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Section 7.6
Performing VSM Measurements in PPMS
High-Field (14T or Higher) Magnets
Chapter 7
Troubleshooting
Thus, Quantum Design strongly advises users to measure moment versus field in a stepwise
manner and perform measurements only at stable fields when measuring between –2 T to +2 T.
In the event that a user would like to sweep the field over the full range in a 14-T magnet, below
is a model for constructing a sequence file that helps minimize flux jumps.
SEQUENCE MODEL: M(H) FROM +14 TESLA TO –14 TESLA
VSM M(H) command: +14 tesla to +2 tesla, 100 Oe/sec, SWEEP mode, end mode = driven,
measure continuous
VSM M(H) command: +2 tesla to -2 tesla, 100 Oe/sec, DRIVEN AT EACH FIELD mode, end
mode = driven, Uniform spacing in field
VSM M(H) command: -2 tesla to -14 tesla, 100 Oe/sec, SWEEP mode, end mode = driven,
measure continuous
Set Field 0.0, end mode = persistent
7-10
VSM Option User’s Manual, 1096-100, Rev. B0
February 2011
Quantum Design