Parker J S, Watts S M, Ivanov P G, Xiong P
Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, Florida 32306, USA.
Phys Rev Lett. 2002 May 13;88(19):196601. doi: 10.1103/PhysRevLett.88.196601. Epub 2002 Apr 30.
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.
