Abstract
Magnetic imaging plays an important role in clarifying the phase transformation mechanisms and/or the correlation between nanostructures and materials functions in magnetic compounds. Methods based on transmission electron microscopy (Lorentz microscopy and electron holography) are powerful tools for analyzing the aforementioned aspects, because these methods allow for nanometer-scale resolution and can be effectively combined with peripheral techniques such as electron diffraction and high-resolution transmission electron microscopy (lattice imaging). This chapter explains the essence of magnetic imaging and discusses recent topical studies on magnetic functional materials, to which these techniques have been applied to obtain useful information that helps understand the mechanisms underlying the extraordinary material properties. In particular, this chapter focuses on colossal magnetoresistive manganites and ferromagnetic shape-memory alloys, both of which are closely related to the issues of the disorder and strain-induced complexity.
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Acknowledgments
The experimental results presented in this chapter were acquired in collaborations with researchers in Tohoku University, Okinawa Institute of Science and Technology (OIST), Osaka Prefecture University, and JEOL Co. The author expresses his sincere gratitude to Professors D. Shindo, R. Kainuma, T. Arima, K. Oikawa, K. Ishida, Dr. T. Yano, Mr. S. Konno (Tohoku), Dr. A. Tonomura, Mr. H. Kasai, Dr. J.J. Kim, Mr. S. Mamishin (OIST), Prof. S. Mori (Osaka), and Mr. T. Suzuki (JEOL) for the very helpful discussions regarding the topics presented in this chapter.
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Murakami, Y. (2012). High-Resolution Visualizing Techniques: Magnetic Aspects. In: Kakeshita, T., Fukuda, T., Saxena, A., Planes, A. (eds) Disorder and Strain-Induced Complexity in Functional Materials. Springer Series in Materials Science, vol 148. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20943-7_9
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