脈沖強(qiáng)磁場瞬態(tài)光學(xué)顯微成像系統(tǒng)的研制與應(yīng)用
發(fā)布時(shí)間：2019-01-18 17:51
【摘要】：近年來強(qiáng)磁場測量技術(shù)和其環(huán)境下的測量手段有了突飛猛進(jìn)的發(fā)展,在強(qiáng)磁場下材料的電子能態(tài)、磁矩、微觀結(jié)構(gòu)等會發(fā)生一系列改變,產(chǎn)生形形色色的物理效應(yīng),從而能夠?qū)Σ牧系牟煌锢頇C(jī)制進(jìn)行研究。目前脈沖強(qiáng)磁場和穩(wěn)態(tài)強(qiáng)磁場環(huán)境下的實(shí)驗(yàn)測量手段多種多樣,主要有磁化測量、電輸運(yùn)測量、電極化測量、比熱測量等等。其中穩(wěn)態(tài)強(qiáng)磁場下的磁光顯微成像通過利用光學(xué)顯微鏡成像的方法對樣品表面的微觀結(jié)構(gòu)進(jìn)行原位觀察取得了許多突破性的進(jìn)展,然而由于脈沖強(qiáng)磁場下的測量環(huán)境較為極端該顯微成像的方法并未普及。近十年來隨著高速成像技術(shù)、極低溫技術(shù)以及脈沖磁體技術(shù)的成熟,使得脈沖強(qiáng)磁場下顯微成像成為了可能,本文主要介紹了繼日本脈沖強(qiáng)磁場磁光顯微成像系統(tǒng)之后國內(nèi)首個(gè)脈沖強(qiáng)磁場下的瞬態(tài)光學(xué)顯微裝置的研制過程,并利用該裝置開展了一系列科學(xué)實(shí)驗(yàn)。論文主要內(nèi)容如下： 一、簡要介紹了強(qiáng)磁場實(shí)驗(yàn)技術(shù)的發(fā)展現(xiàn)狀以及目前強(qiáng)磁場環(huán)境下的主要測量手段,其中強(qiáng)磁場下利用磁光顯微成像的方法較常規(guī)方法能夠直接觀察到更多微觀細(xì)節(jié)。然而由于脈沖場下的諸多極端環(huán)境該手段仍主要局限于穩(wěn)態(tài)場,開發(fā)脈沖場下的磁光顯微成像將能在提高最大磁場的同時(shí)大大減小相對穩(wěn)態(tài)強(qiáng)磁場下磁光顯微成像裝置的成本以及對液氦的依賴性。 二、介紹了華中科技大學(xué)脈沖強(qiáng)磁場磁光克爾顯微成像裝置的研制過程,主要從脈沖電源、脈沖磁體、低溫真空系統(tǒng)、成像采集以及信號測量這幾個(gè)方面對系統(tǒng)結(jié)構(gòu)以及原理進(jìn)行了闡述。其中分別對磁場、低溫進(jìn)行了軟件仿真和實(shí)驗(yàn)測試,并對磁光克爾成像原理和信號采集處理方法進(jìn)行了介紹。 三、利用該裝置對鐵電材料CuFeO2進(jìn)行了磁光克爾顯微成像實(shí)驗(yàn),觀察了在極低溫環(huán)境下CuFeO2樣品表面磁疇的形貌以及磁場作用下克爾光強(qiáng)的變化。通過分析磁光克爾顯微成像照片的光強(qiáng)得到了樣品表面的磁化強(qiáng)度隨磁場的變化,證實(shí)了在該磁光成像顯微系統(tǒng)下利用克爾成像手段觀察樣品表面磁疇以及磁化趨勢的可能性。 四、利用磁光顯微成像系統(tǒng)對NiMn磁記憶合金溫度驅(qū)動馬氏體相變以及磁場驅(qū)動逆馬氏體相變進(jìn)行了細(xì)致的研究,首次通過顯微鏡原位觀察的手段給出了Ni-Mn-Sn合金相變的不可逆過程的直接證據(jù)。并對NiMnInAl合金的馬氏體磁驅(qū)動相變進(jìn)行了對比,同樣觀察到了NiMnInAl合金在磁場驅(qū)動下馬氏體相變的可逆過程。
[Abstract]:In recent years, the measurement technology of strong magnetic field and the measurement method under its environment have made rapid progress. In the strong magnetic field, a series of changes will take place in the electronic energy state, magnetic moment and microstructure of the material, which will produce various physical effects. It is possible to study different physical mechanisms of materials. At present, there are a variety of experimental methods in the environment of pulsed strong magnetic field and steady state strong magnetic field, such as magnetization measurement, electric transport measurement, electrode measurement, specific heat measurement and so on. Among them, the magneto-optical microimaging under the steady-state strong magnetic field has made many breakthrough progress by using the method of optical microscope imaging to observe the microstructure of the surface of the sample in situ. However, the method of microscopic imaging is not widely used because of the extreme measurement environment of pulsed strong magnetic field. With the development of high speed imaging technology, very low temperature technology and pulsed magnets technology, it is possible to make the microimaging under high pulse magnetic field possible in the last decade. This paper mainly introduces the development process of the first transient optical microscope device under high pulse magnetic field after the Japanese pulsed strong magnetic field magneto-optical microscopic imaging system. A series of scientific experiments have been carried out using the device. The main contents of this paper are as follows: 1. The development status of high magnetic field experimental technology and the main measurement methods under the environment of high magnetic field are briefly introduced. More microscopic details can be observed directly by using magneto-optical microscopic imaging under high magnetic field than by conventional methods. However, due to