Magnetic and Structural Properties of Mn$_{\mathrm{5}}$Ge$_{\mathrm{3\thinspace }}$Nanoparticles

ORAL

Abstract

Magnetic nanoparticles have unique and interesting properties which are scientifically important and attractive for numerous advanced technologies. In this work, we have used the cluster-beam deposition technique to synthesize Mn$_{\mathrm{5}}$Ge$_{\mathrm{3}}$ nanoparticles with different size. The composition, crystal structure and magnetic properties of the nanoparticles have been characterized by energy dispersive x-ray spectroscopy (EDS), X-ray diffraction, high-resolution transmission electron microscopy (HR-TEM) and magnetometry, respectively. Particles made with 1.7 Torr Argon pressure, and power of 80 W had an average size of 14 nm. Selected area electron diffraction showed that the particles had a hexagonal Mn$_{\mathrm{5}}$Si$_{\mathrm{3}}$-type structure with space group P63/mcm which is the same as in bulk. Magnetic measurements showed that the nanoparticles are ferromagnetic with a Curie temperature near room temperature. The effects of particle size and temperature on the magnetic properties are currently being studied and the results will be reported and discussed.

*DOE-BES-DE-FG02-04ER4612 and DE-FG02-04ER46152

–

Authors

  • Onur Tosun

    • Univ of Delaware

  • Mohammad Salehi-Fashami

    • University of Delaware
    • Univ of Delaware

  • George C Hadjipanayis

    • University of Delaware
    • Physics and Astronomy, University of Delaware
    • Univ of Delaware
    • Department of Physics and Astronomy, University of Delaware, Newark, DE, USA

  • D. J. Sellmyer

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska
    • University of Nebraska–Lincoln
    • Physics and Astronomy and NCMN, University of Nebraska
    • Univ of Nebraska-Lincoln
    • University of Nebraska Lincoln
    • University of Nebraska, Lincoln
    • Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588

  • Bala Balamurugan

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