Size-Induced Exchange Bias Effect and Griffiths Phase in Electron Doped Sm0.09Ca0.91MnO3 manganites

TL;DR

This study investigates how reducing the size of electron-doped Sm0.09Ca0.91MnO3 manganites influences exchange bias effects and the Griffiths phase, revealing size-dependent magnetic properties and phase separation phenomena.

Contribution

It demonstrates the size-induced enhancement of exchange bias and Griffiths phase in nanostructured Sm0.09Ca0.91MnO3 manganites, linking size reduction to magnetic phase modifications.

Findings

Exchange bias fields depend on cooling magnetic field strength.

Griffiths phase exists between TC and TG temperatures.

Size reduction enhances exchange bias and Griffiths phase effects.

Abstract

We report here the magnetic properties of electron-doped Sm1-xCaxMnO3 manganites with the doping level of x=0.91. Exchange bias effect has been observed in Sm0.09Ca0.91MnO3 nanomanagnites system and can be tuned by the strength of cooling magnetic field (Hcool). The values of exchange bias parameter i.e. exchange bias fields (HE), coercivity (HC), remanence asymmetry (ME) and magnetic coercivity (MC) are found to strongly depend on Hcool. The larger effective magnetic moments and deviation of inverse susceptibility (\c{hi}-1) from Curie-Weiss law indicate the possible existence of Griffiths phase (GP). A rigorous measurement of linear and nonlinear ac and dc magnetic susceptibility in nanomanganites proves the existence of Griffiths phase (GP) in the temperature range TC<T<TG (Griffiths temperature). The effect of size reduction on exchange bias effect and GP is addressed here. The enhancement of exchange bias effect and GP has been argued to be due to the modification of the phase separated state on size reduction.