many extreme environments under the pulse field, the method is still mainly confined to the steady-state field. The development of magneto-optical microscopy imaging under pulsed field can increase the maximum magnetic field and reduce the cost of magneto-optical microscopy imaging device and its dependence on liquid helium compared with the steady-state strong magnetic field. Second, the development process of pulsed magnetic field magneto-optic Kerr microscopic imaging device in Huazhong University of Science and Technology is introduced, mainly from pulse power supply, pulse magnet, low temperature vacuum system, The structure and principle of the system are described in the aspects of imaging acquisition and signal measurement. The magnetic field and low temperature are simulated and tested by software, and the principle of magneto-optic Kerr imaging and the method of signal acquisition and processing are introduced. Thirdly, the magneto-optic Kerr microscopic imaging experiment of ferroelectric material CuFeO2 was carried out. The morphology of magnetic domain on the surface of CuFeO2 sample and the change of Kerr intensity under the action of magnetic field were observed at very low temperature. By analyzing the intensity of the magneto-optic Kerr microscopic images, the variation of the magnetization intensity with the magnetic field on the surface of the sample is obtained, and the possibility of observing the magnetic domain and the magnetization trend of the sample surface by using the Kerr imaging method under the magneto-optical imaging microscope system is confirmed. Fourthly, the temperature driven martensite transformation and the magnetic field driven inverse martensite transformation of NiMn magnetic memory alloy were studied by magneto-optical microscopy imaging system. For the first time, direct evidence of the irreversible process of phase transformation of Ni-Mn-Sn alloy was obtained by in situ microscope observation. The martensite magnetically driven transformation of NiMnInAl alloy was compared. The reversible process of martensite transformation in NiMnInAl alloy driven by magnetic field was also observed.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM936
本文編號：2410958
[Abstract]:In recent years, the measurement technology of strong magnetic field and the measurement method under its environment have made rapid progress. In the strong magnetic field, a series of changes will take place in the electronic energy state, magnetic moment and microstructure of the material, which will produce various physical effects. It is possible to study different physical mechanisms of materials. At present, there are a variety of experimental methods in the environment of pulsed strong magnetic field and steady state strong magnetic field, such as magnetization measurement, electric transport measurement, electrode measurement, specific heat measurement and so on. Among them, the magneto-optical microimaging under the steady-state strong magnetic field has made many breakthrough progress by using the method of optical microscope imaging to observe the microstructure of the surface of the sample in situ. However, the method of microscopic imaging is not widely used because of the extreme measurement environment of pulsed strong magnetic field. With the development of high speed imaging technology, very low temperature technology and pulsed magnets technology, it is possible to make the microimaging under high pulse magnetic field possible in the last decade. This paper mainly