Magnetic and Structural Properties of Melt-Spun Co-Ge Ribbons

ORAL

Abstract

The Co-Ge materials is a key subsystem of Heusler alloys and have attracted much interest because they play an important role in the field of integrated circuits [1, 2]. In this work, we have investigated the magnetic and structural properties of Co-Ge melt-spun ribbons in an attempt to understand better the behavior of our Co2Ge nanoparticles prepared by the cluster-beam deposition technique. Melt-spun ribbons with different compositions and different wheel speeds were prepared. Our data showed that small variations in the Co content and wheel speed lead to different structures and magnetic properties. The ribbons with 65% Co composition are ferromagnetic at room temperature with Curie temperatures larger than 800 K in contrast to previous reports that claimed to be ferromagnetic at cryogenic temperatures [3]. The contradiction with the literature could be attributed to the difference in grain size in the ribbons and can explain the effect of size on the magnetic properties of our nanoparticles.

[1] Y. Xin et al., Intermetallics, 2017, 80, 10-15.
[2] Chun-I Tsai et al., ACS Nano 2011, 5, 9552−9558.
[3] G. F. Zhou and H. Bakker, Phys. Rev. B, 1993, 48, 13383.

*
This work was supported by DOE Grants DE-FG02-90ER45413 and DE-FG02-04ER4612

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Presenters

  • Onur Tosun

    • Physics and Astronomy, University of Delaware

Authors

  • Onur Tosun

    • Physics and Astronomy, University of Delaware

  • Frank M Abel

    • Physics and Astronomy, University of Delaware
    • University of Delaware

  • Balamurugan Balasubramanian

    • Physics & Astronomy, University of Nebraska, Lincoln
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln

  • Ralph Skomski

    • Physics & Astronomy, University of Nebraska, Lincoln
    • Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • David Sellmyer

    • Physics & Astronomy, University of Nebraska, Lincoln
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln
    • Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • George C Hadjipanayis

    • Physics and Astronomy, University of Delaware
    • University of Delaware