Health & Environmental Research Online (HERO)


Print Feedback Export to File
620648 
Journal Article 
High temperature superconductor micro-superconducting-quantum-interference-device magnetometer for magnetization measurement of a microscale magnet 
Takeda, K; Mori, H; Yamaguchi, A; Ishimoto, H; Nakamura, T; Kuriki, S; Hozumi, T; Ohkoshi S-i 
2008 
1 
Review of Scientific Instruments
ISSN: 0034-6748
EISSN: 1089-7623 
79 
3 
N.PAG 
We have developed a high temperature superconductor (HTS) micrometer-sized dc superconducting quantum interference device (SQUID) magnetometer for high field and high temperature operation. It was fabricated from YBa2Cu3O7-δ of 92 nm in thickness with photolithography techniques to have a hole of 4×9 μm2 and 2 μm wide grain boundary Josephson junctions. Combined with a three dimensional magnetic field coil system, the modulation patterns of critical current Ic were observed for three different field directions. They were successfully used to measure the magnetic properties of a molecular ferrimagnetic microcrystal (23×17×13 μm3), [Mn2(H2O)2(CH3COO)][W(CN)8]·2H2O. The magnetization curve was obtained in magnetic field up to 0.12 T between 30 and 70 K. This is the first to measure the anisotropy of hysteresis curve in the field above 0.1 T with an accuracy of 10-12 J T-1 (10-9 emu) with a HTS micro-SQUID magnetometer. [ABSTRACT FROM AUTHOR] Copyright of Review of Scientific Instruments is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
MAGNETOMETERS; SUPERCONDUCTING quantum interference devices; MAGNETIZATION; MAGNETIC measurements; MAGNETS