A Low Background Magneto-Optic Probe for High Sensitivity SQUID Susceptometer

Author

Shi Li ; Hurt, Daniel ; Toth, M. ; McElfresh, Benjamin ; Amann, Andreas ; Spagna, Stefano

Author_Institution

Quantum Design Inc., San Diego, CA, USA

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

4

Abstract

We present a magneto-optic probe designed for the studies of photoinduced magnetization in the highly sensitive SQUID susceptometer MPMS 3. The apparatus is used to conduct light from an external light source into the sealed sample chamber of the susceptometer and deliver the light stimuli right onto the sample, thus allowing uninterrupted measurement as functions of temperature and field, from 1.8 to 350 K, and in magnetic field up to 7 T. The fiber optic sample holder (FOSH) consists mostly of quartz components in order to minimize magnetic background. With background subtraction, the moment resolution of the FOSH can reach 10^-6 emu range even at full field. Future designs are underway to further reduce the magnetic background of the sample holder.

Keywords

SQUID magnetometers; fibre optic sensors; light sources; magnetic field measurement; magnetisation; magneto-optical sensors; quartz; sample holders; FOSH; MPMS; external light source; fiber optic sample holder; high sensitivity SQUID susceptometer; light stimuli; low background magnetooptic probe; magnetic background reduction; photoinduced magnetization; quartz component; sealed sample chamber; temperature 1.8 K to 350 K; Assembly; Magnetic semiconductors; Optical sensors; Probes; SQUIDs; Superconducting magnets; Temperature measurement; Magneto-optic (MO); Prussian blue; SQUID; photoinduced magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2327476

Filename

6971401