Above room-temperature ferromagnetism in GaN powders by calcinations with CuO

• Gallium nitride powders were calcined with copper oxide in either air or N2 and analyzed by means of powder X-ray diffraction (XRD), high-resolution parallel illumination (HRTEM) and scanning probe transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDXS), and electron energy loss spectroscopy (EELS) in order to address the structural and electronic effects of Cu-incorporation into GaN. Gallium oxide and multiple copper oxide phases corresponding to the calcination environment were detected. Significant changes in the lattice parameters and electronic structure of the N2-processed GaN indicate incorporation of both copper and oxygen into the GaN lattice as well as changes in the chemical bonding due to the calcinations process. SQUID magnetometer measurements at 300 K demonstrated ferromagnetism in selected samples.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Keyword

Electronic effects

Gallium oxide

Scanning probe transmission electron microscopy (STEM)

Calcination

Copper oxides

Electron energy loss spectroscopy

Energy dispersive spectroscopy

Ferromagnetism

High resolution transmission electron microscopy

Lattice constants

Powders

X ray powder diffraction

Gallium nitride

Publication and Content Type

ref (subject category)

kon (subject category)