Abstract
Spin-glass transition in porous spheres BiFeO3
Highlights
It is known that the bismuth ferrite BiFeO3 (BFO) is one of few materials exhibiting multiferroic properties at room temperature
Both the power law and V–F dynamics prove that the frequency-dependent anomaly in χ(ω, T ) of spherical samples BFO is related to the transition to cluster spin glass state
As a result of the research, it was established: (i) the presence of a minimum in the temperature dependence of Hs(T ) at 100 K and the appearance of an exchange bias increasing with decreasing temperature; (ii) FC and ZFC magnetizations differ greatly below 250 – 300 K; (iii) a maximum is observed in the temperature dependence of the magnetization ZFC at a certain value of Tm, and with an increase in intensity H, the value of Tm decreases; (iv) a maximum near 120 K is observed on the temperature dependence of AC magnetic susceptibility, which shifts towards low temperatures when the frequency decreases
Summary
It is known that the bismuth ferrite BiFeO3 (BFO) is one of few materials exhibiting multiferroic properties at room temperature. Reduction to nanodimensionis an effective method of ferromagnetic order formation in BFO system due to an increase of the fraction of uncompensated spins and suppression of spiral order as a result of reduction of crystallite sizes [3, 4]. Both in thin BFO films and nanocrystals, magnetic switching can be induced by electric field [5, 6], which opens up prospects for practical application of BFO in magnetic sensors, spintronics and data storage devices [1]. Based on the results of field and temperature dependences of magnetization, magnetic AC susceptibility measurements we have established the existence of a phase transition to spin glass state in the examined materials
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