Spin Screening and Antiscreening in a Ferromagnet/Superconductor Heterojunction

Abstract

We present a theoretical study of spin screening effects in a ferromagnet/superconductor (F/S) heterojunction. It is shown that the magnetic moment of the ferromagnet is screened or antiscreened, depending on the polarization of the electrons at the Fermi level. If the polarization is determined by the electrons of the majority (minority) spin band then the magnetic moment of the ferromagnet is screened (antiscreened) by the electrons in the superconductor. We propose experiments that may confirm our theory: for ferromagnetic alloys with certain concentration of Fe or Ni ions there will be screening or antiscreening respectively. Different configurations for the density of states are also discussed.

5 pages; 4 figures. to be published in Phys. Rev, B

References in corpus (8)

• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• Theory of Half Metal-Superconductor Heterostructures
• Josephson current in superconductor-ferromagnet structures with a nonhomogeneous magnetization
• Nonmonotonic critical temperature in superconductor/ferromagnet bilayers
• Induced Ferromagnetism due to Superconductivity in Superconductor-Ferromagnet structures
• Inhomogeneous magnetism induced in a superconductor at superconductor-ferromagnet interface
• Spin screening of magnetic moments in superconductors
• Layered ferromagnet-superconductor structures: the $\pi$ state and proximity effects

Cited by in corpus (5)

• Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
• Intrinsic Paramagnetic Meissner Effect due to s-wave Odd-Frequency Superconductivity
• Evidence for Induced Magnetization in Superconductor-Ferromagnet Hetero-structures: a Scanning Tunnelling Spectroscopy Study
• Ballistic Josephson junctions in the presence of generic spin dependent fields
• Absence of magnetic interactions in Ni-Nb ferromagnet-superconductor bilayers