Hybrid Spintronic Structures With Magnetic Oxides and Heusler Alloys

Publication: Research - peer-reviewConference article – Annual report year: 2008

Documents

DOI

NullPointerException

View graph of relations

Hybrid spintronic structures, integrating half-metallic magnetic oxides and Heusler alloys with their predicted high spin polarization, are important for the development of second-generation spintronics with high-efficient spin injection. We have synthesized epitaxial magnetic oxide Fe3O4 on GaAs(100) and the unit cell of the Fe3O4 was found to be rotated by 45 degrees to match the gallium arsenide GaAs. The films were found to have a bulk-like moment down to 3-4 nm and a low coercivity indicating a high-quality magnetic interface. The magnetization hysteresis loops of the ultrathin films are controlled by uniaxial magnetic anisotropy. The dynamic response of the sample shows a heavily damped precessional response to the applied field pulses. In the Heusler alloy system of Co-2 MnGa on GaAs, we found that the magnetic moment was reduced for thicknesses down to 10 nm, which may account for the lower than expected spin-injection efficiency from the spin-light-emitting diode structures. Using the element-specific technique of X-ray magnetic circular dichroism (XMCD), the reduced spin moments were found to originate from the Mn rather than the Co atoms, and the improvement of the interface is thus needed to increase the spin injection efficiency in this system. Further studies of the I-Vcharacteristics of Fe3O4/GaAs(100) and Fe3O4/MgO/GaAs(100) show that the Fe3O4-based spintronic structures have a well-defined Schottky or tunneling barrier of moderate barrier height, which is encouraging for high-efficient spin injection.
Original languageEnglish
JournalI E E E Transactions on Magnetics
Publication date2008
Volume44
Journal number11
Pages2959-2965
ISSN0018-9464
DOIs
StatePublished

Conference

Conference2008 International Magnetics Conference
CountrySpain
CityMadrid
Period04/05/0808/05/08
Internet addresshttp://www.intermagconference.com/intermag2008/

Bibliographical note

Copyright 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

CitationsWeb of Science® Times Cited: 3

Keywords

  • spintronics, ultra-thin films, magnetic oxides, Gallium arsenide (GaAs), Heusler alloys, molecular-beam epitaxy, magnetite
Download as:
Download as PDF
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
Word

Download statistics

No data available

ID: 6486647