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Section 3.3
Measuring the Sample
3.3
Chapter 3
Sample Measurement
Measuring the Sample
The procedures in this section explain how you use the standard sample transport to perform a manual,
or immediate, DC sample measurement. Section 5.4 explains how you automate DC measurements
by running a sequence. The Magnetic Property Measurement System: AC Option User’s Manual
explains how you perform an AC sample measurement. The Magnetic Property Measurement System:
Reciprocating Sample Option User’s Manual explains how you perform an RSO sample measurement
and how you use the RSO sample transport.
3.3.1
Attach the Sample
The type, size, and geometry of a sample determine the method you use to attach it to the sample
rod. This section explains how you use a clear plastic drinking straw to attach a sample. The straw
has minimal magnetic susceptibility and is thus a useful means of attaching a sample. The MPMS
Hardware Reference Manual describes other techniques you can use to attach samples.
Complete the following steps to attach the sample to the sample rod:
3-2
1.
Cut off a small section of a clear plastic drinking straw. The section must be small enough to fit
lengthwise inside the straw.
2.
Weigh and measure the sample. After you insert the sample into the sample chamber, you can
use the SamplehDescription option to define the sample’s mass, in milligrams, and its diameter
and length, in millimeters.
3.
Use phenolic tweezers to place the sample inside the small straw segment.
4.
Hold the straw segment so that its two
open ends are vertical.
5.
Place the straw segment inside the drinking straw, and move the segment until it
is in approximately the middle of the
length of the straw. Verify that the walls
of the straw obstruct the open ends of the
segment. Refer to figure 3-1.
6.
Wrap a sufficient amount of tape around
the brass-colored end of the sample rod so
that the drinking straw will fit snugly over
the rod. Quantum Design recommends
using Kapton tape.
Figure 3-1. Correctly Positioned Sample
7.
Place the end of the drinking straw over the tape on the sample rod, and then use additional tape
to securely attach the straw to the rod.
8.
Place a small piece of tape over the exposed end of the drinking straw. This extra piece of tape
prevents a loose sample from falling into the sample chamber.
9.
Move the slide seal plug up and down part of the sample rod to verify that the rod is well
lubricated. If the plug does not move easily, apply a small amount of Apiezon H Grease to the
rod. Run your fingers along the length of the rod to ensure a light, even coating of grease.
MPMS MultiVu Application User’s Manual
Quantum Design