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Spin-dependent tunneling in magnetic tunnel junctions with Fe nanoparticles embedded in an MgO matrix

Authors
Pham, T. V.Miwa, S.Bang, DoNozaki, T.Bonell, F.Tamura, E.Mizuochi, N.Shinjo, T.Suzuki, Y.
Issue Date
Apr-2014
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Magnetic tunnel junctions; Coulomb blockade effect; Tunneling magnetoresistance; Tunneling spectroscopy
Citation
SOLID STATE COMMUNICATIONS, v.183, pp 18 - 21
Pages
4
Indexed
SCI
SCIE
SCOPUS
Journal Title
SOLID STATE COMMUNICATIONS
Volume
183
Start Page
18
End Page
21
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/98928
DOI
10.1016/j.ssc.2013.12.023
ISSN
0038-1098
1879-2766
Abstract
We investigated the transport properties in magnetic tunnel junctions with Fe nanoparticles (nominal thickness: t(Fe)=0.17-1.37 nm) and double MgO barriers. A disappearance of the hysteresis of the Fe nanoparticle magnetization due to its room-temperature superparamagnetic behavior and a large increase in the electrical resistance due to the Coulomb blockade effect were observed for t(Fe) <= 0.97 nm. We found an increase in the tunnel magnetoresistance when the tie decreases, which can be understood as enhancement of the spin polarization for the Fe particles that are smaller in size. Dip and shoulder structures that appeared in the first differential conductance spectra are also discussed. (C) 2014 Published by Elsevier Ltd.
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College of Science and Technology > Department of Display and Semiconductor Physics > 1. Journal Articles

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