Size dependence of the photoinduced magnetism and long-range ordering in Prussian blue analog nanoparticles of rubidium cobalt hexacyanoferrate

TL;DR

This study investigates how the size of rubidium cobalt hexacyanoferrate nanoparticles influences their photoinduced magnetism and magnetic ordering, revealing size-dependent magnetic behaviors at cryogenic temperatures.

Contribution

It demonstrates the size-dependent magnetic properties and long-range ordering in Prussian blue analog nanoparticles, a novel insight into their nanoscale magnetic behavior.

Findings

Magnetization increases upon light illumination at 5 K.

Long-range ferrimagnetic ordering temperatures vary with particle size.

Particles smaller than 10 nm exhibit Curie-like magnetic signals at 2 K.

Abstract

Nanoparticles of rubidium cobalt hexacyanoferrate (Rb$_j$Co$_k$[Fe(CN)$_6$]$_l \cdot n$H$_2$O) were synthesized using different concentrations of the polyvinylpyrrolidone (PVP) to produce four different batches of particles with characteristic diameters ranging from 3 to 13 nm. Upon illumination with white light at 5 K, the magnetization of these particles increases. The long-range ferrimagnetic ordering temperatures and the coercive fields evolve with nanoparticle size. At 2 K, particles with diameters less than approximately 10 nm provide a Curie-like magnetic signal.