Magnetic characteristics of Fe3O4/alpha-Fe2O3 hybrid cubes

作者：Ma, Ji; Chen, Kezheng^*; Zhang, Xiaodan

来源：Journal of Applied Physics, 2012, 111(3): 033925.

DOI：10.1063/1.3684996

• SURFACE SPIN DISORDER
• WEAK FERROMAGNETISM
• EPITAXIAL-GROWTH
• TEMPERATURE
• NANOPARTICLES
• ALPHA-FE2O3
• TRANSITION
• PARTICLES
• FILMS
• SEMICONDUCTORS

The high spin polarized Fe3O4 was incorporated with alpha-Fe2O3 a to form micro-cubes with high Curie temperature. It was observed that the magnetic characteristics of such hybrid structure are quite different from those of pure Fe3O4 or a-Fe2O3 phase, such as the absence of hematite Morin transition and the strong temperature dependence of magnetite saturated magnetization. The absence of Morin transition in Fe3O4/a-Fe2O3 hybrid cubes not only excludes the possibility of simply mixture of Fe3O4 and a-Fe2O3 components during the synthetic process, but also confirms that the introduction of high spin polarized Fe3O4 provides another way for the extinction of hematite Morin temperature apart from formerly reported factors, such as the particle size, shape, crystallinity, and surface properties. Moreover, the observed strong temperature dependence of magnetite saturation behavior has not been reported experimentally so far. Both intriguing phenomena could be ascribed to the magnetic interactions between Fe3O4 and alpha-Fe2O3 components, which are of great importance not only for the understanding of mutually magnetic influence between high spin polarized materials and semiconducting matrix, but also for the potential applications in fabricating spin devices. 2012 American Institute of Physics. [doi : 10.1063/1.3684996]

• 出版日期2012-2-1
• 单位青岛科技大学