introduces the development process of the first transient optical microscope device under high pulse magnetic field after the Japanese pulsed strong magnetic field magneto-optical microscopic imaging system. A series of scientific experiments have been carried out using the device. The main contents of this paper are as follows: 1. The development status of high magnetic field experimental technology and the main measurement methods under the environment of high magnetic field are briefly introduced. More microscopic details can be observed directly by using magneto-optical microscopic imaging under high magnetic field than by conventional methods. However, due to many extreme environments under the pulse field, the method is still mainly confined to the steady-state field. The development of magneto-optical microscopy imaging under pulsed field can increase the maximum magnetic field and reduce the cost of magneto-optical microscopy imaging device and its dependence on liquid helium compared with the steady-state strong magnetic field. Second, the development process of pulsed magnetic field magneto-optic Kerr microscopic imaging device in Huazhong University of Science and Technology is introduced, mainly from pulse power supply, pulse magnet, low temperature vacuum system, The structure and principle of the system are described in the aspects of imaging acquisition and signal measurement. The magnetic field and low temperature are simulated and tested by software, and the principle of magneto-optic Kerr imaging and the method of signal acquisition and processing are introduced. Thirdly, the magneto-optic Kerr microscopic imaging experiment of ferroelectric material CuFeO2 was carried out. The morphology of magnetic domain on the surface of CuFeO2 sample and the change of Kerr intensity under the action of magnetic field were observed at very low temperature. By analyzing the intensity of the magneto-optic Kerr microscopic images, the variation of the magnetization intensity with the magnetic field on the surface of the sample is obtained, and the possibility of observing the magnetic domain and the magnetization trend of the sample surface by using the Kerr imaging method under the magneto-optical imaging microscope system is confirmed. Fourthly, the temperature driven martensite transformation and the magnetic field driven inverse martensite transformation of NiMn magnetic memory alloy were studied by magneto-optical microscopy imaging system. For the first time, direct evidence of the irreversible process of phase transformation of Ni-Mn-Sn alloy was obtained by in situ microscope observation. The martensite magnetically driven transformation of NiMnInAl alloy was compared. The reversible process of martensite transformation in NiMnInAl alloy driven by magnetic field was also observed.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM936
【共引文獻(xiàn)】
相關(guān)期刊論文 前1條
1 郭志英;洪才浩;邢海英;唐坤;鄭雷;徐偉;陳棟梁;崔明啟;趙屹東;;A new soft X-ray magnetic circular dichroism facility at the BSRF beamline 4B7B[J];Chinese Physics C;2015年04期
相關(guān)博士學(xué)位論文 前1條
1 鄧麗萍;Cu-Nb復(fù)合線材微觀組織演變及力學(xué)和電學(xué)性能的研究[D];重慶大學(xué);2014年
相關(guān)碩士學(xué)位論文 前5條
1 韋佳佳;Ni-Mn-In系列鐵磁形狀記憶合金的物性研究[D];山東大學(xué);2013年
2 鄒立穎;Cu-Nb金屬基復(fù)合材料熱變形本構(gòu)關(guān)系的研究[D];東北大學(xué);2012年
3 趙聰聰;強(qiáng)磁場下Cu-25%Ag合金的凝固及其大變形強(qiáng)化機(jī)制[D];東北大學(xué);2012年
4 陳哲;基于新磁驅(qū)動機(jī)制的鐵基磁控形狀記憶合金設(shè)計(jì)研究[D];東北大學(xué);2012年
5 陳家華;Ga2基Heusler合金的物性探索[D];北京化工大學(xué);2014年
，本文編號：2410958
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