Nano Research

, Volume 10, Issue 10, pp 3421–3433 | Cite as

Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles

  • Changhai Wang
  • Aleksandr A. Levin
  • Julie Karel
  • Simone Fabbrici
  • Jinfeng Qian
  • Carlos E. ViolBarbosa
  • Siham Ouardi
  • Franca Albertini
  • Walter Schnelle
  • Jan Rohlicek
  • Gerhard H. Fecher
  • Claudia Felser
Research Article
  • 72 Downloads

Abstract

Phase transitions and magnetic properties of shape-memory materials can be tailored by tuning the size of the constituent materials, such as nanoparticles. However, owing to the lack of suitable synthetic methods for size-controlled Heusler nanoparticles, there is no report on the size dependence of their properties and functionalities. In this contribution, we present the first chemical synthesis of size-selected Co-Ni-Ga Heusler nanoparticles. We also report the structure and magnetic properties of the biphasic Co-Ni-Ga nanoparticles with sizes in the range of 30–84 nm, prepared by a SBA-15 nanoporous silicatemplated approach. The particle sizes could be readily tuned by controlling the loading and concentration of the precursors. The fractions and crystallite sizes of each phase of the Co-Ni-Ga nanoparticles are closely related to their particle size. Enhanced magnetization and decreased coercivity are observed with increasing particle size. The Curie temperature (Tc) of the Co-Ni-Ga nanoparticles also depends on their size. The 84 nm-sized particles exhibit the highest Tc (≈ 1,174 K) among all known Heusler compounds. The very high Curie temperatures of the Co-Ni-Ga nanoparticles render them promising candidates for application in high-temperature shape memory alloy-based devices.

Keywords

Co-Ni-Ga nanoparticles chemical synthesis size magnetic properties 

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Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Changhai Wang
    • 1
  • Aleksandr A. Levin
    • 1
  • Julie Karel
    • 1
  • Simone Fabbrici
    • 2
    • 3
  • Jinfeng Qian
    • 1
  • Carlos E. ViolBarbosa
    • 1
  • Siham Ouardi
    • 1
  • Franca Albertini
    • 2
  • Walter Schnelle
    • 1
  • Jan Rohlicek
    • 1
  • Gerhard H. Fecher
    • 1
  • Claudia Felser
    • 1
  1. 1.Max Planck Institute for Chemical Physics of SolidsDresdenGermany
  2. 2.Institute of Materials for Electronics and MagnetismIMEM-CNRParmaItaly
  3. 3.MIST E-R LaboratoryBolognaItaly

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