Magnetic volcanos in gadolinium Langmuir-Blodgett films

A.M. Tishin, O.V. Snigirev, G.B. Khomutov, Jakob Bohr

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Magnetic, structural and electronic properties of Langmuir–Blodgett films with incorporated Gd3+ ions has been detected using a scanning DC SQUID microscope, scanning electron microscope and X-ray diffraction. The magnetic images of 28 and 50 layer thick films at 77 K have been obtained after in-plane and out-of-plane pre-magnetization in a field of 1.4 T at 300 K. Randomly placed “magnetic volcanos” with a remanent magnetic moment of the order of 10−13 A m2 was observed. A decay of the remanent magnetization with a characteristic time of about 120 h was observed. It is suggested that the magnetic order is relatively long ranged, and that topological defects (vortices) lead to the observed out-of-plane field lines, and are responsible for the magnetic volcanos. Finally, it is hypothesized that a similar topology of field lines is responsible for superconductivity as observed in ceramic high-TC superconductors.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume234
Issue number3
Pages (from-to)499-504
ISSN0304-8853
DOIs
Publication statusPublished - 2001

Keywords

  • Langmuir–Blodgett films
  • Gadolinium
  • Scanning electron microscope
  • Magnetic image
  • X-ray diffraction
  • SQUID microscope

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