Magnetocaloric effect of field-induced ferromagnet BaFeO $_{3}$ and Fe-site-substituted materials

Yoshii, Kenji ; Hayashi, Naoaki*; Mizumaki, Masaichiro*; Matsumura, Daiju ; Takano, Mikio*

We give an invited talk on the magnetocaloric effect (MCE) of new ferromagnetic oxide BaFeO $_{3}$ . This oxide has a cubic structure and shows the Curie temperature of 110 K due to the ordering of Fe $^{4+}$ spins. The MCE measurements showed the large change of magnetic entropy of 5.8Jkg $^{-1}$ K $^{-1}$ at around the Curie temperature. This is the largest value among the materials without rare earth elements. No thermal and field hysteresis was found, a property which is suitable for application, owing to small energy losses. This is attributed to the actual state of Fe ion of Fe $^{3+}$ , having no orbital magnetic moment. We will briefly discuss the properties of Fe-site-substituted materials.

Language	:	English
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Meeting title	:	2014 EMN (Energy Materials Nanotechnology) Summer Meeting
Held date	:	2014/06
Location (city)	:	Cancn
Location (country)	:	Mexico
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Keywords	:	no keyword
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Registration No. : BB20140363
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Magnetocaloric effect of field-induced ferromagnet BaFeO and Fe-site-substituted materials

Magnetocaloric effect of field-induced ferromagnet BaFeO $_{3}$ and Fe-site-substituted materials