Meckler S, Gyamfi M, Pietzsch O, Wiesendanger R
Institute of Applied Physics and Microstructure Advanced Research Center Hamburg, University of Hamburg, Jungiusstr. 11, D-20355 Hamburg, Germany.
Rev Sci Instrum. 2009 Feb;80(2):023708. doi: 10.1063/1.3086428.
A new scanning tunneling microscope for spin-polarized experiments has been developed. The microscope is operated at 4.7 K in a superconducting triple axis vector magnet providing the possibility for measurements depending on the direction of the magnetic field. In single axis mode the maximum field is 5 T perpendicular to the sample plane and 1.3 T in the sample plane, respectively. In cooperative mode fields are limited to 3.5 T perpendicular and 1 T in plane. The microscope is operated in an ultrahigh vacuum system providing optimized conditions for the self-assembled growth of magnetic structures at the atomic scale. The available temperature during growth ranges from 10 up to 1100 K. The performance of the new instrument is illustrated by spin-polarized measurements on 1.6 atomic layers Fe/W(110). It is demonstrated that the magnetization direction of ferromagnetic Fe and Gd tips can be adjusted using the external magnetic field. Atomic resolution is demonstrated by imaging an Fe monolayer on Ru(0001).
一种用于自旋极化实验的新型扫描隧道显微镜已被研制出来。该显微镜在4.7 K的超导三轴矢量磁体中运行，这为根据磁场方向进行测量提供了可能性。在单轴模式下，垂直于样品平面的最大磁场为5 T，在样品平面内为1.3 T。在协同模式下，垂直方向的磁场限制为3.5 T，平面内为1 T。该显微镜在超高真空系统中运行，为原子尺度上磁性结构的自组装生长提供了优化条件。生长过程中的可用温度范围为10至1100 K。通过对1.6个原子层的Fe/W(110)进行自旋极化测量，展示了新仪器的性能。结果表明，利用外部磁场可以调整铁磁体Fe和Gd针尖的磁化方向。通过对Ru(0001)上的Fe单层进行成像，证明了原子分辨率。
