ホーム > 研究活動 > 2019年 > Formation of Strong ∠ 10-FePd/α-Fe Nanocomposite Magnets by Visualizing Efficient Exchange Coupling

研究活動

Formation of Strong ∠ 10-FePd/α-Fe Nanocomposite Magnets by Visualizing Efficient Exchange Coupling

Nanoscale Adv. 2019, 1, 2598-2605. (DOI: 10.1039/c9na00225a)

2019年5月20日(月)

K. Matsumoto, R. Sato, T. T. Trinh, N. Sakuma, T. Shoji, M. Haruta, H. Kurata, and T. Teranishi

Abstract

Conceptual nanocomposite magnets (NCMs) composed of exchange-coupled hard/soft
magnetic phases have been expected to show excellent magnetic performance based on
simultaneous high coercivity (H c) and high saturation magnetization (M s). In our previous
works, however, the H c was considerably lower than its theoretical value (H a), which
prevented us from improving the performance of NCMs. Here, we show that the H c of isolated particulate L 10-FePd/α-Fe NCMs is dominated by their phase segregation into core/shell like structures versus Janus-like structures. Using first-order reversal curve (FORC) analysis, we clearly distinguished a microscopically undetectable difference in the phase-segregation structure in the NCMs, finding both efficient and inefficient exchange coupling. The nanostructurally controlled NCMs dominated by core/shell-like structure with efficient exchange coupling showed the largest energy product ((BH )max = 17.5 MGOe) in the Fe–Pd system and the highest H c/H a value (26.5%) among all NCM powders.



研究活動

文部科学省

文部科学省
元素戦略プロジェクト(活動紹介)
NIMS磁石パートナーシップ

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合