| dc.contributor.author | KITAGUCHI, HITOSHI | |
| dc.contributor.author | DOI, TOSHIYA | |
| dc.contributor.author | KOBAYASHI, YUKI | |
| dc.contributor.author | MATSUMOTO, AKIYOSHI | |
| dc.contributor.author | SOSIATI, HARINI | |
| dc.contributor.author | HATA, SATOSHI | |
| dc.contributor.author | FUKUTOMI, MASAO | |
| dc.contributor.author | KUMAKURA, HIROAKI | |
| dc.date.accessioned | 2017-08-10T11:27:31Z | |
| dc.date.available | 2017-08-10T11:27:31Z | |
| dc.date.issued | 2005-06 | |
| dc.identifier.citation | 21 | en_US |
| dc.identifier.other | 10.1109/TASC.2005.848866 | |
| dc.identifier.uri | http://repository.umy.ac.id/handle/123456789/12706 | |
| dc.description.abstract | Magnesium diboride, MgB2, thin films are fabricated through two different kinds of process. One is an in-situ process by using electron beam deposition and the other is an ex-situ process by using the combination of pulsed laser deposition and heat treatment. The critical current density, Jc is investigated as a function of external magnetic field in the range of 0–7 T and/or temperatures ranging from 4.2 K to the critical temperature by using dc 4-probe transport method. The in-situ processed film shows very high
Jc, e.g., 7.1 x 102, 1.2 x 106, and 1.4 x 105 A/cm2 in 0, 4, and 7 T (perpendicular fields), respectively. Angular dependence of Jc is much different between the two kinds of films. Jc-angle (magnetic field) curves of the in-situ processed film show two peaks; one is around the field perpendicular to the film surface and the other is around the parallel field. On the contrary, the curves of the ex-situ processed
film have only one peak around the parallel field. Microstructure analyses show that the in-situ film has columnar grains aligned perpendicular to the film surface and that the ex-situ one has granular grains with random orientations. These results indicate that the grain boundaries between columnar grains act as effective pinning centers and enhance Jc in the perpendicular fields. | en_US |
| dc.description.sponsorship | Research Promotion Bureau, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, under contract 16-556. TEM analyses were carried in “Nanotechnology Support Project” of the MEXT, Japan | en_US |
| dc.publisher | IEEE | en_US |
| dc.subject | Critical current densities ( ), irreversibility fields, MgB2 , pinning, thin films | en_US |
| dc.subject | Research Subject Categories::TECHNOLOGY | en_US |
| dc.title | PROPERTIES OF MGB FILMS WITH VERY HIGH TRANSPORT CRITICAL CURRENT DENSITIES | en_US |
| dc.type | Article | en_US |
