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Superspin glass state in interacting assembly of Zn0.5Mn0.5Fe2O4 nanoparticles
Sudeep Tiwari1, Manisha Chalka2, Jiri Pechousek3
1Department of Physics, Mohanlal Sukhadia University, Faculty of Science, MB Campus, Durga Nursery Road, Udaipur, Udaipur, Rajasthan, 313002, INDIA.
Abstract:
This research presents an elaborate study on the superspin glass (SSG) state in interacting Zn0.5Mn0.5Fe2O4 nanoparticles (ZMF NPs). The superparamagnetic (SPM) character of ZMF NPs at 300 K was well established by comprehensive dc-magnetization, Langevin function fitting and 57Fe Mössbauer analysis. Magnetization data exhibited a transformation of ZMF NPs from SPM (Ms = 23 emu/g, TB = 118 K) to ferrimagnetic (FiM: Ms = 50 emu/g, Hc = 1056 Oe & Mr = 13 emu/g) upon cooling down to 5 K. Notably, at the same time, spin dynamics in ZMF NPs suggested SPM-SSG crossover at ~120 K. Existence of SSG phase in ZMF NPs is proven by the observation of memory effects via Zero-field cooled (ZFC), Field cooled (FC) and thermoremanent (TRM) protocols applied in the dc-magnetization measurements. In addition, isothermal remanent magnetization revealed Heisenberg-like spin dimensionality, while relaxation dynamics along with the ageing effect served as concluding evidence of low-temperature SSG phase in ZMF NPs. Low temperature ESR and Henkel plot measurements indicated that demagnetizing factors like dipolar interactions are responsible for the SSG type behavior of ZMF NPs at low temperatures. Overall, greenly synthesized ZMF NPs offer a fertile ground for investigating the complex nano-magnetism at low temperatures in nanoferrites (NFs).
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