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Above Room-Temperature Ferromagnetism in GaN Powders by Calcinations with CuO

Published online by Cambridge University Press:  01 February 2011

Lori Noice ,
Bjoern Seipel ,
Rolf Erni ,
Amita Gupta ,
Chunfei Li ,
peter Moeck ,
Venkat Rao  and
Nigel Browning
Lori Noice
Affiliation:
noice@pdx.edu, Portland State University, Department of Physics, Portland State University, P.O.Box 751, Portland, OR, 97207-0751, United States, 503-725-4248
Bjoern Seipel
Affiliation:
bseipel@pdx.edu, Portland State University, Department of Physics, Portland State University, P.O.Box 751, Portland, OR, 97207-0751, United States
Rolf Erni
Affiliation:
Rolf.Erni@nl.feico.com, University of California at Davis, Department of Chemical Engineering and Materials Science, University of California at Davis, One Shields Avenue, Davis, CA, 95616, United States
Amita Gupta
Affiliation:
amitag@kth.se, The Royal Institute of Technology, Department of Materials Science, Tmfy-MSE, The Royal Institute of Technology, Brinellvägen 23, Rm 224, SE 100 44, Stockholm, N/A, N/A, Sweden
Chunfei Li
Affiliation:
chunfei@pdx.edu, Portland State University, Department of Physics, Portland State University, P.O.Box 751, Portland, OR, 97207-0751, United States
peter Moeck
Affiliation:
pmoeck@pdx.edu, Portland State University, Department of Physics, Portland State University, P.O.Box 751, Portland, OR, 97207-0751, United States
Venkat Rao
Affiliation:
rao@kth.se, The Royal Institute of Technology, Department of Materials Science, Tmfy-MSE, The Royal Institute of Technology, Brinellvägen 23, Rm 224, SE 100 44, Stockholm, N/A, N/A, Sweden
Nigel Browning
Affiliation:
nbrowning@ucdavis.edu, University of California at Davis, Department of Chemical Engineering and Materials Science, University of California at Davis, One Shields Avenue, Davis, CA, 95616, United States
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Abstract

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.

Keywords

III-Vspintroniccrystallographic structure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 941: Symposium Q – Magnetic Thin Films, Heterostructures, and Device Materials , 2006 , 0941-Q08-14
Copyright
Copyright © Materials Research Society 2006

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