摘要：In this study, goethite microparticles (1.5-5 mu m in diameter) were used to investigate the abnormal exchange bias effect after zero-field cooling process. It was found that the superferromagnetic mechanism, which is of great relevance for the superparamagnetic hematite impurities, was the root cause of such exchange-bias effect. Most notably, one can readily control this effect by simply regulating the reaction time during synthesis. It is anticipated that this controllable and intriguing superferromagnetism-induced exchange-bias effect may not only open a new direction to re-examine the conventional exchange-bias mechanism but also has practical applications in magnetic tunnel junctions and high-density memories. (C) 2016 AIP Publishing LLC.
卷号：119
期号：7
是否译文：否