NDLI: Magnetotransport properties of a room-temperature ferromagnet (Ga, Mn)N

Content Provider	IEEE Xplore Digital Library
Author	Holmberg, H. Lebedeva, N. Novikov, S. Kuivalainen, P. Malfait, M. Moshchalkov, V.V. Kostamo, P.
Copyright Year	1965
Abstract	Heavily Mn-doped GaN thin films were fabricated by using solid-state diffusion. The magnetic properties of the samples were determined by Hall effect measurements and by using a superconducting quantum interference device. The results show ferromagnetic behavior even above room temperature, the Curie temperature being 330 K. The samples were of n-type and the estimated electron concentration was /spl ap/1/spl times/10/sup 20/ cm/sup -3/. Due to the spin-disorder scattering, a negative magnetoresistance was observed and it was largest at Curie temperature. The measured sheet resistance versus temperature could also be explained by the spin disorder scattering model for ferromagnetic metals. From the measurement results, the value of the exchange interaction parameter between the electron spins and the magnetic moments of the Mn atoms was estimated to be about 1 eV. The material properties were studied also by using secondary ion mass spectroscopy and X-ray diffraction, which showed some segregation of Ga/sub x/Mn/sub y/.
Sponsorship	IEEE Magnetics Society
Starting Page	2736
Ending Page	2738
Page Count	3
File Size	183904
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic properties Temperature Electrons Particle scattering X-ray scattering Electrical resistance measurement Atomic measurements Superconducting magnets Gallium nitride Superconducting thin films manganese compounds Hall effect magnetic semiconductors
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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