The exchange bias effect (H_EB) has been studied in this work. The coaxial electrospinning technology is used to prepare nanofibers (NFs) with core–shell structure. The magnetic properties and H_EB of CoFe₂O₄@NiO NFs are studied at different annealing temperatures (400, 450, 500, 550 and 600 °C). Its morphology and magnetic properties have been measured by XRD, SEM, HRTEM and VSM, respectively. The H_c and H_EB increase first and then decrease, reaching the maximum value at the annealing temperature of 550 °C. M_s is 42.7 emu/g and H_c is 958Oe at 300 K. M_s is 47.2 emu/g, H_c is 12653 Oe, and H_EB is 758 Oe at 5 K. With the increase in annealing temperature, the coupling effect at the interface is enhanced due to the change of distance between core and shell. The results in this work provide significant application in spintronic and magnetic recording devices.

在这项工作中已经研究了交换偏向效应（H _EB）。同轴电纺技术用于制备具有核壳结构的纳米纤维（NFs）。研究了在不同退火温度（400、450、500、550和600°C）下CoFe ₂ O ₄ @NiO NFs的磁性和H _EB。分别通过XRD，SEM，HRTEM和VSM测量了其形貌和磁性。H _c和H _EB先升高，然后降低，在550°C的退火温度下达到最大值。在300 K下，M _s为42.7 emu / g，H _c为958Oe.M _s为47.2 emu / g，H _c在5 K时为12653 Oe，H _EB为758 Oe。随着退火温度的升高，由于核与壳之间的距离变化，界面处的耦合效应增强。这项工作的结果在自旋电子和磁记录设备中提供了重要的应用。