Title of article :
Spin-dependent tunneling in magnetic tunnel junctions with Fe nanoparticles embedded in an MgO matrix
Author/Authors :
Pham، نويسنده , , T.V. and Miwa، نويسنده , , S. and Bang، نويسنده , , Do and Nozaki، نويسنده , , T. and Bonell، نويسنده , , F. and Tamura، نويسنده , , E. and Mizuochi، نويسنده , , N. and Shinjo، نويسنده , , T. Uchikoshi T. S. Suzuki Y. Sakka، نويسنده , , Y.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
4
From page :
18
To page :
21
Abstract :
We investigated the transport properties in magnetic tunnel junctions with Fe nanoparticles (nominal thickness: tFe=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 tFe≤0.97 nm. We found an increase in the tunnel magnetoresistance when the tFe 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.
Keywords :
C. Magnetic tunnel junctions , D. Coulomb blockade effect , E. Tunneling spectroscopy , D. Tunneling magnetoresistance
Journal title :
Solid State Communications
Serial Year :
2014
Journal title :
Solid State Communications
Record number :
1794728
Link To Document :
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