Absence of zero-field-cooled exchange bias effect in single crystallineLa2−xAxCoMnO6(A=Ca,Sr)compounds,Physical Review Materials

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Absence of zero-field-cooled exchange bias effect in single crystallineLa2−xAxCoMnO6(A=Ca,Sr)compounds
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-09-07 , DOI: 10.1103/physrevmaterials.5.094402
C. Macchiutti ₁ , J. R. Jesus ₁ , F. B. Carneiro ₁ , L. Bufaiçal ₂ , M. Ciomaga Hatnean ₃ , G. Balakrishnan ₃ , E. M. Bittar ₁

Affiliation

Magnetic properties of

A_{2} {B B}^{'} O_{6}

(

A = rare

or alkaline-earth ions;

B, B^{'} = transition − metal

ions) double perovskites are of great interest due to their potential spintronic applications. Particularly fascinating is the zero-field-cooled exchange bias effect observed for the hole-doped

{La}_{2 - x} A_{x} {CoMnO}_{6}

polycrystalline samples. In this paper we synthesize

{La}_{2} {CoMnO}_{6}, {La}_{1.5} {Ca}_{0.5} {CoMnO}_{6}

, and

{La}_{1.5} {Sr}_{0.5} {CoMnO}_{6}

single crystals by the floating zone method and study their magnetic behavior. The three materials are ferromagnetic. Surprisingly, we observe no zero or even conventional exchange bias effect for the Ca- and Sr-doped single crystals, in sharp contrast to polycrystalline samples. This absence indicates that the lack of grain boundaries and spin-glass-like behavior, not observed in our samples, might be key ingredients for the spontaneous exchange bias phenomena seen in polycrystalline samples.

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