Rare Metals

, Volume 37, Issue 5, pp 427–432 | Cite as

Room-temperature and high-temperature magnetic permeability of Co-doped nanocrystalline alloys

  • Bin Fu
  • Jie Han
  • Sheng-Qi Guo
  • Zhi Wang
  • Pan Zhang
  • Zi-Jiao Pan
  • Qiang Xu


Influence of composition and annealing temperature on structure and magnetic properties of amorphous and nanocrystalline Fe78.4−xCo x Si9B9Nb2.6Cu1 (x = 27.4, 40.0, 51.0, 78.4) alloys was investigated by X-ray diffraction (XRD) and the temperature dependence of permeability. According to the initial crystallization temperature (Tx1) from differential scanning calorimetry (DSC) curves of as-quenched amorphous alloys, 490–700 °C isothermal annealing was carried out to obtain the characteristic nanocrystalline structure. Furthermore, the soft magnetic properties were measured by temperature evolution of magnetic permeability to obtain the correlation between Co content, annealing temperature and magnetic permeability. The results show that, on the one hand, the annealing temperature exerts a significant effect on phase structure and initial permeability (μi). The higher-temperature (from 550 to 610 °C) annealed Co content nanocrystalline samples can remain higher μi at elevated temperature. On the other hand, partial substitution Fe by Co can improve the high-temperature magnetic stability; however, the room-temperature permeability of higher Co content alloys decreases obviously at the same time. This phenomenon was analyzed from the viewpoint of the saturation magnetic induction (Bs), magnetic anisotropy (<K>) and magnetostriction (λs).


Nanocrystalline alloys High-temperature soft magnetic properties Initial permeability FeCo-based alloy 



This study was financially supported by the National Natural Science Foundation of China (No. 11604242) and the Tianjin Research Program of Application Foundation and Advanced Technology, China (No. 14JCQNJC04000).


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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Tianjin Key Laboratory for Photoelectric Materials and Devices, School of Materials Science and EngineeringTianjin University of TechnologyTianjinChina
  2. 2.College of ScienceTianjin University of TechnologyTianjinChina
  3. 3.School of ScienceTianjin UniversityTianjinChina
  4. 4.School of Materials Science and EngineeringTianjin University of TechnologyTianjinChina

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