Karc Özgür, Çelik Ümit, Oral Ahmet
NanoMagnetics Instruments Ltd., METU Technopolis, 06800 Çankaya, Ankara, Turkey.
Rev Sci Instrum. 2020 Jan 1;91(1):013703. doi: 10.1063/1.5120007.
In this publication, we describe the design of a new fiber Fabry-Pérot interferometer and employ this to a low temperature atomic force/magnetic force microscope (LT-AFM/MFM) operating in the 4-300 K temperature range. A multilayer dielectric mirror coated optical fiber is used to achieve unprecedented 1 fm/Hz noise level, while the shot noise limit is 0.51 fm/Hz. The cavity length is adjustable, and the fiber can be brought within a very close proximity of the cantilever using a dedicated 2 mm stroke piezonanopositioner integrated on the piezotube scanner. The same nanopositioner also is used to park the fiber at a safe parking location during cantilever exchange. We demonstrate the performance of the LT-AFM/MFM by imaging the ITO thin film at 300 K, atomic steps on HOPG at 300 K, magnetic bits on the hard disk at 15 K, and the Abrikosov vortex lattice in the BSCCO(2122) single crystal at 4 K.
在本出版物中，我们描述了一种新型光纤法布里-珀罗干涉仪的设计，并将其应用于工作在4至300 K温度范围内的低温原子力/磁力显微镜（LT-AFM/MFM）。使用涂覆多层介质镜的光纤实现了前所未有的1 fm/Hz噪声水平，而散粒噪声极限为0.51 fm/Hz。腔长可调，通过集成在压电管扫描器上的专用2 mm行程压电纳米定位器，可将光纤置于非常靠近悬臂的位置。在悬臂更换期间，同一纳米定位器还用于将光纤停放在安全的停放位置。我们通过对300 K下的ITO薄膜、300 K下HOPG上的原子台阶、15 K下硬盘上的磁位以及4 K下BSCCO(2122)单晶中的阿布里科索夫涡旋晶格进行成像，展示了LT-AFM/MFM的性能。
