Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling

Shota Ishiwata; Mark Ainslie; Sunseng Pyon; Tsuyoshi Tamegai; Akiyasu Yamamoto

doi:10.1088/1361-6668/add8c5

Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling

Shota Ishiwata^*, Mark Ainslie, Sunseng Pyon, Tsuyoshi Tamegai, Akiyasu Yamamoto

^*Corresponding author for this work

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Abstract

Macroscopic current uniformity in a (Ba,K)Fe ₂As ₂ bulk sample produced by a process that demonstrated high trapped magnetic fields was evaluated through a comparative experimental and modeling approach. The bulk sample, with a well-defined square geometry, exhibited ideal roof-top patterns in magneto-optical (MO) images. Comparison of the magnetic moment, MO images, and finite element modeling results showed good agreement for the critical current density, suggesting that the supercurrent circulates uniformly throughout the sample on the order of MO resolution. These results highlight the importance of enhancing flux pinning strength and microstructural control at the submicron and grain boundary scale in iron-based superconducting polycrystalline materials.

Original language	English
Article number	065014
Journal	Superconductor Science and Technology
Volume	38
Issue number	6
DOIs	https://doi.org/10.1088/1361-6668/add8c5
Publication status	Published - 9 Jun 2025

Keywords

iron-based superconductor
magneto-optical imaging
FEM modeling
trapped field magnets
magnetization behavior

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1361-6668/add8c5

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title = "Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling",

abstract = "Macroscopic current uniformity in a (Ba,K)Fe 2As 2 bulk sample produced by a process that demonstrated high trapped magnetic fields was evaluated through a comparative experimental and modeling approach. The bulk sample, with a well-defined square geometry, exhibited ideal roof-top patterns in magneto-optical (MO) images. Comparison of the magnetic moment, MO images, and finite element modeling results showed good agreement for the critical current density, suggesting that the supercurrent circulates uniformly throughout the sample on the order of MO resolution. These results highlight the importance of enhancing flux pinning strength and microstructural control at the submicron and grain boundary scale in iron-based superconducting polycrystalline materials.",

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T1 - Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling

AU - Ishiwata, Shota

AU - Ainslie, Mark

AU - Pyon, Sunseng

AU - Tamegai, Tsuyoshi

AU - Yamamoto, Akiyasu

PY - 2025/6/9

Y1 - 2025/6/9

N2 - Macroscopic current uniformity in a (Ba,K)Fe 2As 2 bulk sample produced by a process that demonstrated high trapped magnetic fields was evaluated through a comparative experimental and modeling approach. The bulk sample, with a well-defined square geometry, exhibited ideal roof-top patterns in magneto-optical (MO) images. Comparison of the magnetic moment, MO images, and finite element modeling results showed good agreement for the critical current density, suggesting that the supercurrent circulates uniformly throughout the sample on the order of MO resolution. These results highlight the importance of enhancing flux pinning strength and microstructural control at the submicron and grain boundary scale in iron-based superconducting polycrystalline materials.

AB - Macroscopic current uniformity in a (Ba,K)Fe 2As 2 bulk sample produced by a process that demonstrated high trapped magnetic fields was evaluated through a comparative experimental and modeling approach. The bulk sample, with a well-defined square geometry, exhibited ideal roof-top patterns in magneto-optical (MO) images. Comparison of the magnetic moment, MO images, and finite element modeling results showed good agreement for the critical current density, suggesting that the supercurrent circulates uniformly throughout the sample on the order of MO resolution. These results highlight the importance of enhancing flux pinning strength and microstructural control at the submicron and grain boundary scale in iron-based superconducting polycrystalline materials.

KW - iron-based superconductor

KW - magneto-optical imaging

KW - FEM modeling

KW - trapped field magnets

KW - magnetization behavior

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DO - 10.1088/1361-6668/add8c5

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JO - Superconductor Science and Technology

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Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling

Abstract

Keywords

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