Trapped Field Profiles on Square GdBaCuO Bulks with Different Arrangement of Growth Sector Boundaries
Square GdBaCuO bulks with $45.2 \times 45.2$ mm 2 in the $ab$-plane and 15 mm in thickness along the $c$-axis with different arrangements of growth sector boundaries (GSBs) were magnetized by a field-cooled magnetization (FCM), a zero-field cooled magnetization (ZFC), and a pulsed-field magnetizatio...
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| Published in | Japanese Journal of Applied Physics Vol. 51; no. 9; pp. 093005 - 093005-5 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
The Japan Society of Applied Physics
01.09.2012
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| Online Access | Get full text |
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| Summary: | Square GdBaCuO bulks with $45.2 \times 45.2$ mm 2 in the $ab$-plane and 15 mm in thickness along the $c$-axis with different arrangements of growth sector boundaries (GSBs) were magnetized by a field-cooled magnetization (FCM), a zero-field cooled magnetization (ZFC), and a pulsed-field magnetization (PFM) and the trapped field profiles were measured. For the lower applied field in ZFC, the magnetic flux was trapped in the growth sector regions (GSRs), independent of the arrangement of GSBs. For the lower applied field in PFM, the magnetic flux was mainly trapped in the GSRs and an additional flux was also trapped at the sides in both bulks because of the complicated flux intrusion by the local heat generation. These bulks can trap a magnetic field as high as 7.5 T at 50 K by FCM without destruction. The magnetic flux intrusion and trapping for the square bulks were discussed. |
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| Bibliography: | Schematic view of two square-shaped bulks used in this study. In the Bulk(+), GSBs are positioned crosswise to the bulk, and in the Bulk($\times$), GSBs are positioned diagonally to the bulk. Experimental setup for (a) FCM and ZFC and (b) PFM around the bulk and the magnetizing coil. Time dependence of applied field $B_{\text{ex}}(t)$, local field $B_{\text{L}}{}^{\text{C}}(t)$, and temperature $T(t)$ on the Bulk(+) magnetized by FCM at 48 K. Temperature dependence of (a) trapped field $B_{z}$ and (b) maximum temperature rise $\Delta T_{\text{max}}$ on the Bulk(+) and Bulk($\times$) magnetized by FCM. Trapped field profiles $B_{z}{}^{\text{FCM}}$(4 mm) on the square-shaped bulk of (a) Bulk(+) and (b) Bulk($\times$) magnetized by FCM. Trapped field profiles $B_{z}{}^{\text{ZFC}}$(4 mm) of (a) Bulk(+) and (b) Bulk($\times$) after the ZFC of $B_{\text{ex}}=1$ T at 77 K. Trapped field $B_{z}{}^{\text{PFM}}$(1 mm) at the center of the bulk surface on the Bulk(+) and Bulk($\times$) as a function of applied pulsed field $B_{\text{ex}}$ at 40 and 77 K. Trapped field profiles $B_{z}{}^{\text{PFM}}$(1 mm) of the Bulk(+) and Bulk($\times$) at $T_{\text{s}}=40$ K for typical applied pulsed fields $B_{\text{ex}}$. |
| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.51.093005 |