Formation of strong L1(0)-FePd/α-Fe nanocomposite magnets by visualizing efficient exchange coupling.
Formation of strong L1(0)-FePd/α-Fe nanocomposite magnets by visualizing efficient exchange coupling.
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DOI：
10.1039/c9na00225a
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发表时间：
2019-07-10
影响因子：
4.7
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中科院分区：
文献类型：
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由交换耦合硬/软磁相组成的概念纳米复合磁体（NCM）预计将表现出基于同时高矫顽力（Hc）和高饱和磁化强度（Ms）的优异磁性能。然而，在我们之前的工作中，Hc 远低于其理论值 (Ha)，这阻碍了我们提高 NCM 的性能。在这里，我们表明，孤立颗粒 L10-FePd/α-Fe NCM 的 Hc 主要由它们的相分离成核/壳状结构与 Janus 状结构决定。使用一阶反转曲线 (FORC) 分析，我们清楚地区分了 NCM 中相分离结构中微观上无法检测到的差异，发现了有效和低效的交换耦合。以具有高效交换耦合的核/壳结构为主的纳米结构控制的NCM在Fe-Pd体系中表现出最大的能量积（(BH)max = 17.5 MGOe），并且在所有NCM粉末中表现出最高的Hc/Ha值（26.5%）。 FORC 分析区分了纳米复合磁体中相分离结构中微观上无法检测到的差异，发现了有效和低效的交换耦合。
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 (Hc) and high saturation magnetization (Ms). In our previous works, however, the Hc was considerably lower than its theoretical value (Ha), which prevented us from improving the performance of NCMs. Here, we show that the Hc of isolated particulate L10-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 Hc/Ha value (26.5%) among all NCM powders. FORC analysis distinguished a microscopically undetectable difference in phase-segregation structure in nanocomposite magnets, finding both efficient and inefficient exchange coupling.
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影响因子：
3.2
作者：
MAYERGOYZ, ID
通讯作者：
MAYERGOYZ, ID
影响因子：
3.7
作者：
KOU, XC;KRONMULLER, H;ROSSIGNOL, MF
通讯作者：
ROSSIGNOL, MF
影响因子：
8.6
作者：
He, Zhanbing;Maurice, Jean-Luc;Cojocaru, Costel Sorin
通讯作者：
Cojocaru, Costel Sorin
影响因子：
15
作者：
Teranishi, Toshiharu;Wachi, Ayako;Nakaya, Masafumi
通讯作者：
Nakaya, Masafumi
影响因子：
15
作者：
Song, Q;Zhang, ZJ
通讯作者：
Zhang, ZJ