Moya Carlos, Iglesias-Freire Óscar, Pérez Nicolás, Batlle Xavier, Labarta Amilcar, Asenjo Agustina
Departament de Física Fonamental, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Barcelona, 08028, Spain.
Nanoscale. 2015 May 7;7(17):8110-4. doi: 10.1039/c5nr00592b.
This work reports on the experimental characterization of the magnetic domain configurations in cubic, isolated Fe3-xO4 nanoparticles with a lateral size of 25-30 nm. The magnetic polarity at remanence of single domain ferrimagnetic Fe3-xO4 nanoparticles deposited onto a carbon-silicon wafer is observed by magnetic force microscopy. The orientations of these domains provide a direct observation of the magneto-crystalline easy axes in each individual nanoparticle. Furthermore, the change in the domain orientation with an external magnetic field gives evidence of particle magnetization reversal mediated by a coherent rotation process that is also theoretically predicted by micromagnetic calculations.
这项工作报道了横向尺寸为25 - 30纳米的立方孤立Fe3 - xO4纳米颗粒中磁畴结构的实验表征。通过磁力显微镜观察沉积在碳硅晶片上的单畴亚铁磁性Fe3 - xO4纳米颗粒剩磁时的磁极性。这些磁畴的取向提供了对每个单独纳米颗粒中磁晶易轴的直接观察。此外，磁畴取向随外部磁场的变化证明了由相干旋转过程介导的颗粒磁化反转，这也是微磁计算从理论上预测的。
