AC Susceptibility and EPR Investigations of Superspin Dynamics in Manganese Oxide Nanoparticles
We have investigated the superspin dynamics of 5 nm and 10 nm mixed state Mn3O4 nanoparticles utilizing ac-susceptibility and electron paramagnetic resonance measurements. The out of phase component of the ac-susceptibility measurements show a magnetic anomaly below (T < TN) the paramagnetic to ferrimagnetic transition (TN ≅ 41K) of the selected material. EPR spectra show markedly different magnetic signatures which corroborate the particle size dependence as shown in the low-temp ac-susceptibility scans, both of which depict superparamagnetic behavior.
Koirala, Mahesh, "AC Susceptibility and EPR Investigations of Superspin Dynamics in Manganese Oxide Nanoparticles" (2017). ETD Collection for University of Texas, El Paso. AAI10615918.