Construction of the magnetic phase diagram in small-volume HTS by an OFC magnetometer

S. G. Gevorgyan, Takanobu Kiss, Masayoshi Inoue, T. Ohyama, M. Takeo, T. Matsushita, K. Funaki

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We applied the OFC magnetometer for studies of vortex dynamics in small-volume HTS. The substitution of the solenoid coil by a flat one in a tunnel diode oscillator made the coil's filling factor maximal for flat specimens enabling to reach 1-3Å absolute and 10-6 relative changes of the penetration depth, λ, of RF magnetic field into HTS films. Our technique operates in high magnetic fields and measures linear changes of λ in 1mm range with high resolution. It is also an excellent Q-meter for detection of changes ∼10-9W of the absorption in HTS samples. Such abilities allow it to be applied in many fields of science and technology. In particular, detection of the magnetic field-dependent changes of the frequency and amplitude of a 23MHz oscillator enabled lines on the magnetic phase diagram for Y-Ba-Cu-O film to be constructed. It seems to have many similarities as compared to the diagrams defined for bulk HTS by the other methods. However, how close is the relation in fact, may be revealed after additional tests on the same quality specimens.

Original languageEnglish
Pages (from-to)3931-3934
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1 III
Publication statusPublished - Mar 1 2001
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: Sept 17 2000Sept 22 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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