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

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

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1764-1767
Number of pages	4
Journal	Materials Transactions
Volume	46
Issue number	8
DOIs	https://doi.org/10.2320/matertrans.46.1764
Publication status	Published - 2005 Aug

Keywords

First-order transition
Itinerant-electron metamagnetic transition
Lorentz microscopy
Magnetic domain
Magnetocaloric effect
Magnetovolume effect
Transmission electron microscopy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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In situ TEM observation of thermally-induced first-order magnetic transition in itinerant-electron metamagnetic La(Fe _xSi _1-x) ₁₃ compounds. / Kawamoto, Naoyuki; Murakami, Yasukazu; Shindo, Daisuke; Fujieda, Shun; Fujita, Asaya; Fukamichi, Kazuaki.

In: Materials Transactions, Vol. 46, No. 8, 08.2005, p. 1764-1767.

Research output: Contribution to journal › Article › peer-review

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abstract = "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.",

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AU - Fukamichi, Kazuaki

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