The Effect of Magnetic Nanoparticles on Inductances for SFQ Device Application

Author

Akaike, Hiroyuki ; Shigehara, Keisuke ; Okumura, Takayuki ; Yano, Shun ; Fujimaki, Akira

Author_Institution

Dept. of Quantum Eng., Nagoya Univ., Nagoya, Japan

Volume

21

Issue

3

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

131

Lastpage

134

Abstract

The use of magnetic material can improve the performance of a single-flux-quantum device by inducing high self-or mutual inductance, which can reduce the size or increase the sensitivity of the device. We used magnetic nanoparticles as the magnetic material and adopted photoresist patterns with Fe₃O₄ nanoparticles as a means of inserting nanoparticles into a device. The effect of the nanoparticles was investigated for SQUIDs with photoresist patterns. Analytical estimation of the effect indicated a variation in SQUID inductance of less than 1%, which is in agreement with the experimental results in the absence of external magnetic fields. On the other hand, when external DC magnetic fields were applied, a slight increase in inductance was observed for several SQUIDs.

Keywords

SQUIDs; magnetic fields; nanoparticles; photoresists; superconducting magnets; superconducting materials; SQUIDs; device sensitivity; external DC magnetic field; magnetic material; magnetic nanoparticle; mutual inductance; photoresist pattern; self-inductance; single flux quantum device application; Inductance; Magnetic anisotropy; Nanoparticles; Resists; SQUIDs; Saturation magnetization; Superconducting magnets; $hbox{Fe}_{3}hbox{O}_{4}$; SQUIDs; magnetic effects; nanoparticles;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2093552

Filename

5675701