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Memory and superposition in a superspin glass
D Peddis1,2, K N Trohidou3, M Vasilakaki3
1Istituto di Struttura della Materia-CNR, 00015, Monterotondo Scalo (RM), Italy. davide.peddis@unige.it.
Scientific Reports
|April 9, 2021
Summary
This study investigates the magnetic properties of manganese iron oxide nanoparticles, revealing superspin glass behavior similar to atomic spin glasses. Simulations highlight the interplay of core-surface and interparticle interactions influencing magnetic dynamics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Dense assemblies of ultrasmall magnetic nanoparticles exhibit complex magnetic phenomena.
- Understanding the non-equilibrium dynamics of superspin glass states is crucial for advanced magnetic materials.
Purpose of the Study:
- To investigate the non-equilibrium dynamics of the superspin glass state in ~2 nm MnFe2O4 nanoparticles.
- To compare experimental findings with Monte Carlo simulations incorporating particle morphology and interactions.
Main Methods:
- Magnetization, ac susceptibility, and Mössbauer spectroscopy measurements.
- Zero-field cooled (ZFC), thermoremanent (TRM), and isothermal remanent magnetization (IRM) protocols.
- Mesoscopic Monte Carlo simulations considering core/surface contributions and interparticle interactions.
Main Results:
- The nanoparticle assembly displays characteristic glassy magnetic features, akin to archetypal spin glasses.
- Dynamical properties of the low-temperature superspin glass phase were detailed.
- A superspin dimensionality crossover was observed, reflecting the non-atomic nature of the system.
Conclusions:
- The superspin glass state in MnFe2O4 nanoparticles exhibits similarities to atomic spin glasses but with unique dimensionality effects.
- Interplay between intraparticle (core/surface exchange) and interparticle (dipolar, exchange) interactions governs the magnetic behavior.
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