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Post by yingzhen on Nov 14, 2021 21:13:46 GMT -5
Dear Engineer, We want to measure the Magnetic relaxation in Time dependent measurements. I find to Moment v.s Time in our profile, when I set the all factor inside the profile cannot work to take the data. It stay a long time in the stage - " wait for the data point ". Our measurement hope like this: we applied a field (for example : 18 kOe) to the sample, until field stable, we close the field to 0 Oe, and at the same time recede to data point. Same with following picture from paper. Could you give me some suggestion how to write the profile to take the data?  Our VSM is 7400 Series VSM (model 7407) All the best for you, Alice |
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Post by Lake Shore Cosmin on Nov 23, 2021 14:47:13 GMT -5
Dear Alice,
Please contact us via support@lakeshore.com for a faster response.
The m vs. time experiment, like all the 7400 VSM experiments, has a few seconds delay before taking first data point. Since you are looking at fast evolving material magnetization you could try to edit the time domains so the points are acquired faster, just like you did for temperature domains in the past OR manually ramp the field while recording m vs. time. The experiment should be configured with minimum time constant and averaging and should be started before ramping down the field. For field ramping, you first need to figure out what current you need for 18kOe and what current will then bring the field down to 0 Oe. Once you know these 2 current settings, you are ready to start recording m vs. time and then you manually ramp the field. The EM Power Supply has to be set for local or internal control in order for you to be able to set a current from front panel. Because it is quite a fast ramp, the VSM may detect the change in field as "fake" moment so I am not sure if it will work for you.
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