Synchronous enhancement and broadening of dielectric loss and magnetic loss is a key factor for achieving excellent microwave absorption behavior. However, one term’s reinforcement always comes at the expense of the other one. In this work, a new kind of core-shell structured nanoparticle has been designed and prepared by arc-discharge method, in which GdFeO is shell and Fe (Gd) solid solution works as core, respectively. Except for the typical interfacial polarization and natural resonance, the new dipole induced by asymmetric electric charge arising from substituted Gd in Fe lattice results in enhanced and broadened dielectric loss, and the strong local magnetic anisotropy induced by intensive magnetic Fe-Gd coupling between 3d-4 f electrons leads to enhanced and broadened magnetic loss. Synchronously widened and enhanced dielectric and magnetic loss ensure that GdFeO-encapsulated Fe(Gd) nanoparticles have effective absorption bandwidth of 4.16 GHz (10.48–14.64 GHz) at 2.3 mm, compared with that (2.32 GHz at 4.9 mm) of Fe nanoparticles. This study develops an approach for synchronously enhancing dielectric loss and magnetic loss, which has potential for achieving excellent EM absorption behaviors.

中文翻译：

---

GdFeO3 封装的 Fe (Gd) 纳米粒子中取代 Gd 引起的介电损耗和磁损耗的同步增强和展宽


介电损耗和磁损耗的同步增强和展宽是实现优异微波吸收行为的关键因素。然而，一个术语的强化总是以牺牲另一个术语为代价。本工作采用电弧放电法设计并制备了一种新型核壳结构纳米粒子，其中GdFeO为壳，Fe(Gd)固溶体为核。除了典型的界面极化和自然共振之外，Fe晶格中取代Gd产生的不对称电荷引起的新偶极子导致介电损耗增强和展宽，并且3d-Fe-Gd之间的强磁耦合引起强局部磁各向异性。 4f 电子导致磁损耗增强和扩大。同步加宽和增强的介电损耗和磁损耗确保了 GdFeO 封装的 Fe(Gd) 纳米颗粒在 2.3mm 处具有 4.16GHz（10.48-14.64GHz）的有效吸收带宽，而 Fe 纳米颗粒的有效吸收带宽（4.9mm 处为 2.32GHz）。这项研究开发了一种同步增强介电损耗和磁损耗的方法，有可能实现优异的电磁吸收行为。