Measurement of conduction-electron polarization via the pairing resonance.
We show that the pairing resonance in the Pauli-limited normal state of ultrathin superconducting Al films provides a spin-resolved probe of conduction-electron polarization in thin magnetic films. A superconductor-insulator-ferromagnet tunneling junction is used to measure the density of states in supercritical parallel magnetic fields that are well beyond the Clogston-Chandresekhar limit, thus greatly extending the field range of the tunneling density of states technique. The applicability and limitations of using the pairing resonance as a spin probe are discussed.
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Y M
YM
Xiong
P W
PW
Adams
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Catelani