The fabrication of anisotropic nanocomposite exchange-spring magnets is demonstrated experimentally by using a gas-phase nanoparticle deposition technique. High resolution transmission electron microscopy images prove the experimental easy-axis definition of embedded hard magnetic nanoparticles in soft magnetic matrix. Exchange coupling between the hard and soft phases is confirmed by measuring recoil loops and δ M-H curve of the anisotropic FePt/ Fe0.8 Ni0.2 nanocomposite. The magnetic energy product for the anisotropic exchange-spring magnet is 224% higher than the isotropic case.
Bibliographical noteFunding Information:
This work was partially supported by Seagate Technology, National Science Foundation Minnesota MRSEC Program Facility, NSF Nano Fabrication Center at University of Minnesota, and the Institute of Technology Characterization Facility at University of Minnesota which receives partial support from NSF through the NNIN program.