Magnetic domain analysis by in-situ TEM observation of magnetic refrigerant La(Fe0.90Si0.10)13

N. Kawamoto; Y. Murakami; D. Shindo; K. Fukamichi; S. Fujieda; A. Fujita

doi:10.1016/j.jmmm.2006.10.954

Magnetic domain analysis by in-situ TEM observation of magnetic refrigerant La(Fe_0.90Si_0.10)₁₃

N. Kawamoto, Y. Murakami, D. Shindo, K. Fukamichi, S. Fujieda, A. Fujita

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

2 Citations (Scopus)

Abstract

The thermally induced first-order magnetic phase transition in a La(Fe_0.90Si_0.10)₁₃ compound has been observed at the Curie temperature T_C by using Lorentz microscopy in the Fresnel mode. On heating the specimen, the magnetic domains instantly disappeared at T_C due to the nature of the first-order phase transition. The coexistence of the ferromagnetic and paramagnetic phases was observed at T_C. The magnetic domain structure below T_C was unchanged by repeating the thermal cycles. This fact implies that the phase transition during thermal cycles does not induce any lattice defects that degrade the magnetocaloric effect.

Original language	English
Pages (from-to)	2815-2817
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.954
Publication status	Published - 2007 Mar 1

Keywords

Itinerant-electron metamagnetism
Lorentz microscopy
Magnetic domain
Magnetic refrigerant
Transmission electron microscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Magnetic domain analysis by in-situ TEM observation of magnetic refrigerant La(Fe0.90Si0.10)13",

abstract = "The thermally induced first-order magnetic phase transition in a La(Fe0.90Si0.10)13 compound has been observed at the Curie temperature TC by using Lorentz microscopy in the Fresnel mode. On heating the specimen, the magnetic domains instantly disappeared at TC due to the nature of the first-order phase transition. The coexistence of the ferromagnetic and paramagnetic phases was observed at TC. The magnetic domain structure below TC was unchanged by repeating the thermal cycles. This fact implies that the phase transition during thermal cycles does not induce any lattice defects that degrade the magnetocaloric effect.",

keywords = "Itinerant-electron metamagnetism, Lorentz microscopy, Magnetic domain, Magnetic refrigerant, Transmission electron microscopy",

author = "N. Kawamoto and Y. Murakami and D. Shindo and K. Fukamichi and S. Fujieda and A. Fujita",

year = "2007",

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T1 - Magnetic domain analysis by in-situ TEM observation of magnetic refrigerant La(Fe0.90Si0.10)13

AU - Kawamoto, N.

AU - Murakami, Y.

AU - Shindo, D.

AU - Fukamichi, K.

AU - Fujieda, S.

AU - Fujita, A.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - The thermally induced first-order magnetic phase transition in a La(Fe0.90Si0.10)13 compound has been observed at the Curie temperature TC by using Lorentz microscopy in the Fresnel mode. On heating the specimen, the magnetic domains instantly disappeared at TC due to the nature of the first-order phase transition. The coexistence of the ferromagnetic and paramagnetic phases was observed at TC. The magnetic domain structure below TC was unchanged by repeating the thermal cycles. This fact implies that the phase transition during thermal cycles does not induce any lattice defects that degrade the magnetocaloric effect.

AB - The thermally induced first-order magnetic phase transition in a La(Fe0.90Si0.10)13 compound has been observed at the Curie temperature TC by using Lorentz microscopy in the Fresnel mode. On heating the specimen, the magnetic domains instantly disappeared at TC due to the nature of the first-order phase transition. The coexistence of the ferromagnetic and paramagnetic phases was observed at TC. The magnetic domain structure below TC was unchanged by repeating the thermal cycles. This fact implies that the phase transition during thermal cycles does not induce any lattice defects that degrade the magnetocaloric effect.

KW - Itinerant-electron metamagnetism

KW - Lorentz microscopy

KW - Magnetic domain

KW - Magnetic refrigerant

KW - Transmission electron microscopy

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