Magnetism of CoSi Nanoparticles with B20-Type Structure

ORAL

Abstract

Magnetic nanoparticles or clusters often exhibit novel magnetic properties compared to isostructural bulk alloys due to low-dimensional and quantum-confinement effects.1,2 Magnetic materials with noncentrosymmetric B20 cubic structure have attracted much interest due to skyrmion spin structures originating from Dzyaloshinskii-Moriya interactions.3 We have used a cluster-deposition method to fabricate CoSi nanoparticles having an average size of 10 nm with an rms standard deviation of σ/d ≈0.10, and investigated their magnetic properties by experiments and first-principle DFT calculations. The X-ray diffraction pattern shows the formation of a B20-type cubic structure in CoSi nanoparticles, similar to bulk alloy. In sharp contrast to bulk CoSi, which is paramagnetic down to 4 K , our experimental results and DFT calculations show a net magnetic moment of about 0.2 μB/Co for the nanoparticles. Nanoscale effects on the magnetism of CoSi, including complex DM interactions, will be presented.
References
1 B. Balasubramanian et al. Appl. Phys. Lett. 108, 152406 (2016).
2B. Das et al. Nano Lett. 16, 1132 (2016).
3N. Nagaosa and Y. Tokura, Nat. Nanotech. 8, 899 (2013).

*This research is supported by the US DOE/BES (Grant Numbers: DE-FG02-04ER46152 and DE-FG02-04ER4612).

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Presenters

  • Balamurugan Balasubramanian

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln
    • University of Nebraska

Authors

  • Balamurugan Balasubramanian

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln
    • University of Nebraska

  • Ralph Skomski

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln
    • University of Nebraska
    • Physics and Astronomy, University of Nebraska

  • Priyanka Manchanda

    • Department of Physics and Astronomy, Vanderbilt University
    • Physics, Vanderbilt
    • Vanderbilt Univ

  • Rabindra Pahari

    • University of Nebraska
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln

  • George Hadjipanayis

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

  • David Sellmyer

    • University of Nebraska
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln
    • Physics and Astronomy, University of Nebraska