Lehnert A, Buluschek P, Weiss N, Giesecke J, Treier M, Rusponi S, Brune H
Institute of the Physics of Nanostructures, Ecole Polytechnique Federale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
Rev Sci Instrum. 2009 Feb;80(2):023902. doi: 10.1063/1.3077148.
A surface magneto-optic Kerr effect (MOKE) setup fully integrated in an ultrahigh vacuum chamber is presented. The system has been designed to combine in situ MOKE and scanning tunneling microscopy. Magnetic fields up to 0.3 T can be applied at any angle in the transverse plane allowing the study of in-plane and out-of-plane magnetization. The setup performance is demonstrated for a continuous film of 0.9 monolayers (ML) Co/Rh(111) with in-plane easy axis and for a superlattice of nanometric double layer Co islands on Au(11,12,12) with out-of-plane easy axis. For Co/Au(11,12,12) we demonstrate that the magnetic anisotropy energies deduced from thermally induced magnetization reversal and from applying a torque onto the magnetization by turning the field are the same. For the presented setup we establish a coverage detection limit of 0.5 ML for transverse and 0.1 ML for polar MOKE. For island superlattices with the density of Co/Au(11,12,12), the latter limit corresponds to islands composed of about 50 atoms. The detection limit can be further reduced when optimizing the MOKE setup for either one of the two Kerr configurations.
介绍了一种完全集成在超高真空腔中的表面磁光克尔效应（MOKE）装置。该系统旨在将原位MOKE与扫描隧道显微镜相结合。在横向平面内的任何角度都可以施加高达0.3 T的磁场，从而能够研究面内和面外磁化。对于具有面内易轴的0.9单层（ML）Co/Rh(111)连续薄膜以及具有面外易轴的Au(11,12,12)上的纳米双层Co岛超晶格，展示了该装置的性能。对于Co/Au(11,12,12)，我们证明了从热致磁化反转以及通过旋转磁场对磁化施加扭矩推导得到的磁各向异性能量是相同的。对于所展示的装置，我们确定横向MOKE的覆盖检测极限为0.5 ML，极向MOKE的覆盖检测极限为0.1 ML。对于具有Co/Au(11,12,12)密度的岛状超晶格，后一极限对应于由约50个原子组成的岛。当针对两种克尔配置中的任何一种优化MOKE装置时，检测极限可以进一步降低。
