Paper 13115-6
Paper 13115-6
Specific heat measurements revealing size-dependent magnetic phase transitions in ZnO nanowires
18 August 2024 • 11:50 AM - 12:10 PM PDT
Abstract
The effect of size on transitions between defect-induced magnetic phases in ZnO nanowires is investigated in a temperature range from 1.8 K to 300 K using calorimetric measurements of specific heat. The obtained results demonstrated interesting magnetic phenomena in unusual magnetic nanomaterials. At low temperatures, we observed isolated magnetic ions in nanowires of diameters 45-50 nm, and ferromagnetic phases in nanowires of diameters 85-100 nm. However, at higher temperatures, we observed multiple transitions between superparamagnetic phases in the thinner nanowires and multiple transitions between spin-glass phases in the thicker nanowires.
Presenter
American Univ. of Beirut (Lebanon)
Michel Kazan received his PhD in condensed matter physics from the University of Montpellier II in 2006. He joined the physics department at AUB as an assistant professor in September 2010 and was promoted to associate professor in June 2015. He has worked as a postdoctoral researcher in many institutes and was appointed as an assistant professor at the University of Technology of Troyes in 2009. During his service at AUB, he worked for short periods as a visiting professor at Ecole Centrale-Paris and Université de Technologie de Troyes.