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Scholars Day: April 10, 2013

Magnetic Susceptibility Measurements

In studying the magnetic properties of materials, one measures their susceptibility or response to an applied magnetic field. The applied field is generated by a solenoid (primary coil), where a sample is placed and a secondary coil is used to measure the mutual inductance between the coils as ‘modulated’ by a sample. For sensitivity purposes, another secondary coil is used for cancelling out the induced voltages in the two secondary coils, leaving that due to the sample, which is inside one secondary coil, while the other is empty. A set of coils, consisting of one primary and two secondary coils, has been constructed, using insolated 42.5 AWG Cu wire and a modified small lathe. That provides us with the capability of making these measurements. Sending current through the primary coil induces a magnetic field which in turn induces a voltage in the secondary coils. This induced voltage is recorded with a Lock-In-Detector and can be related to the sample’s magnetic and electric properties. These Measurements are taken while the sample’s temperature is swept between 1 and 4 K, in a liquid He bath and/or can be raised up to 80 K in vacuum, while the coils’ temperature is maintained at 4.2 K by the external He bath. This allows for magnetic and electronic phase transition studies.

Presenter: Kyle Conine (Undergraduate Student)
Topic: Physics
Location: Fireside Lounge, Seymour Union
Time: 9:30 am (Session I)
Please note that presentation times are approximate. If you are interested in attending sessions with multiple presentations, please be in the room at the start of the session.