Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00161 : Nb doped TiN as a superconducting electrode for spin polarization measurements of oxides
Author:
Spin Polarized tunneling (SPT) measurements are an unambiguous
way of
measuring the interface spin polarization (SP) of oxide thin
films and
interfaces. SPT uses a superconducting electrode as a spin
detector, probing
within $\sim $1 meV of the Fermi level. However the commonly used
superconductor, namely Al, is not suitable for oxides due to its
strong
chemical affinity for oxygen. Nitrides like TiN and NbN
alleviates this
problem. Here we propose the use of Nb doped TiN. The critical
temperature
(T$_{c})$ and magnetic field (H$_{c})$ for TiN are too low for
practical SPT
measurements. While NbN has a higher T$_{c}$ and H$_{c}$, its high
spin-orbit scattering rate makes it less ideal for SPT [1]. TiNbN
should
provide a sufficiently high H$_{c}$ and T$_{c}$ while maintaining a
sufficiently low spin-orbit scattering rate for high-resolution SPT
measurements. We present measurements of known high SP oxides (
LaSrMnO$_{3})$ and of all-oxide spin-filter devices (LSMO/STO/NFO).
\\[4pt]
[1] Hyunsoo Yang \textit{et al}. Appl. Phys. Lett. \textbf{88},
182501 (2006)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.161
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