Physics, Mathematics & Computer Science
Analyzing Nanoparticle Magnetization with a Novel Pulsed Magnetic Field Faraday Rotation Experimental Setup
Document Type
Oral Presentation
Location
Indianapolis, IN
Subject Area
Physics, Mathematics & Computer Science
Start Date
11-4-2014 1:00 PM
End Date
11-4-2014 3:00 PM
Sponsor
Maarij Syed (Rose-Hulman Institute of Technology)
Description
Faraday rotation (FR) is a valuable optical technique to probe the magnetic properties such as saturation magnetization and the wavelength dependent Verdet constant of liquid, solid, and colloidal samples. FR refers to the rotation of the polarization of a light beam passing through a substance inside of a magnetic field resulting in magnetically induced birefringence. While FR measurements have commonly been made with AC and DC magnetic fields, these measurements correspond either to time averaged magnetization information for AC fields or to a few discrete values of magnetization information for DC fields. To overcome some of these difficulties, pulsed field FR measurements capture a snapshot of a sample's magnetization. An experimental setup involving a pulsed setup has been created which has the capacity to create pulse magnetic fields of varying peak height, rise time, and total pulse duration. To accomplish pulse shaping, the resistance and the inductance of the inductive load for the setup can be varied. In addition to producing different pulse shapes, different kinds of inductive loads such as a solenoid coil and a Helmholtz coil have unique benefits as measurement tools. Finally, nanoparticle results will be shared highlighting the complementary nature of pulsed and AC FR measurements along with the benefits of different pulse characteristics to the pulsed FR technique.
Analyzing Nanoparticle Magnetization with a Novel Pulsed Magnetic Field Faraday Rotation Experimental Setup
Indianapolis, IN
Faraday rotation (FR) is a valuable optical technique to probe the magnetic properties such as saturation magnetization and the wavelength dependent Verdet constant of liquid, solid, and colloidal samples. FR refers to the rotation of the polarization of a light beam passing through a substance inside of a magnetic field resulting in magnetically induced birefringence. While FR measurements have commonly been made with AC and DC magnetic fields, these measurements correspond either to time averaged magnetization information for AC fields or to a few discrete values of magnetization information for DC fields. To overcome some of these difficulties, pulsed field FR measurements capture a snapshot of a sample's magnetization. An experimental setup involving a pulsed setup has been created which has the capacity to create pulse magnetic fields of varying peak height, rise time, and total pulse duration. To accomplish pulse shaping, the resistance and the inductance of the inductive load for the setup can be varied. In addition to producing different pulse shapes, different kinds of inductive loads such as a solenoid coil and a Helmholtz coil have unique benefits as measurement tools. Finally, nanoparticle results will be shared highlighting the complementary nature of pulsed and AC FR measurements along with the benefits of different pulse characteristics to the pulsed FR technique.