagnetic phase transition (H. Ohno et al., Nature, vol. 408, p. 944, 2000). We are thus beginning to learn how to control and utilize the spin degree of freedom in semiconductors. At present this is a low temperature effect. Routes to room temperature ferromagnetism are also discussed.

Original languageEnglish
Title of host publication60th Device Research Conference, DRC 2002
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages1
ISBN (Electronic)0780373170
Publication statusPublished - 2002 Jan 1
Event60th Device Research Conference, DRC 2002 - Santa Barbara, United States
Duration: 2002 Jun 242002 Jun 26

Publication series

NameDevice Research Conference - Conference Digest, DRC
ISSN (Print)1548-3770


Other60th Device Research Conference, DRC 2002
Country/TerritoryUnited States
CitySanta Barbara


  • Electrons
  • FETs
  • Information technology
  • Intelligent systems
  • Laboratories
  • Magnetic materials
  • Magnetic semiconductors
  • Material storage
  • Modems
  • Temperature

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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