NDLI: Mesoscopic Magnetic/Semiconductor Heterostructures

Content Provider	IEEE Xplore Digital Library
Author	Yong Bing Xu Ahmad, E. Yong Xiong Lu Claydon, J.S. Ya Zhai van der Laan, G.
Copyright Year	2002
Abstract	We report the experimental results of Fe and Fe₃O₄ nanostructures on GaAs(100) surfaces and hybrid Ferromagnetic/Semiconductor/Ferromagnetic (FM/SC/FM) spintronic devices. Element specific x-ray magnetic circular dichroism (XMCD) measurements have shown directly that Fe atoms on the GaAs(100)-4times6 surface are ferromagnetic. Within coverages of 2.5 to 4.8 ML superparamagnetic nanoclusters are formed and exhibiting strong uniaxial anisotropy, of the order of 6.0times10⁵ erg/cm³. The coercivities of epitaxial Fe dot arrays films grown on GaAs(100) were observed to be dependent on the separation and size of the dots indicating that interdot dipolar coupling affects the magnetization processes in these dots. In addition Fe₃O₄ films grown on deformed GaAs(100) substrates have been observed to form nanostripes following the topography of the substrate and magneto-optical Kerr effect (MOKE) measurements showed that these nanostripes have uniaxial magnetic anisotropy with easy axis perpendicular to the length of the nanostripes. Meanwhile the FM/SC/FM vertical device has exhibited a biasing current dependent on MR characteristics, with a maximum change of 12% in the MR observed, indicating for the first time a large room temperature spin injection and detection
Sponsorship	IEEE Nanotechnology Council
Starting Page	455
Ending Page	458
Page Count	4
File Size	828348
File Format	PDF
ISSN	1536125X
Volume Number	5
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic semiconductors Iron Magnetic anisotropy Perpendicular magnetic anisotropy Magnetic separation Surface topography Atomic measurements Substrates Semiconductor nanostructures Magnetoelectronics spintronics Epitaxial ferromagnetic thin film ferromagnetic/semiconductor hybrid structures
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Electrical and Electronic Engineering Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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