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Quantum Design MPMS-3 SQUID Magnetometer

Quantum Design MPMS-3 SQUID Magnetometer

iLab Name: MPMS-3
iLab Kiosk: BRK Characterization Core
FIC: Joerg Appenzeller
Owner: Neil Dilley
Location: BRK 1157A "Spintronics Lab" 
Staff page: MPMS - Staff (Restricted)

Tool Highlights

  • Most sensitive instrument for measuring bulk magnetic dipole moment m

  • Temperature : 1.8 – 400 K, oven : 300 – 1000 K

  • Magnetic field : +/- 7 tesla (70 kOe)

  • 10-8 emu (10-11 A-m2) sensitivity – equivalent to 1012 electron spins

  • AC susceptibility: f = 0.1 – 1000 Hz

 

  • 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

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

Standard Operating Procedure (SOP): MPMS-3

 

References

 

 

FURTHER READING

Essential reading for anyone starting their work in magnetism! B. D. Cullity and C. D. Graham, "Introduction to Magnetic Materials"

Reprint: Tutorial: A beginner’s guide to interpreting magnetic susceptibility data with the Curie-Weiss law 

Reprint: Sources of experimental errors in the observation of nanoscale magnetism (Garcia et al_2009)

Demagnetizing Factors of Rectangular prisms and ellipsoids.pdf

effective chi of paramagnetic powder_Bleaney_1941.pdf

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

MPMS-3 Evercool Option User's Manual.pdf

MPMS-3 Oven Option User's Manual.pdf

MPMS-3 AC Option User's Manual.pdf

SEMINARS, NEWSLETTERS...

Archive of Spin Lab Newsletters (originally emailed to spin lab user group)

spintronics lab lunch Oct 2017.pdf

Measuring Nanomagnetism at BNC Nov2017.pdf

SQUID - Quantum Design MPMS-3 - Internal Resources

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