The possibility of detection of small absorption in HTS thin films by means of the highly sensitive OFC magnetometer

S. G. Gevorgyan, Takanobu Kiss, H. G. Shirinyan, A. A. Movsisyan, T. Ohyama, Masayoshi Inoue, T. Matsushita, M. Takeo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have essentially widened the capabilities of the open-flat coil-based tunnel diode oscillator technique (OFC magnetometer) for simultaneous tests of magnetic penetration depth, λ, of rf magnetic field and for detection of small changes of absorption inside the thin plate-like HTS materials. The updated method is based on simultaneous detection of the inductance and Q-factor value changes of the unusual flat (single-layer open-faced geometry) coil-based MHz-range resonator, which finally leads to the resonant frequency and amplitude changes of the oscillator. Our technique enables detecting the changes ∼10-12 H of HTS film's magnetic inductance (the changes ∼1-3 Å of λ). It detects also the changes ∼10-9 W of testing field's power absorption by the film, originated from the variation of its internal flux distribution (due to vortex flow during the suppression of superconductivity by external magnetic field). It can operate in wide ranges of temperature and magnetic field and measure in wide dynamic ranges of the testing parameters. We present the test results of the 0.2 μm thick and a few millimeter in diameter disk- and ring-shaped YBaCuO films illustrating wide capabilities of the updated OFC magnetometer to study weakly expressed peculiarities of superconductive state related, in particular, with the insignificantly small absorption at vortex motion.

Original languageEnglish
Pages (from-to)113-118
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume363
Issue number2
DOIs
Publication statusPublished - Nov 1 2001

Fingerprint

Magnetometers
magnetometers
Magnetic fields
Thin films
Inductance
Tunnel diode oscillators
Vortex flow
thin films
inductance
Magnetic films
coils
oscillators
magnetic fields
Testing
vortices
Superconductivity
tunnel diodes
Resonators
thin plates
Natural frequencies

All Science Journal Classification (ASJC) codes

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

Cite this

The possibility of detection of small absorption in HTS thin films by means of the highly sensitive OFC magnetometer. / Gevorgyan, S. G.; Kiss, Takanobu; Shirinyan, H. G.; Movsisyan, A. A.; Ohyama, T.; Inoue, Masayoshi; Matsushita, T.; Takeo, M.

In: Physica C: Superconductivity and its applications, Vol. 363, No. 2, 01.11.2001, p. 113-118.

Research output: Contribution to journalArticle

Gevorgyan, S. G. ; Kiss, Takanobu ; Shirinyan, H. G. ; Movsisyan, A. A. ; Ohyama, T. ; Inoue, Masayoshi ; Matsushita, T. ; Takeo, M. / The possibility of detection of small absorption in HTS thin films by means of the highly sensitive OFC magnetometer. In: Physica C: Superconductivity and its applications. 2001 ; Vol. 363, No. 2. pp. 113-118.
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