Magnetic skyrmions are chiral quasiparticles that show promise for storage of information. At present, the achievable skyrmion density (η Sk ) is generally low (10−20 μm −2 ) because of the lack of effective manipulation. Here, both the magnetic anisotropy (K eff ) and interfacial Dzyaloshinskii−Moriya interaction (DMI) of [Pt/Co/Ta] n multilayer films are elaborately modulated by changing the Co thickness (t Co ) to study the η Sk dependence of intrinsic properties of the films systematically. The experimental and simulated results confirm that both the DMI and K eff have significant modifications on η Sk , and their respective contributions vary with t Co . Only when the magnetic anisotropy transits from out-of-plane to in-plane at an appropriate t Co range (1.8−2.1 nm) does the K eff decrease and the DMI increase with the t Co . Both the factors are favorable to the skyrmion formation and increase the density synergistically, toggling a maximal η Sk value of 45 μm −2 . These findings provide a criterion for designing the high η Sk magnetic film, which may advance the development of high-density skyrmion-based magnetic memorizers.
Yellow-emitting NaCaPO(4):Mn(2+) phosphors were prepared by the Pechini sol-gel process. Under low voltage electron beam excitation, the NaCaPO(4):Mn(2+) phosphor screen shows bright yellow emission (centering at 560 nm due to the (4)T(1)→(6)A(1) transition of Mn(2+)) with the CIE color coordinate (0.428, 0.552), which has a higher color purity than commercial yellow-emitting FED phosphor (Zn, CdS):Ag(+). The color range and chromaticity saturation may be greatly enhanced when the yellow-emitting NaCaPO(4):Mn(2+) is added as an additional phosphor of the typical tricolor FEDs phosphors, which make them have potential to improve the display quality of full-color FEDs.
Li(2)CaSiO(4):Eu(2+) cyan phosphor screen for enlarging the color gamut of field emission display has been prepared and characterized. The luminance of Li(2)CaSiO(4):Eu(2+) phosphor film can reach as high as about 12000 cd/m(2) under the conditions of V(a) = 7 kV and J(a) = 2.8 mA/cm(2). The cathodoluminescent spectrum, luminance, saturation current density and degradation property are compared with another cyan phosphor Mg(2)SnO(4):Ti(4+),Mn(2+). It is found that Li(2)CaSiO(4):Eu(2+) phosphor exhibits narrower emission band, higher luminance, higher saturation current density, higher resistance to electron bombardment, higher thermal stability and conductivity as well as purer color. Thus, Li(2)CaSiO(4):Eu(2+) has great potential in application in field emission display as well as light emitting diode.
The cathodoluminescent properties of nanocrystalline Lu3Ga5O12:Tb3+ phosphor films were investigated. Phosphor films were prepared on indium tin oxide coated glass by a screen printing method. The Lu3Ga5O12:Tb3+ phosphor is mixed with In2O3 nanoparticles to improve the luminescence and degradation properties of phosphor films under electron excitation. Cathodoluminescent spectra and luminance degradation behavior of the Lu3Ga5O12:Tb3+ phosphor films under electron bombardment were studied. Enhancement of the luminescence was observed after being mixed with In2O3 nanoparticles. Also, the In2O3 mixed Lu3Ga5O12:Tb3+ phosphor shows improvement of the resistance to the electron bombardment. The results show that the Lu3Ga5O12:Tb3+ phosphor is stable under electron bombardment and has potential for application in field emission display devices.
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