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Spin polarization of CrO2 at and across an artificial barrier
J S Parker1, S M Watts, P G Ivanov
1Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, Florida 32306, USA.
Physical Review Letters
|May 15, 2002
Abstract:
We report a systematic study of the spin polarization of epitaxial CrO2 films at and across an interface using planar junctions with a superconducting counterelectrode. By chemical modification of the CrO2 surface before the deposition of the superconductor, junctions with a wide range of barrier strength were obtained. Analysis of the conductance data on these junctions, especially under Zeeman splitting of the superconducting density of states, yields consistent, close to full spin polarization for CrO2 regardless of the barrier strength.