Nanoparticle Magnetism: Superspin Glasses
Artikel i vetenskaplig tidskrift, 2019

This article discusses the magnetic super-phase, which occurs in strongly interacting magnetic nanoparticle systems. The phase is a nanoparticle analog to the atomic magnetic spin glass phase and is therefore called a superspin glass. Experimental data for a dense maghemite nanoparticle compact is presented and it is shown that this system forms a superspin glass phase by undergoing a second order phase transition. Below its transition temperature the system exhibits non-equilibrium dynamical properties similar to those of atomic spin glasses. It was shown that it is possible to tune the transition temperature by choosing the size of the particles used to make the compact. By mixing two sizes of particles (9 and 11.5 nm) and making compacts of different relative concentration of these sizes it was shown that it is the average dipolar interaction which determines the transition temperature.

Superspin Glasses

Magnetism

Magnetic Nanoparticles

Maghemite

Författare

Mikael Andersson

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi 2

Journal of Nanoscience and Nanotechnology

1533-4880 (ISSN)

Vol. 19 8 4903-4910

Ämneskategorier

Fysikalisk kemi

Materialkemi

Den kondenserade materiens fysik

DOI

10.1166/jnn.2019.16798

PubMed

30913801

Mer information

Senast uppdaterat

2019-08-20