Mixed Brownian alignment and Néel rotations in superparamagnetic iron oxide nanoparticle suspensions driven by an ac field

Please use this identifier to cite or link to this item: http://digitalrepository.fccollege.edu.pk/handle/123456789/104

Title:	Mixed Brownian alignment and Néel rotations in superparamagnetic iron oxide nanoparticle suspensions driven by an ac field
Authors:	Shah, Dr. Saqlain Abbas Daniel, B. Ravees Ferguson, Matthew R Weaver, John B Krishnan, Kannan M
Keywords:	Physics
Issue Date:	24-Sep-2015
Publisher:	American Physical Society
Series/Report no.:	Vol:92(9);094438
Description:	Superparamagnetic iron oxide nanoparticles with highly nonlinear magnetic behavior are attractive for biomedical applications like magnetic particle imaging and magnetic fluid hyperthermia. Such particles display interesting magnetic properties in alternating magnetic fields and here we document experiments that show differences between the magnetization dynamics of certain particles in frozen and melted states. This effect goes beyond the small temperature difference (Δ T∼ 20∘ C) and we show the dynamics to be a mixture of Brownian alignment of the particles and Néel rotation of their moments occurring in liquid particle suspensions. These phenomena can be modeled in a stochastic differential equation approach by postulating log-normal distributions and partial Brownian alignment of an effective anisotropy axis.
URI:	http://localhost:8080/xmlui/handle/123456789/104
Appears in Collections:	Physics Department

Files in This Item:

File	Description	Size	Format
Research Document.pdf Restricted Access		86.41 kB	Adobe PDF	View/Open Request a copy

DSpace JSPUI