论文标题
底物夹在各向异性和域结构中的作用在倾斜的抗铁磁铁$α$ -FE $ _2 $ o $ $ _3 $中的作用
Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet $α$-Fe$_2$O$_3$
论文作者
论文摘要
抗铁磁铁最近通过革命性记忆技术的高潜力推动了Spintronics的最前沿。为此，了解域结构的形成和驱动机制至关重要。在这项工作中，我们研究了薄膜的抗fiferromagnet $α$ -fe $ _2 $ o $ $ _3 $中的域结构。我们发现，驱动域形成的内部击打场并不遵循$α$ -fe $ _2 $ o $ $ _3 $的晶体对称性，而是由于基板夹紧而波动。这导致Néel顺序的总体各向同性分布，在抗铁磁薄膜中具有局部有效的各向异性。此外，我们表明$α$ -FE $ _2 $ o $ _3 $的弱铁磁性质导致对磁场的质量不同，与诸如Nio的共线抗fiferromagnets相比。从我们的工作中获得的见解是进一步研究抗铁磁薄膜域结构的电气和光学操纵的基础。
Antiferromagnets have recently been propelled to the forefront of spintronics by their high potential for revolutionizing memory technologies. For this, understanding the formation and driving mechanisms of the domain structure is paramount. In this work, we investigate the domain structure in a thin-film canted antiferromagnet $α$-Fe$_2$O$_3$. We find that the internal destressing fields driving the formation of domains do not follow the crystal symmetry of $α$-Fe$_2$O$_3$, but fluctuate due to substrate clamping. This leads to an overall isotropic distribution of the Néel order with locally varying effective anisotropy in antiferromagnetic thin films. Furthermore, we show that the weak ferromagnetic nature of $α$-Fe$_2$O$_3$ leads to a qualitatively different dependence on magnetic field compared to collinear antiferromagnets such as NiO. The insights gained from our work serve as a foundation for further studies of electrical and optical manipulation of the domain structure of antiferromagnetic thin films.
