Abstract
The development of magnets with higher performance is attracting increasing interest. The optimization of their microstructure is essential to enhance their properties, and a microstructure comprising magnetically isolated hard magnetic grains of a single-domain size has been proposed as an ideal structure for enhancing the coercivity of magnets. To obtain magnets with an ideal structure, we consider the fabrication of magnets by an approach based on core/shell nanoparticles with a hard magnetic core and a non-magnetic shell. In this study, to obtain particles for our proposed approach, we attempted to fabricate L10 Fe-Pt/SiO2-core/shell particles with submicron-sized cores less than the critical single-domain size. The fabrication of such core/shell particles was confirmed from morphology observations and XRD analysis of the particles. Although the formation of more desirable core/shell particles with submicron-sized single-crystal cores in the single-domain size range was not achieved, the fabricated core/shell particles showed a high coercivity of 25 kOe.
Highlights
Permanent magnets are widely used in various applications such as generators and motors, and the development of higher performance magnets is attracting increasing interest
The optimization of their microstructure is essential to enhance their properties, and a microstructure comprising magnetically isolated hard magnetic grains of a single-domain size has been proposed as an ideal structure for enhancing the coercivity of magnets.[1]
The additional peak between the (001) and (110) peaks of L10 Fe-Pt did not come from unwanted by-products generated during the annealing process, but instead from the double-sided tape used for fixing the particles during the X-ray diffraction (XRD) measurements
Summary
Permanent magnets are widely used in various applications such as generators and motors, and the development of higher performance magnets is attracting increasing interest. The particles sizes of the chemically synthesized Fe-Pt nanoparticles obtained in previous studies are less than several tens of nanometers.[3,4,5,6,7,8,9] In magnets composed of magnetic/nonmagnetic-core/shell nanoparticles with such small particles as the core material, the magnetization value is largely reduced owning to the relatively large volume fraction of the non-magnetic shells. From this point of view, core/shell particles with larger magnetic cores are preferable for the preparation of our proposed magnets. It is necessary to understand their structure and magnetic properties
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