Enhanced magnetic coercivity and maximum energy product in double‐perovskite Y₂CoMnO₆single crystals

Abstract

We have investigated the influence of different annealing conditions on the magnetic properties on the single crystals of double‐perovskite Y2CoMnO6. The ferromagnetic moment along the c‐axis with the large magnetic coercivity and high squareness ratio was observed. Particularly, in the quenched specimen, the magnetic functionality has been greatly improved compared to that of the as‐grown crystal. The magnetic coercivity and maximum energy product have been increased by ∼120% and ∼50%, respectively, by comprising substantial disorders and defects. Our result renders an efficient route to improve the magnetic functionality in mixed‐valent magnets. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

Absence of zero-field-cooled exchange bias effect in single crystalline La2−xAx CoMnO6 Macchiutti1, Jesus2, Carneiro3 et al. 2021Phys. Rev. Materials

“…Conversely, this indicates that such frequency dependence of the ac intensity is most likely related to the onset of a second ferromagnetic transition extended over a broad temperature range as will be discussed in the next section. The magnetic irreversibility observed can be attributed to the domain-wall motion depinning process as previously seen in other double perovskite single crystals [29,30]. Table II summarizes the magnetic ordering transition temperatures for all studied materials.…”

Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y2Co2−xMnxO6 (x = 1.0–1.9)

“…The consecutive sweeping of H between +90 and −90 kOe gives rise to the remanent M ( M r = 2.58 µ B /f.u.) and abrupt increases in M via an avalanche‐like M reversal at the coercive field H c = 15.0 kOe …”