TY - JOUR
T1 - Characterization of Spatial Distribution of Local Critical Current Density in a Co-Doped BaFe2As2Film Based on Magnetic Microscopy
AU - Wu, Zeyu
AU - Higashikawa, Kohei
AU - Imamura, Kazutaka
AU - Xu, Zhongtang
AU - Ma, Yanwei
AU - Kiss, Takanobu
N1 - Funding Information:
Manuscript received December 1, 2020; revised December 31, 2020 and January 24, 2021; accepted February 12, 2021. Date of publication February 17, 2021; date of current version March 26, 2021. This work was supported by Japan Society for the Promotion of Science (JSPS) and Chinese Academy of Sciences (CAS) under the Japan – China Research Cooperative Program. The work of Zhongtang Xu and Yanwei Ma was supported by the International Partnership Program of the CAS under Grant GJHZ1175. (Corresponding author: Zeyu Wu.) Zeyu Wu, Kohei Higashikawa, Kazutaka Imamura, and Takanobu Kiss are with the Department of Electrical Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan (e-mail: z.wu@super.ees.kyushu-u.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - We have investigated spatial distribution of local critical current density (Jc) in a Co-doped BaFe2As2 (Ba122:Co) film based on scanning Hall-probe microscopy (SHPM). In-plane Jc distribution was derived from the magnetic field distribution. Thanks to the high-resolution characterization, local obstacle can be detected clearly, as well as a local spot with extremely high Jc over 7 MA/cm2, which is among the highest value at remanent state reported for this series of films so far. The SHPM allows us to separate the influence of current blocking obstacles and intrinsic flux pinning properties on Jc. Validity of the Jc analysis was checked by a magnetization measurement based on a SQUID magnetometer. Moreover, we investigated the Jc distributions at different temperatures by SHPM and studied their probability distribution functions (PDFs). PDFs are found to be scaled by a Weibull function with the same shape parameter, while Jcs are decreasing with higher temperature. These results indicate that the intrinsic in-plane pinning is controlled by the same mechanism.
AB - We have investigated spatial distribution of local critical current density (Jc) in a Co-doped BaFe2As2 (Ba122:Co) film based on scanning Hall-probe microscopy (SHPM). In-plane Jc distribution was derived from the magnetic field distribution. Thanks to the high-resolution characterization, local obstacle can be detected clearly, as well as a local spot with extremely high Jc over 7 MA/cm2, which is among the highest value at remanent state reported for this series of films so far. The SHPM allows us to separate the influence of current blocking obstacles and intrinsic flux pinning properties on Jc. Validity of the Jc analysis was checked by a magnetization measurement based on a SQUID magnetometer. Moreover, we investigated the Jc distributions at different temperatures by SHPM and studied their probability distribution functions (PDFs). PDFs are found to be scaled by a Weibull function with the same shape parameter, while Jcs are decreasing with higher temperature. These results indicate that the intrinsic in-plane pinning is controlled by the same mechanism.
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U2 - 10.1109/TASC.2021.3059988
DO - 10.1109/TASC.2021.3059988
M3 - Article
AN - SCOPUS:85100933956
SN - 1051-8223
VL - 31
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 9356125
ER -