Dependence of the magnetic properties of MnGaN epitaxial layers on external electrical field

• Autorzy: Dimiter Alexandrov
• Języki publikacji: EN

Abstrakty

EN

Investigation of the magnetic properties of MnGaN epitaxial layers as a function of external electrical field was performed on the basis of field effect structure. The structure included substrate of n-type GaN, epitaxial layer of n-type MnxGa1-xN, dielectric layer and metal layer acting as field effect device gate. Each Mn atom in MnxGa1-xN contributes 4 net spins due to the electrons occupying energy levels 4F, 4D, 4P and 4G belonging to 3d orbital, and these levels are in the energy band gap and in the top of the valence band of MnxGa1-xN. The position of the Fermi level is determined to be in the energy band gap of the layer of GaN and to be above the level 4F in the layer of MnxGa1-xN. In this way application of external negative voltage on the gate causes change in the number of electrons contributing net spins and the saturation magnetization Msat of MnxGa1-xN changes as well. It was found that Msat changes in the range 1.15 × 10−3–0.7 × 10−3 A μm−1 if the external voltage changes in the interval 0–−5V. The application of this structure for the design of spintronic devices is discussed in this paper. [...]

Słowa kluczowe

EN

Nitride Semiconductors; Spintronics; Field Effect Device

• Czasopismo: Open Chemistry
• Rocznik: 2009
• Tom: 7
• Numer: 2
• Strony: 175-178

Daty

wydano

2009-06-01

online

2009-04-09

Twórcy

autor

Dimiter Alexandrov

• Department of Electrical Engineering, Lakehead University, Thunder Bay, Ontario, P7B5E1, Canada,

Bibliografia

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Identyfikatory

DOI

10.2478/s11532-008-0079-3