Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00197 : Spin polarization measurements in Fe$_{4}$N/MgO/NbN tunnel junctions using quasiparticle tunneling spectroscopy
Author:
In spintronic applications, it is thought that Fe$_{4}$N is useful because
it has been theoretically expected to have high spin polarization.
Fe$_{4}$N/MgO/CoFeB magnetic tunnel junctions (MTJs) were fabricated, and an
inverse tunnel magnetoresistance (TMR) effect was reported by our groups.
However, spin polarization of Fe$_{4}$N is yet incompletely understood. We
investigated spin polarization of Fe$_{4}$N, using quasiparticle tunneling
spectroscopy (QTS), and the measured spin polarization of Fe$_{4}$N was
compared with that in Fe$_{4}$N/MgO/CoFeB MTJs. Spin polarization of
ferromagnetic materials can be directly measured by QTS. By using NbN and
MgO as superconducting electrode and barrier layers, respectively,
Fe$_{4}$N/MgO/NbN tunnel junctions were fabricated by magnetron sputtering.
The thickness of MgO barrier layer was varied from 1.0 to 1.5 nm. The areal
resistances of the Fe$_{4}$N/MgO/NbN tunnel junctions were close to those of
Fe$_{4}$N/MgO/CoFeB MTJs, which had the same thickness of MgO barrier layer
as those Fe$_{4}$N/MgO/NbN tunnel junctions. In QTS, spin polarization of
Fe$_{4}$N was estimated to be $\sim -$0.68. This value is larger than spin
polarization in MTJs.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.197
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