Construction of a magnetic field meter for use in processes of generation and manipulation of pure spin currents

In this work we present the construction of a magnetic field meter (gaussmeter) with high sensitivity and detection from 1 to 80 mT, consisting of simple electronic components, with a proposal of application in an experimental setup for the generation of pure spin currents through the effect spin Seebeck. Through a USB cable, the device is powered and exchanges data with a computer via communication in C + + language with Arduino Uno, together with a LabVIEW graphical interface. To perform measurements in deep environments, such as inside electromagnets, a Hall probe was developed. The equipment also has an LCD screen. The magnetic field sensor used is the SS49E, with which it was possible to obtain measurements with appropriate resolution and range. The developed gaussmeter was used in the development of an experimental setup for investigations of the spin Seebeck and spin Hall effects, where it was possible to estimate the spin Hall angle for bilayers formed by a platinum (Pt) film grown on a YIG insulating magnetic film. Therefore, the developed gaussmeter has the potential to be used both in teaching and research environments and its main advantage is the low production cost, approximately US$ 22.00.本研究构建了一款高灵敏度、测量范围覆盖1至80毫特斯拉的磁场计（高斯计，gaussmeter），其仅由简易电子元件组成，并提出了将其应用于基于自旋塞贝克效应（spin Seebeck effect）制备纯自旋流的实验装置的方案。该设备通过USB线缆供电，并依托基于C++语言的通信协议与Arduino Uno开发板实现与计算机的数据交互，配套LabVIEW图形化界面。为实现电磁铁内部等深置环境下的磁场测量，本研究开发了霍尔探头（Hall probe）；该设备还配备液晶显示屏（LCD screen）。本次研发采用的磁场传感器为SS49E，依托该传感器可获得符合要求的分辨率与量程的测量结果。所研制的高斯计已应用于自旋塞贝克效应与自旋霍尔效应（spin Hall effect）相关的实验装置开发工作，并借此估算出了以钇铁石榴石（YIG）绝缘磁性薄膜为衬底生长铂（Pt）薄膜所形成的双层膜的自旋霍尔角（spin Hall angle）。综上，本研究开发的高斯计兼具教学与科研应用潜力，其核心优势在于制造成本低廉，仅约22美元。