Mukhtar Fazeelat, Riaz Saira, Awan Attia, Rubab Fatima, Kayani Zohra N, Naseem Shahzad
Centre of Excellence in Solid State Physics, University of the Punjab Lahore Pakistan
Department of Physics, Lahore College for Women University Lahore Pakistan.
RSC Adv. 2019 Nov 25;9(65):38183-38194. doi: 10.1039/c9ra04455h. eCollection 2019 Nov 19.
Amongst other spinels, iron aluminium oxide (FeAlO) exhibits exceptional chemical and physical properties. However, magnetic properties of FeAlO still need further investigation. DC electrodeposition is used to deposit intermetallic FeAl thin films. Oxidation time is varied from 0 to 20 min with a constant metallic layer deposition time of 10 min. Electrodeposited iron aluminium oxide thin films are annealed in the presence of 500 Oe applied magnetic field (MF) at 300 °C in a vacuum. Mixed structural phases, FeAlO & χ-AlO, are observed at 5 min, 10 min and 15 min oxidation time. Whereas phase pure FeAlO is observed at 20 min oxidation time. Magnetization loops show ferromagnetic behavior of iron aluminum oxide thin films with anisotropic nature for in-plane and out-plane configurations. The law of approach to saturation magnetization (LAS) is used to calculate magnetocrystalline anisotropy. Phase purity at 20 min oxidation time results in high saturation magnetization of 29.5 emu cm with a low value anistopy constant of 1.28 × 10 erg cm. Easy axis of magnetization is shifted from perpendicular to parallel at an oxidation time of 20 min. Results show that oxidation of thin films for 20 min leads to structural and magnetization crossover from impure to phase pure FeAlO thin films with a high value of magnetization.
在其他尖晶石中，铁铝氧化物（FeAlO）具有优异的化学和物理性质。然而，FeAlO的磁性仍需进一步研究。采用直流电沉积法制备金属间化合物FeAl薄膜。在金属层沉积时间恒定为10分钟的情况下，氧化时间从0分钟变化到20分钟。将电沉积的铁铝氧化物薄膜在300℃的真空中，在500奥斯特的外加磁场（MF）存在下进行退火处理。在氧化时间为5分钟、10分钟和15分钟时观察到混合结构相FeAlO和χ - AlO。而在氧化时间为20分钟时观察到纯相的FeAlO。磁化回线显示出铁铝氧化物薄膜具有面内和面外配置的各向异性铁磁行为。采用饱和磁化趋近定律（LAS）来计算磁晶各向异性。氧化时间为20分钟时的相纯度导致高饱和磁化强度为29.5 emu/cm³，各向异性常数较低，为1.28×10 erg/cm³。在氧化时间为20分钟时，易磁化轴从垂直方向转变为平行方向。结果表明，薄膜氧化20分钟会导致结构和磁化从不纯的FeAlO薄膜转变为相纯的FeAlO薄膜，且具有高磁化强度。
