Ferromagnetic resonance heating of Fe and Fe3O4 by 5.8GHz microwave irradiation

Noboru Yoshikawa; Tomotsugu Kato

doi:10.1088/0022-3727/43/42/425403

Ferromagnetic resonance heating of Fe and Fe₃O₄ by 5.8GHz microwave irradiation

Noboru Yoshikawa, Tomotsugu Kato

ENG - Graduate School of Engineering (Common - Materials Science and Engineering)

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

14 Citations (Scopus)

Abstract

Compressed Fe₃O₄ powder and Fe sheet were pre-heated to various temperatures higher than 300 °C in a microwave magnetic field (h^rf). Then an external static magnetic field (H^ext) was imposed perpendicularly to h^rf and the temperature increased (ΔT: temperature difference from the pre-heated temperature, ΔT _max: ∼200 °C (Fe), ∼50 °C(Fe₃O ₄)). It had a peak at almost the same H^ext during ascent and descent of H^ext because of ferromagnetic resonance (FMR). In fact, ΔT became smaller as the preheating temperature was raised to approach the Curie temperature, and H^ext corresponding to the temperature peak shifted higher. This report provides FMR heating data under various conditions with quantitative discussion and proposes application of a new heat treatment to materials.

Original language	English
Article number	425403
Journal	Journal of Physics D: Applied Physics
Volume	43
Issue number	42
DOIs	https://doi.org/10.1088/0022-3727/43/42/425403
Publication status	Published - 2010 Oct 27

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Acoustics and Ultrasonics
Surfaces, Coatings and Films

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10.1088/0022-3727/43/42/425403

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title = "Ferromagnetic resonance heating of Fe and Fe3O4 by 5.8GHz microwave irradiation",

abstract = "Compressed Fe3O4 powder and Fe sheet were pre-heated to various temperatures higher than 300 °C in a microwave magnetic field (hrf). Then an external static magnetic field (Hext) was imposed perpendicularly to hrf and the temperature increased (ΔT: temperature difference from the pre-heated temperature, ΔT max: ∼200 °C (Fe), ∼50 °C(Fe3O 4)). It had a peak at almost the same Hext during ascent and descent of Hext because of ferromagnetic resonance (FMR). In fact, ΔT became smaller as the preheating temperature was raised to approach the Curie temperature, and Hext corresponding to the temperature peak shifted higher. This report provides FMR heating data under various conditions with quantitative discussion and proposes application of a new heat treatment to materials.",

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AU - Yoshikawa, Noboru

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N2 - Compressed Fe3O4 powder and Fe sheet were pre-heated to various temperatures higher than 300 °C in a microwave magnetic field (hrf). Then an external static magnetic field (Hext) was imposed perpendicularly to hrf and the temperature increased (ΔT: temperature difference from the pre-heated temperature, ΔT max: ∼200 °C (Fe), ∼50 °C(Fe3O 4)). It had a peak at almost the same Hext during ascent and descent of Hext because of ferromagnetic resonance (FMR). In fact, ΔT became smaller as the preheating temperature was raised to approach the Curie temperature, and Hext corresponding to the temperature peak shifted higher. This report provides FMR heating data under various conditions with quantitative discussion and proposes application of a new heat treatment to materials.

AB - Compressed Fe3O4 powder and Fe sheet were pre-heated to various temperatures higher than 300 °C in a microwave magnetic field (hrf). Then an external static magnetic field (Hext) was imposed perpendicularly to hrf and the temperature increased (ΔT: temperature difference from the pre-heated temperature, ΔT max: ∼200 °C (Fe), ∼50 °C(Fe3O 4)). It had a peak at almost the same Hext during ascent and descent of Hext because of ferromagnetic resonance (FMR). In fact, ΔT became smaller as the preheating temperature was raised to approach the Curie temperature, and Hext corresponding to the temperature peak shifted higher. This report provides FMR heating data under various conditions with quantitative discussion and proposes application of a new heat treatment to materials.

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Ferromagnetic resonance heating of Fe and Fe₃O₄ by 5.8GHz microwave irradiation

Abstract

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