Magnetic properties and microstructures of FePt/Ti bilayer films sputter deposited onto glass amorphous substrates

Sun, H. Y.; Xu, J. L.; Feng, S. Z.; Su, Z. F.; Hu, J.; Sun, Y. P.

doi:doi:10.1063/1.2195781

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Interfacial reactions in a HfO₂/TiN/poly-Si gate stack

Interface reactions are investigated in a Si(100)/SiO2/HfO2/TiN/poly-Si gate stack using electron-energy-loss spectroscopy. The electron-energy-loss near-edge fine structure on the core edges shows evidence of interface reactions having occurred between the TiN metal gate and surrounding layers. A Si(O,N) phase is observed at the TiN/poly-Si interface.

Carrier-mediated ferromagnetism in vanadium-doped (Sb_1−xBi_x)₂Te₃ solid solutions

Ferromagnetism in tetradymite-type diluted magnetic semiconductors (Sb1−xBix)1.98V0.02Te3 (0 ⩽ x ⩽ 1) is revealed to be of hole-mediated nature. The increasing replacement of antimony with bismuth results in a monotonous decrease of the hole concentration and the Curie temperature while the electrical resistivity increases. The value of the Curie temperature shows a linear dependence of Np1/3, where N is the vanadium concentration and p is the concentration of hole. This trend agrees with the m...

FePt/Ti granular films were fabricated onto glass amorphous substrates using a dc facing-target magnetron sputtering system at various Ti underlayer thickness, then annealed at temperature T_a ranging from 200 to 700 °C. In the FePt (30 nm)/Ti (1 nm) film annealed at 600 °C, the coercivity about 12 kOe is obtained. The results of x-ray diffraction indicate that a ternary FePtTi alloy is formed. Thus, the formation of the ternary FePtTi alloy is considered to play an important role in magnetic properties.

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KEYWORDS and PACS

Keywords

iron alloys, platinum alloys, titanium, magnetic multilayers, annealing, coercive force, X-ray diffraction

PACS

75.70.Cn

Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
81.40.Gh

Other heat and thermomechanical treatments
81.40.Rs

Electrical and magnetic properties related to treatment conditions
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.2195781

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

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American Institute of Physics

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