Coexistence of superparamagnetism and superspin glass in non-stoichiometric Zn0.5Ca0.5Fe2O4 nanoferrite

Sudeep Tiwari,Ganesh Lal Data analysis,Himani Bhoi,Khushboo Punia,Sher Singh Meena,Sudhish Kumar

Journal of Magnetism and Magnetic Materials（2023）

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摘要

•Non-stoichiometric Zn0.5Ca0.5Fe2O4 ferrite nanoparticles exhibit dominant superparamagnetic character at 300 K.•Relaxation dynamics accompanied by ageing, memory and rejuvenation establishes superspin glass coexisting with superparamagnetism at low temperatures in ZCF NPs.•Dipolar inter-particle interactions, randomness in anisotropic & positional distributions along with exchange bias leads to superspin glass phase in ZCF NPs.

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关键词

Nano ferrite,dc & ac magnetic susceptibility,Superparamagnetism,Spin freezing,Super Spin glass,Exchange bias,Ageing,Memory effects

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