Using a hybrid superconducting-ferromagnetic tip as a magnetic scanning tunneling microscope

Denis Feinberg, Guy Deutscher

Research output: Contribution to journalArticlepeer-review

Abstract

Approaching a two-component tip made of a superconductor (S) and a ferromagnet (F) from a magnetic sample allows for two distinct tunneling processes between the ferromagnets, through S: (i) Charge and spin are conserved; (ii) Charge and spin are reversed, e.g. a Cooper pair flows from S, one electron going into F, the other into the sample. At subgap voltages, this allows two currents to flow from the tip: one is insensitive to the spin polarizations and allows for surface topography, the other directly tracks the relative spin polarizations of F and the sample. The whole device acts as a STM sensitive to the spin polarization at the Fermi level (MSTM). Its sensitivity is studied and optimized with respect to the tip geometry.

Original languageEnglish
Pages (from-to)88-93
Number of pages6
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume15
Issue number2
DOIs
StatePublished - Oct 2002

Keywords

  • Point contacts, SN and SNS junction
  • Scanning tunneling microscopy
  • Spin polarized transport

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