The introduction of magneto-dielectric substrates is required in the micro-strip antennas miniaturization due to the various dielectric and permeability constant. Most research work focus on the spherical structural Fe nanomaterials and the nanorods structures are rarely synthesized. In this paper, Fe-based nanorods have stepwise been synthesized with well maintaining their size and morphology by a moderate heat treatment of α-FeOOH nanorods. The magnetic and electromagnetic properties above GHz have been investigated. It is found that α-FeOOH, β-FeOOH and α-Fe₂O₃ nanorods have a constant real part of permittivity and low loss tangent tan δ_ε. And the γ-Fe₂O₃, Fe₃O₄, and Fe nanorods are observed a resonance peak at 3 GHz which is over their nature resonance frequency and a relatively large permeability than their spherical nanoparticles. Our results indicate that Fe-based nanorods have various permittivity and permeability properties which have great potential application in high-frequency electronic or spintronic devices.

由于各种介电常数和磁导率常数，微带天线小型化需要引入磁电介质基板。大多数研究工作集中在球形结构的铁纳米材料上，很少合成纳米棒结构。在本文中，通过对 α-FeO​​OH 纳米棒进行适度热处理，逐步合成了 Fe 基纳米棒，同时保持了其尺寸和形态。已经研究了 GHz 以上的磁性和电磁特性。发现α-FeO​​OH、β-FeOOH和α-Fe ₂ O ₃纳米棒具有恒定的介电常数实部和低损耗角正切tanδ _ε。而γ-Fe ₂ O ₃ , Fe ₃ O ₄, 和 Fe 纳米棒在 3 GHz 处观察到共振峰 , 这超过了它们的自然共振频率, 并且比它们的球形纳米粒子具有相对大的磁导率。我们的研究结果表明，铁基纳米棒具有多种介电常数和磁导率特性，在高频电子或自旋电子器件中具有巨大的应用潜力。