Interaction effects and transport properties of Pt capped Co nanoparticles

TL;DR

This study investigates how Pt capping influences the magnetic interactions and transport properties of Co nanoparticles, revealing a transition from demagnetizing to magnetizing interactions and a change in magnetoresistance behavior.

Contribution

It provides new insights into how Pt capping modulates magnetic interactions and transport phenomena in Co nanoparticles, highlighting a transition in their magnetic and resistive properties.

Findings

Transition from demagnetizing to magnetizing interactions with increased Pt capping

Crossover from giant magnetoresistance to anisotropic magnetoresistance

Magnetic and transport properties are significantly affected by Pt capping levels

Abstract

We studied the magnetic and transport properties of Co nanoparticles (NPs) being capped with varying amounts of Pt. Beside field and temperature dependent magnetization measurements we performed delta-M measurements to study the magnetic interactions between the Co NPs. We observe a transition from demagnetizing towards magnetizing interactions between the particles for an increasing amount of Pt capping. Resistivity measurements show a crossover from giant magnetoresistance towards anisotropic magnetoresistance.