NDLI: Chemical synthesis of exchange-coupled nanocomposite magnets

Content Provider	IEEE Xplore Digital Library
Author	Liu, F. Hou, Y.
Copyright Year	2015
Description	Author affiliation: Dept. of Mater. Sci. & Eng., Peking Univ., Beijing, China (Liu, F.; Hou, Y.)
Abstract	Summary form only given. Nanocomposite magnets containing soft and hard magnetic phases have attracted immense attention for energy-related and biomedical applications. In particular, good control of the soft and hard phases at the nanoscale in the composites is of great importance for effective exchange coupling, allowing us to make the best of the strengths of soft and hard magnetic phases and to optimize the magnetic properties for targeted applications. Chemical methods offer an effective route to precisely control both phases at the nanoscale, and help understand magnetic interactions and develop advanced magnetic materials for various applications. In this talk, we will present recent progress on chemical synthesis of nanocomposite magnets. Firstly, a general protocol is reported to synthesize exchange-coupled nanoparticles with magnetically hard $L1_{0}-FePt$ as core and magnetically soft Co (or Ni, or $Fe_{2}C)$ as shell. These core/shell nanoparticles show shell thickness-dependent magnetic properties, providing an ideal model system for the study of exchange coupling at nanoscale, which will be essential for building superstrong magnets for various permanent magnet applications in the future. Secondly, we report a facile chemical route to prepare 200 nm single domain $SmCo_{5}@Co$ core/shell magnets with coercivity of 20.7 kOe and saturation magnetization of 82 emu/g. We found that the incorporation of graphene oxide sheets are responsible for the generation of the unique structure. The single domain $SmCo_{5}$ core contributes to the large coercivity of the magnets and the exchange-coupled Co shell enhances the magnetization. This method can be further utilized in the synthesis other Sm-Co based exchange-coupled magnets. Thirdly, we developed chemical ways to prepare $L1_{0}-FePd/-Fe$ and $Nd_{2}Fe_{14}B/-Fe$ nanocomposite magnets, providing a bottom-up approach using exchange-coupled nanocomposite magnets for engineering advanced permanent magnets with controllable magnetic properties.
Starting Page	1
Ending Page	1
File Size	145424
Page Count	1
File Format	PDF
e-ISBN	9781479973224
DOI	10.1109/INTMAG.2015.7157722
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-11
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Saturation magnetization Magnetic domains Magnetic cores Chemicals Soft magnetic materials Nanoscale devices Magnetic properties
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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