Fundamental characteristics of a magnetoresistive sensor using Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ ceramic superconducting films

Nojima, Hideo; Shintaku, H.; Nagata, M.; Kataoka, S.

doi:10.1109/16.123480

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…One of the important parameter of the material, which will be used as a magnetic sensor, is the magnetoresistance [19][20][21] which is the appearance of a resistance during the flow of a transport current under the magnetic field. External magnetic field penetrates the superconducting sample through these weak links, defects and large angle grain boundaries and impedes the current flow.…”

Section: Resultsmentioning

confidence: 99%

Properties of YBCO superconductors prepared by ammonium nitrate melt and solid-state reaction methods

Sözeri

Özkan

Ghazanfari

2007

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Properties of YBCO superconductors prepared by ammonium nitrate melt and solid-state reaction methods

Sözeri

Özkan

Ghazanfari

2007

Journal of Alloys and Compounds

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“…It is well known that HTSCs are extremely sensitive to very low magnetic fields: the electrical resistance of these materials shows a drastic increase when they are exposed to a magnetic field. This behaviour opens a new line of research for using some of these superconductors as highly sensitive magnetic sensors [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 82%

“…The magnetoresistivity in HTSCs at both weak and strong magnetic fields has been discussed by many researchers [1,2,5,[7][8][9][10][11]. A multi-connected Josephson junction model was proposed for the YBa 2 Cu 3 O 7−x (YBCO) HTSCs that have a high density of large-angle grain boundaries and defects [1].…”

Section: Introductionmentioning

confidence: 99%

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Thick films of superconducting YBCO as magnetic sensors

Albiss

2005

Supercond. Sci. Technol.

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Superconducting thick films of YBCO have been prepared successfully on MgO single-crystal substrate by a screen-printing method. A prototype magnetic field sensor has been made from these thick films and characterized using x-ray diffraction, scanning electron microscopy, and a magnetoresistance method. The microstructure of the YBCO thick film sensor was prepared in such a way so as to retain a small resistance R(B = 0) at liquid nitrogen temperature and at zero magnetic field. The R–T curves of the sensor revealed that the value of the resistance R(T) is highly sensitive to the relatively high applied magnetic fields in the temperature range from 75 to 85 K. The R–B curves were plotted at liquid nitrogen temperature. At relatively low applied magnetic fields (up to 100 G), the value of the normalized resistance was well fitted to the relation R(B)/R(B = 0) = 1+αB2, where α is a constant. However, at higher values of the applied magnetic fields, the normalized resistance exhibited an almost linear dependence with the applied field. The characteristics of the sensors showed considerable hysteresis at high ranges of magnetic field (from 100 to 500 G) with no significant hysteresis at low magnetic field (less than 100 G). The I–V curves at liquid nitrogen temperature were also measured after several thermal cycles for various values of applied magnetic fields. It was demonstrated that the I–V curves were independent on the number of thermal cycles and exhibited no significant change at relatively low currents and magnetic fields. That is, the I–V curves are reproducible under the above conditions. This suggests that a better performance of the sensor in the presence of relatively weak magnetic field is needed to get the ultimate sensitivity.

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Magnetotransport and structural properties of superconducting BPSCCO thick film on MgO substrate

Albiss

Gharaibeh

Kim

et al. 2008

Physica Status Solidi (a)

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Superconducting thick films of Bi1.8Pb0.4Sr2Ca2.2Cu3Ox (BPSCCO) have been prepared on MgO single crystal substrates by employing a screen‐printing method. Using this technique, we have prepared several samples utilizing different experimental conditions. Optimization of properties such as film thickness, microstructure, phase formation and annealing time was carefully monitored to obtain samples with transport properties that are quite sensitive to relatively low magnetic fields. The thick film was characterized using XRD, SEM, I–V characteristics and magnetoresistance methods. The microstructural analysis revealed that the samples were superconducting with the existence of a considerable number of weak links between the grains and at the grain boundaries. When the R–B curves were plotted at T = 77 K and at relatively low applied magnetic fields up to 100 G, the value of the normalized resistance was well fitted to the relation R (B)/R (B = 0) = 1 + αB2, where α is a constant. Samples were also measured after several thermal cycles to check the reproducibility at various experimental conditions. It was demonstrated that the I–V curves were independent of the number of thermal cycles and exhibited no significant change at relatively low currents and magnetic fields. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Fundamental characteristics of a magnetoresistive sensor using Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ ceramic superconducting films

Cited by 8 publications

References 19 publications

Properties of YBCO superconductors prepared by ammonium nitrate melt and solid-state reaction methods

Properties of YBCO superconductors prepared by ammonium nitrate melt and solid-state reaction methods

Thick films of superconducting YBCO as magnetic sensors

Magnetotransport and structural properties of superconducting BPSCCO thick film on MgO substrate

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