DC magnetization of titania supported on reduced graphene oxide flakes

Niko Guskos,Spiros Glenis,Aleksander Guskos,Agnieszka Wanag,Grzegorz Zolnierkiewicz,Urszula Narkiewicz,Konstantinos Aidinis,Antoni W Morawski,Ewelina Kusiak-Nejman

doi:10.1515/rams-2021-0059

Abstract

Abstract DC magnetization of a series of titania nanocomposites modified with reduced graphene oxide (rGO) has been investigated. Hysteresis loops observed at room temperature disappeared at low temperatures. At a temperature of about 100 K, a phase transition to the superferromagnetic order state was observed, probably due to the linear expansion and self-reorientation of the magnetic moments. Processes associated with magnetic moment reorientation can cause a hysteresis loop to disappear at low temperatures as well as superferromagnetic ordering. It was suggested that the isolated nanoparticle in the nanopore could be used to create a “compass” at a nanometer-sized level that would be many times more sensitive than the conventional one. Measurements of the zero-field cooling and field cooling modes do not exclude the possibility of the coexistence of a superparamagnetic state.

Highlights

DC magnetization of a series of titania nanocomposites modified with reduced graphene oxide has been investigated
The samples under study were registered in an external different magnetic field H in zero-field cooling (ZFC) and field cooling (FC) modes
By applying magnetic nanoparticles in a small concentration, we can obtain a superparamagnetic state and there is a strong dependence of magnetic susceptibility in ZFC and FC modes [15,16]

Summary

Introduction

Abstract: DC magnetization of a series of titania nanocomposites modified with reduced graphene oxide (rGO) has been investigated. Hysteresis loops observed at room temperature disappeared at low temperatures. At a temperature of about 100 K, a phase transition to the superferromagnetic order state was observed, probably due to the linear expansion and self-reorientation of the magnetic moments. Processes associated with magnetic moment reorientation can cause a hysteresis loop to disappear at low temperatures as well as superferromagnetic ordering. It was suggested that the isolated nanoparticle in the nanopore could be used to create a “compass” at a nanometer-sized level that would be many times more sensitive than the conventional one. Measurements of the zero-field cooling and field cooling modes do not exclude the possibility of the coexistence of a superparamagnetic state

Objectives

Results

Conclusion