Removing frozen field from SQUID magnetometer MvsH data

Click For Summary
SUMMARY

The discussion centers on the implications of a frozen field in SQUID magnetometer measurements, particularly in MvsH data analysis. The user observed that multiplying the applied field by a factor of 0.75 aligns the data with expected results, raising questions about the validity of this adjustment. Experts caution that a frozen field typically results in a simple offset rather than a multiplicative factor change, especially when the SQUID operates within a feedback loop. Conclusions emphasize the need for careful interpretation of data influenced by trapped flux.

PREREQUISITES
  • Understanding of SQUID magnetometer principles
  • Familiarity with MvsH data analysis techniques
  • Knowledge of feedback loop mechanisms in magnetometry
  • Basic concepts of magnetic field offsets and sensitivity
NEXT STEPS
  • Research the effects of frozen fields on SQUID magnetometer readings
  • Explore advanced SQUID feedback loop configurations
  • Learn about data correction techniques for magnetic measurements
  • Investigate the impact of trapped flux on magnetometer sensitivity
USEFUL FOR

Researchers and technicians working with SQUID magnetometers, physicists analyzing magnetic properties, and anyone involved in the calibration and interpretation of magnetometry data.

GPhys05032019
Messages
1
Reaction score
0
Hi,

I have measured a sample and realized there is a frozen field that remained in the SQUID magnetometer before the MvsH measurements were taken.

I am fairly new to using the SQUID, I have plotted the data and if I multiply the applied field by a factor of 0.75 the data matches what I expect.

Is this allowed? My thought process was that if there is an initial field while the SQUID is charging, this frozen field will also increase from the charging process, as the applied field does, so rather than it being an offset field, is it a factor change?

Thanks for any help
 
Physics news on Phys.org
That sounds a bit fishy.
A "frozen" field (that is, trapped flux) should for a "bare" SQUID just give you a field offset..
Now, you are probably using the SQUID in a feedback loop which makes things a bit more complicated; and I guess it is theoretically possible that the trapped flux would result in the magnetometer becoming less sensitive (i.e. a change by a constant factor). However, I would be very careful about drawing any conclusions from that data.
 
f95toli said:
That sounds a bit fishy.

I hope that pun was intended, because it was good! :)

Zz.
 

Similar threads

Graduate AC transport data query (using a PPMS system)
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Peter Morgan (QM ~ random field, non-commutative lossy records?)
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Getting the power spectral density from a plot
  • · Replies 3 ·
Replies
3
Views
2K
Plotting a Scatter Diagram from a Large Data Set
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Synchrotron Radiation: Charge Loss of Relativistic Particles in Magnetic Fields
  • · Replies 9 ·
Replies
9
Views
2K
Admissions Could I please get critique on my SOP? (Experimental Biophysics)
  • · Replies 8 ·
Replies
8
Views
917
Graduate 4 probe conductivity in discs (Smits)
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Why do conductivities and resistivities change with magnetic field strength?
  • · Replies 2 ·
Replies
2
Views
1K
Swarm Data: Earth's Magnetic Field is Weakening 10 times Faster
  • · Replies 3 ·
Replies
3
Views
9K
Graduate Does Adding or Removing an Electron Change a Helium-3 Atom to a Boson?
  • · Replies 14 ·
Replies
14
Views
2K