Tool Highlights

Inductive measurement using gradiometer coils around a moving sample
High speed: full magnetic m(H) hysteresis loops in just minutes
Uses a “SQUID” : superconducting interferometer
Samples: film, bulk, crystals, powder
8mm diameter sample space (4x4mm film typical)
electrical transport or biasing while measuring m
EverCool: pulse-tube cryocooler recondenses the helium that evaporates from the dewar

Status	UP
Issue Date and Description
Estimated Fix Date and Comment
Responding Staff	Neil

Quick Reference: Sample Requirements and Preparation

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Note that powders must be encapsulated in your lab before bringing them into the Spin Lab.

For MPMS magnetometry to 400 K:

for thin films perpendular to field: 5x5mm, 4x4mm; smaller is OK also but will need to be mounted to a larger non-magnetic substrate
thin films parallel to the field: 4x4mm up to 6x6mm
powders: typ. 1-10 mg can fit; please email ndilley@purdue.edu so I can provide you with parts to mount the powder in your lab before coming
crystals/bulk: smaller than 5mm on a side

For MPMS oven magnetometry up to 1000 K:

thin sample parallel to field: less than 5x5mm; recommend <0.5mm thick, otherwise we will need to use water-based cement to bond the sample to holder.
Other samples: we can discuss in training

General lab and MPMS-3 base system training...

General Spintronics Lab orientation
MPMS-3 instrument overview and gallery of data
MPMS-3 base system description (magnetic field, temperature, sample chamber)
- Accuracy of magnetic field (QD App Note 1500-011)
- how uniform is the B-field near zero field? zero field Hall profiles MPMS3.xlsx
SQUID measurement mode behaviors
To request training on either MPMS-3 or PPMS: download this questionnaire , fill it out and email it to ndilley@purdue.edu.

MPMS-3 measurement training...

References

Questionnaire - Spintronics Lab New User_yourname.docx

FURTHER READING

Sample size, position, and structure effects on magnetization measurements using second-order gradiometer pickup coils (Stamenov & Coey, RSI, 2006) : essential reading regarding artifacts seen in SQUID magnetometers due to non-dipole sample responses. Somewhat dated as it was done on a previous generation of MPMS, but principles still valid.

USER'S MANUALS and APP NOTES

MPMS 3 User's Manual.pdf

SEMINARS, NEWSLETTERS...

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