Physics, Mathematics & Computer Science

Event Title

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

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.

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Apr 11th, 1:00 PM Apr 11th, 3:00 PM

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.