Guo Tengfei, Wang Jihao, Meng Wenjie, Zhang Jing, Feng Qiyuan, Wang Ze, Jin Feng, Wu Wenbin, Lu Qingyi, Hou Yubin, Lu Qingyou
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory and High Magnetic Field laboratory of Anhui Province, Chinese Academy of Sciences, Hefei, AnHui 230031, China; Hefei National Laboratory for Physical Sciences at Microscale and Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei, AnHui 230026, China.
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory and High Magnetic Field laboratory of Anhui Province, Chinese Academy of Sciences, Hefei, AnHui 230031, China.
Ultramicroscopy. 2020 Oct;217:113071. doi: 10.1016/j.ultramic.2020.113071. Epub 2020 Jul 16.
We present a mechanical rotatable magnetic force microscope (MFM) with precise angle control that can be operated in a 7 T superconducting magnet. An inertial piezoelectric motor called a SpiderDrive was used for the coarse approach because of its high compactness, high rigidity, and small size. Due to the mechanical rotation design, the MFM head can be rotated in a 7 T superconducting magnet with a bore size of 89 mm so that the direction of the magnetic field can be changed from 0° to 90° continuously. The highest in-plane magnetic field strength tested was 7 T. This is the first rotatable MFM ever reported. Using the homemade rotatable MFM, we investigated a 40 nm thick LaCaMnO (LCMO) thin film on NdGaO (100) substrate with anisotropy, determining that the charge-ordering insulating (COI) phase of the LCMO disappears as the direction of the magnetic field changed from 0° to 90°. Furthermore, the ferromagnetic pattern, appearing as bright and dark contrasts and similar to that formed by the S and N of a magnet, was seen parallel to the direction of the magnetic field. The rotatable MFM in this paper is expected to be widely used in studying the anisotropy of magnetic materials.
我们展示了一种具有精确角度控制的机械旋转磁力显微镜（MFM），它可以在7T超导磁体中运行。一种名为SpiderDrive的惯性压电电机因其高紧凑性、高刚性和小尺寸而被用于粗调接近。由于采用了机械旋转设计，MFM探头可以在孔径为89mm的7T超导磁体中旋转，从而使磁场方向可以在0°到90°之间连续变化。测试的最高面内磁场强度为7T。这是有史以来报道的第一台可旋转MFM。使用自制的可旋转MFM，我们研究了在NdGaO(100)衬底上具有各向异性的40nm厚的LaCaMnO（LCMO）薄膜，确定随着磁场方向从0°变为90°，LCMO的电荷有序绝缘（COI）相消失。此外，观察到与磁场方向平行的铁磁图案，呈现出明暗对比，类似于由磁体的S和N形成的图案。本文中的可旋转MFM有望广泛应用于研究磁性材料的各向异性。
