In Situ TEM Observation of Thermally-Induced First-Order Magnetic Transition in Itinerant-Electron Metamagnetic La(FexSi1−x)13 Compounds

Naoyuki Kawamoto; Yasukazu Murakami; Daisuke Shindo; Shun Fujieda; Asaya Fujita; Kazuaki Fukamichi

doi:10.2320/matertrans.46.1764

In Situ TEM Observation of Thermally-Induced First-Order Magnetic Transition in Itinerant-Electron Metamagnetic La(Fe_xSi_1−x)₁₃ Compounds

Naoyuki Kawamoto, Yasukazu Murakami, Daisuke Shindo, Shun Fujieda, Asaya Fujita, Kazuaki Fukamichi

著者情報

キーワード: itinerant-electron metamagnetic transition, Lorentz microscopy, transmission electron microscopy, first-order transition, magnetic domain, magnetocaloric effect, magnetovolume effect

ジャーナルフリー

2005 年 46 巻 8 号 p. 1764-1767

DOI https://doi.org/10.2320/matertrans.46.1764

詳細

抄録

Defocus mode of Lorentz microscopy has revealed change in the magnetic microstructure with a first-order magnetic phase transition in La(Fe_xSi_1−x)₁₃ compounds (0.86≤x≤0.90). Upon heating specimens from the ferromagnetic phase to the paramagnetic phase, magnetic domains disappear instantaneously at the Curie temperature, concurrent with a substantial change in the volume. The observations are consistent with the feature of the first-order phase transition, which gives rise to extraordinary phenomena of these compounds such as large magnetocaloric effects.

責任著者(Corresponding author)

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