發(fā)布時(shí)間：2018-01-19 08:15

  本文關(guān)鍵詞： 磁光克爾效應(yīng) 各向異性材料 磁光橢偏技術(shù) 磁光克爾成像系統(tǒng) 磁疇成像效果優(yōu)化　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著磁光器件如磁光存儲(chǔ)器件、磁光傳感器件、自旋電子器件等在信息、醫(yī)療、國(guó)防等技術(shù)領(lǐng)域的廣泛應(yīng)用,對(duì)高性能磁光材料的需求也日益提升,提升現(xiàn)有磁光材料的性能以及探索新型的磁光材料均需要高效的磁光材料表征方法�；诖殴庑�(yīng)的各種磁光表征技術(shù)通過(guò)測(cè)量光與磁光材料相互作用產(chǎn)生的新的光學(xué)各向異性實(shí)現(xiàn)對(duì)磁光材料器件的無(wú)損檢測(cè),而且磁光表征技術(shù)具有高測(cè)試精度、高靈敏度、高時(shí)間分辨率和高空間分辨率以及高強(qiáng)的磁場(chǎng)兼容性等優(yōu)點(diǎn),因此可以為磁光材料性能的研究和應(yīng)用提供先進(jìn)的測(cè)量工具。本文主要對(duì)基于磁光克爾效應(yīng)的磁光材料表征方法進(jìn)行了研究。對(duì)各向異性磁性材料的縱向磁光克爾表征理論進(jìn)行了研究,建立了各向異性磁光材料的縱向克爾理論模型,給出了各向異性材料的縱向磁光克爾偏轉(zhuǎn)角表達(dá)式。并利用該公式對(duì)各向異性Co薄膜材料的磁光性能進(jìn)行了模擬分析,分析結(jié)果表明各向異性Co薄膜的磁光性能優(yōu)于各向同性Co薄膜材料,這為基于Co薄膜材料的磁光器件的研究提供了理論基礎(chǔ)。磁光橢偏技術(shù)結(jié)合了橢偏理論和磁光克爾理論,可以同時(shí)對(duì)磁光材料的光學(xué)參數(shù)和磁光參數(shù)進(jìn)行表征。本文利用自制的磁光橢偏系統(tǒng)對(duì)CoFeB薄膜的磁光性能進(jìn)行了測(cè)量,得到了 CoFeB薄膜的光學(xué)常數(shù)以及磁光耦合系數(shù),實(shí)驗(yàn)結(jié)果對(duì)CoFeB材料在磁性隧道結(jié),高密度磁存儲(chǔ)等領(lǐng)域的應(yīng)用具有積極的意義。對(duì)磁光材料的磁性機(jī)理進(jìn)行研究可以更好的理解磁光材料的本質(zhì)從而提高磁光材料的性能,而對(duì)磁疇的結(jié)構(gòu)和行為進(jìn)行研究是探索材料磁性機(jī)理最直接的方法。本文對(duì)寬視場(chǎng)磁光克爾成像系統(tǒng)的結(jié)構(gòu)進(jìn)行了構(gòu)建,并提出了一種通過(guò)優(yōu)化磁光克爾成像系統(tǒng)中的偏振器方位角對(duì)磁光克爾成像系統(tǒng)的對(duì)比度和信噪比進(jìn)行優(yōu)化的方法,為直觀的研究磁光材料的磁疇結(jié)構(gòu)行為提供了先進(jìn)的測(cè)量工具。
[Abstract]:With the wide application of magneto-optic devices such as magneto-optical storage devices, magneto-optic sensing devices, spin electronic devices in information, medical, national defense and other technical fields, the demand for high-performance magneto-optic materials is also increasing. It is necessary to improve the properties of existing magneto-optic materials and to explore new magneto-optic materials. New methods of magneto-optic characterization based on magneto-optic effect are introduced by measuring the interaction between optical and magneto-optic materials. Optical anisotropy is used to realize nondestructive testing of magneto-optic materials. Moreover, magneto-optical characterization technology has the advantages of high testing accuracy, high sensitivity, high temporal resolution and high spatial resolution, and high magnetic compatibility. In this paper, the characterization method of magneto-optic materials based on magneto-optic Kerr effect is studied. The longitudinal magneto-optic grams of anisotropic magnetic materials are studied. The theory of representation is studied. The longitudinal Kerr model of anisotropic magneto-optic materials is established. The expression of longitudinal magneto-optic Kerr deflection angle of anisotropic materials is given, and the magneto-optic properties of anisotropic Co thin films are simulated and analyzed by using the formula. The results show that the magneto-optic properties of anisotropic Co thin films are better than that of isotropic Co thin films. This provides a theoretical basis for the study of magneto-optic devices based on Co thin film materials. Magneto-optical ellipsometry combines ellipsometry theory with magneto-optical Kerr theory. The optical and magneto-optical parameters of magneto-optic materials can be characterized at the same time. The magneto-optical properties of CoFeB thin films have been measured by self-made magneto-optical ellipsometry system. The optical constants and magneto-optic coupling coefficients of CoFeB thin films are obtained. The experimental results show that the CoFeB films are connected in magnetic tunnel junctions. The research on magnetic mechanism of magneto-optic materials can better understand the essence of magneto-optic materials and improve the properties of magneto-optic materials. The study of magnetic domain structure and behavior is the most direct way to explore the magnetic mechanism of materials. In this paper, the structure of wide-field magneto-optic Kerr imaging system is constructed. A method is proposed to optimize the contrast and SNR of magneto-optic Kerr imaging system by optimizing the azimuth of polarizer. It provides an advanced measurement tool for the direct study of magnetic domain structure behavior of magneto-optic materials.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB383.2;O482.55

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