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The two magnetic measurement methods of superconductors, SQUID method and Campbell method, are introduced briefly. Superconducting properties of MgB2 bulk samples are prepared by the high-pressure powder in tube (PIT) sintering method. The two measurement methods are employed to measure the critical current density of the sample. The Jc-B curves of the MgB2 samples are obtained with each method. The SQUID method can be used to measure the magnetic strength field up to 6 T and the material is in normal state, and the result is used to scale F(b) of the pinning through necessary calculation which is used to study the magnetic characteristic of the material. The critical current density (Jc) measured by the SQUID method is the average of the materials different parts. Jc is measured and estimated by the Campbell's method. The magnetic field is only to 0.4 T while the frequency of the AC parts magnetic field is varied from 37 Hz to 797 Hz. The critical current density obtained by Campbell's method is smaller than that obtained by the SQUID measurement, which is due to the existence of various faults and the decrease of the electrical connectivity.
[1] Gumbel A, Eckert J, Fucks G 2002 Appl. Phys. Lett. 80 2725
[2] Kosse A I, Prokhorov A Y, Khokhlov V A 2008 Supercond. Sci. Technol. 21 075015
[3] Teruo M 2007 Flux pinning in superconductors (Berlin: Springer-Verlag) p221
[4] Gallitto A A, Bonsignore G, Giunchi G, Vigni M L 2007 J. Supercond. Nov. Magn. 20 13
[5] Zheng D N, Campbell A M, Johnson J D, Cooper J R, Blunt F J 1994 Phys. Rev. B 49 1417
[6] Ni B, Liu Z Y, Yoshihiro M 2008 Phys. C 468 1443
[7] Huan Y, Luo H Q, Wang Z S 2008 Appl. Phys. Lett. 93 142506
[8] Campbell A M 1969 Phys. C: Solid State Phys. 2 1492
[9] Bean C P 1962 Phys. Rev. Lett. 8 250
[10] Lodon H 1963 Phys. Lett. 6 162
[11] Yasukoch K, Ogasawara T, Ushino N 1964 Phys. Soc. Jpn. 19 1649
[12] Jin H L, Jin X, Fang H C 1992 Chin. J. Low Temp. Phys. 14 12 (in Chinese) [吉和林, 金新, 范宏昌 1992 低温 14 12]
[13] Otabe E S, Ohtani N, Matsushita T, Ishikawa Y, Yoshizawa S 1994 Jpn. J. Appl. Phys. 33 996
[14] Wang R F, Zhao S P, Xu F Z 2002 Acta Phys. Sin. 51 889 (in Chinese) [王瑞峰, 赵士平, 徐凤枝 2002 51 889]
[15] Kimishima Y, Takami S, Okuda T 2007 Phys. C 463 281
[16] Kulich M, Kovac P, Weber H W 2011 Supercond. Sci. Technol. 24 065025
[17] He L, Hu X, Yin L 2009 Acta Phys. Sin. 58 417 (in Chinese) [贺丽, 胡翔, 尹澜 2009 58 417]
[18] Chu H F, Li J, Li S 2010 Acta Phys. Sin. 59 6585 (in Chinese) [储海峰, 李洁, 李绍, 黎松林 2010 59 6585]
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[1] Gumbel A, Eckert J, Fucks G 2002 Appl. Phys. Lett. 80 2725
[2] Kosse A I, Prokhorov A Y, Khokhlov V A 2008 Supercond. Sci. Technol. 21 075015
[3] Teruo M 2007 Flux pinning in superconductors (Berlin: Springer-Verlag) p221
[4] Gallitto A A, Bonsignore G, Giunchi G, Vigni M L 2007 J. Supercond. Nov. Magn. 20 13
[5] Zheng D N, Campbell A M, Johnson J D, Cooper J R, Blunt F J 1994 Phys. Rev. B 49 1417
[6] Ni B, Liu Z Y, Yoshihiro M 2008 Phys. C 468 1443
[7] Huan Y, Luo H Q, Wang Z S 2008 Appl. Phys. Lett. 93 142506
[8] Campbell A M 1969 Phys. C: Solid State Phys. 2 1492
[9] Bean C P 1962 Phys. Rev. Lett. 8 250
[10] Lodon H 1963 Phys. Lett. 6 162
[11] Yasukoch K, Ogasawara T, Ushino N 1964 Phys. Soc. Jpn. 19 1649
[12] Jin H L, Jin X, Fang H C 1992 Chin. J. Low Temp. Phys. 14 12 (in Chinese) [吉和林, 金新, 范宏昌 1992 低温 14 12]
[13] Otabe E S, Ohtani N, Matsushita T, Ishikawa Y, Yoshizawa S 1994 Jpn. J. Appl. Phys. 33 996
[14] Wang R F, Zhao S P, Xu F Z 2002 Acta Phys. Sin. 51 889 (in Chinese) [王瑞峰, 赵士平, 徐凤枝 2002 51 889]
[15] Kimishima Y, Takami S, Okuda T 2007 Phys. C 463 281
[16] Kulich M, Kovac P, Weber H W 2011 Supercond. Sci. Technol. 24 065025
[17] He L, Hu X, Yin L 2009 Acta Phys. Sin. 58 417 (in Chinese) [贺丽, 胡翔, 尹澜 2009 58 417]
[18] Chu H F, Li J, Li S 2010 Acta Phys. Sin. 59 6585 (in Chinese) [储海峰, 李洁, 李绍, 黎松林 2010 59 6585]
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