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、检测范围为1~80毫特（mT）的磁场计（高斯计，gaussmeter），其由简易电子元器件构成，并提出了其在基于自旋塞贝克效应（spin Seebeck effect）生成纯自旋流的实验装置中的应用方案。该装置通过USB线缆供电，借助基于C++语言开发、适配Arduino Uno的通信程序，搭配LabVIEW图形化界面，与计算机实现数据交互。为实现电磁铁内部等深部环境中的磁场测量，本研究开发了专用霍尔探头。该装置还配备LCD显示屏。本装置所采用的磁场传感器为SS49E，基于该传感器可获得具备合适分辨率与量程的测量结果。本研究开发的高斯计被应用于自旋塞贝克效应与自旋霍尔效应（spin Hall effect）研究的实验装置搭建中，借此估算了在钇铁石榴石（YIG）绝缘磁性薄膜上生长铂（Pt）薄膜所形成的双层结构的自旋霍尔角。综上，本研究开发的高斯计可同时应用于教学与科研场景，其核心优势为制造成本低廉，仅约22美元。