A SQUID-BASED AC SUSCEPTOMETER

被引：15

作者：

HIBBS, AD ^{[1
]}

SAGER, RE ^{[1
]}

KUMAR, S ^{[1
]}

MCARTHUR, JE ^{[1
]}

SINGSAAS, AL ^{[1
]}

JENSEN, KG ^{[1
]}

STEINDORF, MA ^{[1
]}

AUKERMAN, TA ^{[1
]}

SCHNEIDER, HM ^{[1
]}

机构：

[1] QUANTUM DESIGN INC,SAN DIEGO,CA 92121

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1994年 / 65卷 / 08期

关键词：

D O I：

10.1063/1.1144664

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have developed a high-resolution ac susceptometer that uses a rf superconducting quantum interference device to directly measure the flux coupled into a superconducting detection coil from a sample's changing magnetic moment in an applied ac field. The system operates in a frequency range from 0.01 to 1500 Hz and an applied ac field range of 0.1-400 mu T with a sensitivity of about 5X10(-12) A m(2) for magnetic moment measurement, and at a reduced sensitivity down to 0.001 Hz. The instrument is based on an existing de magnetometer system and uses that system's temperature control and dc superconducting magnet to allow operation over a temperature range from 2 to 400 K and in applied dc fields of +/-5.0 T. During a measurement all operations are controlled automatically by computer from a menu-driven software system, with user input required only on initiation of a measurement sequence. Both real and imaginary components of the ac susceptibility can be determined.

引用

页码：2644 / 2652

页数：9

共 15 条

[1]

[Anonymous], MAGN PROP MEAS SYST

[2] RADIO-FREQUENCY SUSCEPTIBILITY APPARATUS FOR MEASURING SMALL SUPERCONDUCTING SAMPLES [J].