Controlled switching between paramagnetic and diamagnetic Meissner effects in superconductor-ferromagnet Pb-Co nanocomposites

Y. T. Xing; H. Micklitz; E. Baggio-Saitovitch; T. G. Rappoport

doi:10.1103/PhysRevB.80.224505

← Back to search

Controlled switching between paramagnetic and diamagnetic Meissner effects in superconductor-ferromagnet Pb-Co nanocomposites

Y. T. Xing, H. Micklitz, E. Baggio-Saitovitch, T. G. Rappoport

DOI 10.1103/PhysRevB.80.224505 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

A hybrid system which consists of a superconducting (SC) Pb film (100 nm thickness) containing ∼1 vol % single domain ferromagnetic (FM) Co particles of mean size ∼4.5 nm reveal unusual magnetic properties: (i) a controlled switching between the usual diamagnetic and the unusual paramagnetic Meissner effect in field cooling as well as in zero-field-cooling experiments (ii) amplification of the positive magnetization when the sample enters the SC state below Tc. These experimental findings can be explained by the formation of spontaneous vortices and the possible alignment of these vortices due to the alignment of the Co particle FM moments by an external magnetic field.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.2	Pressure not reported	onset
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown