基于脉冲强磁场的材料磁电效应测量系统设计及其应用
发布时间：2019-06-04 07:31
【摘要】：随着科技的发展,人们对器件小型化的需求越来越高,这就需要探索同时具有两种或着两种以上功能的新材料,以研制能够同时实现多种功能的新型器件。多功能材料,尤其是磁电材料一直受到研究者的广泛关注。但是,磁电材料中磁电耦合效应一般都非常微弱,传统的测量手段很难得到有效的磁电耦合信号,严重影响磁电效应及其物理机制的研究。强磁场和极低温作为极端实验条件,可以通过与电荷、自旋的相互作用改变物质的电子结构,揭示材料的微观性质。但传统的磁电材料测量方法并不适用于强磁场、极低温这种特殊的测量环境。因此,基于脉冲强磁场技术,我们研究设计了适用于强磁场、极低温环境下的磁电效应测量系统,并利用所搭建的系统对CuFeO2单晶样品的磁电效应进行了测量。本文主要内容如下： 一、介绍了脉冲强磁场的研究背景和发展现状。从多铁材料入手,介绍了磁电材料与多铁材料之间的联系与区别。总结了磁电材料中不同的磁电耦合机理以及磁电材料的研究现状。在目前正在使用的几种磁电效应测量方法的基础上,提出基于脉冲强磁场环境的磁电效应测量系统的设计方案。 二、结合脉冲强磁场、低温和电场,设计了一套基于脉冲强磁场的磁电效应测量系统。作者对测量系统的各个硬件组成部分进行了理论分析和实验研究,并对系统进行优化。该系统实现了最高磁感应强度60T、脉宽30ms的磁场环境以及2-300K连续可调的温度环境。与传统磁电效应测量装置相比,该系统磁场强度高,产生的极化电流信号强,更容易测量。同时由于脉冲强磁场具有较高的磁场变化率,利用所设计的测量系统还可用于研究材料磁电耦合的动力学行为。 三、基于脉冲强磁场特性以及测量系统硬件指标,使用LabVIEW设计编写了磁电效应测量软件,实现仪器的远程控制和测量。为了提高数据处理效率,设计了磁电效应测量系统数据处理软件。 四、在对所搭建的磁电效应测量系统各组成部分理论分析和实验的基础上,使用CuFeO2单晶样品对测量系统进行实验验证。随后利用设计的磁电效应测量系统,研究了CuFeO2单晶的磁电耦合行为,并通过施加不同扫描速率、不同场强大小的脉冲强磁场,对CuFeO2在不同温度下的磁电效应及其动力学行为进行了系统研究。实验结果证实该测量系统能在脉冲强磁场下稳定运行,所得结果准确可靠。
[Abstract]:With the development of science and technology, the demand for miniaturization of devices is getting higher and higher, so it is necessary to explore new materials with two or more functions at the same time, in order to develop new devices that can realize multiple functions at the same time. Multifunctional materials, especially magnetoelectric materials, have been widely concerned by researchers. However, the magnetoelectric coupling effect in magnetoelectric materials is generally very weak, so it is difficult to obtain effective magnetoelectric coupling signal by traditional measurement methods, which seriously affects the study of magnetoelectric effect and its physical mechanism. As extreme experimental conditions, strong magnetic field and extremely low temperature can change the electronic structure of the material through the interaction with charge and spin, and reveal the microscopic properties of the material. However, the traditional magnetoelectric material measurement method is not suitable for the special measurement environment of strong magnetic field and very low temperature. Therefore, based on the pulse strong magnetic field technology, we study and design a magnetoelectric effect measurement system suitable for high magnetic field and very low temperature environment, and use the built system to measure the magnetoelectric effect of CuFeO2 single crystal samples. The main contents of this paper are as follows: first, the research background and development status of pulse strong magnetic field are introduced. Starting with multi-iron materials, the relationship and difference between magnetoelectric materials and multi-iron materials are introduced. The different magnetoelectric coupling mechanisms and the research status of magnetoelectric materials in magnetoelectric materials are summarized. On the basis of several magnetoelectric effect measurement methods being used at present, a design scheme of magnetoelectric effect measurement system based on pulse strong magnetic field environment is proposed. Second, combined with pulse strong magnetic field, low temperature and electric field, a set of magnetoelectric effect measurement system based on pulse strong magnetic field is designed. The author makes theoretical analysis and experimental research on each hardware component of the measurement system, and optimizes the system. The system realizes the magnetic field environment with the highest magnetic induction intensity of 60T, the pulse width 30ms and the continuously adjustable temperature environment of 2 鈮，
本文编号：2492568
[Abstract]:With the development of science and technology, the demand for miniaturization of devices is getting higher and higher, so it is necessary to explore new materials with two or more functions at the same time, in order to develop new devices that can realize multiple functions at the same time. Multifunctional materials, especially magnetoelectric materials, have been widely concerned by researchers. However, the magnetoelectric coupling effect in magnetoelectric materials is generally very weak, so it is difficult to obtain effective magnetoelectric coupling signal by traditional measurement methods, which seriously affects the study of magnetoelectric effect and its physical mechanism. As extreme experimental conditions, strong magnetic field and extremely low temperature can change the electronic structure of the material through the interaction with charge and spin, and reveal the microscopic properties of the material. However, the traditional magnetoelectric material measurement method is not suitable for the special measurement environment of strong magnetic field and very low temperature. Therefore, based on the pulse strong magnetic field technology, we study and design a magnetoelectric effect measurement system suitable for high magnetic field and very low temperature environment, and use the built system to measure the magnetoelectric effect of CuFeO2 single crystal samples. The main contents of this paper are as follows: first, the research background and development status of pulse strong magnetic field are introduced. Starting with multi-iron materials, the relationship and difference between magnetoelectric materials and multi-iron materials are introduced. The different magnetoelectric coupling mechanisms and the research status of magnetoelectric materials in magnetoelectric materials are summarized. On the basis of several magnetoelectric effect measurement methods being used at present, a design scheme of magnetoelectric effect measurement system based on pulse strong magnetic field environment is proposed. Second, combined with pulse strong magnetic field, low temperature and electric field, a set of magnetoelectric effect measurement system based on pulse strong magnetic field is designed. The author makes theoretical analysis and experimental research on each hardware component of the measurement system, and optimizes the system. The system realizes the magnetic field environment with the highest magnetic induction intensity of 60T, the pulse width 30ms and the continuously adjustable temperature environment of 2 鈮，
本文编号：2492568
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