A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
A Structural Optimization of Ferrite/YBCO Bilayers
Tekijät: Mika Malmivirta, Jaakko Jyrinki, Hannu Huhtinen, Alexey V. Pan, Sergey Rubanov, R. Jha, V. P. S. Awana, Petriina Paturi
Kustantaja: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Julkaisuvuosi: 2017
Journal: IEEE Transactions on Applied Superconductivity
Tietokannassa oleva lehden nimi: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Lehden akronyymi: IEEE T APPL SUPERCON
Artikkelin numero: ARTN 8000705
Vuosikerta: 27
Numero: 4
Sivujen määrä: 5
ISSN: 1051-8223
eISSN: 1558-2515
DOI: https://doi.org/10.1109/TASC.2016.2643445
Tiivistelmä
Magnetic particles can be used to take advantage of both defect and magnetic pinning in high-temperature superconductors. We combined layers of ferrite+cerium oxide with YBCO to see their effect both on the structure of the YBCO and on flux pinning. The deposition temperature of the ferrite greatly affects its structure and also the saturation magnetization. Combined with YBCO, the magnetic layer distorts the structure of YBCO, although, for example, the critical temperature remains rather unchanged. According to the structural results achieved here, the magnetic pinning layer is best positioned on the top of YBCO. This way, an improvement in J(c)(B) is seen in all the field range, and also, a clear improvement of the accommodation field was measured. However, it does not play a huge role whether the ferrite is CoFe2O4, NiFe2O4, or ZnFe2O4, all mixed with CeO2.
Magnetic particles can be used to take advantage of both defect and magnetic pinning in high-temperature superconductors. We combined layers of ferrite+cerium oxide with YBCO to see their effect both on the structure of the YBCO and on flux pinning. The deposition temperature of the ferrite greatly affects its structure and also the saturation magnetization. Combined with YBCO, the magnetic layer distorts the structure of YBCO, although, for example, the critical temperature remains rather unchanged. According to the structural results achieved here, the magnetic pinning layer is best positioned on the top of YBCO. This way, an improvement in J(c)(B) is seen in all the field range, and also, a clear improvement of the accommodation field was measured. However, it does not play a huge role whether the ferrite is CoFe2O4, NiFe2O4, or ZnFe2O4, all mixed with CeO2.
Turun yliopiston Tutkimustietojärjestelmän portaali