We devised a method to measure the virtual magnetic field induced by Rashba effect in ferromagnetic metal layer. Transverse Rashba magnetic field makes the magnetization direction tilted out of the easy axis, which could be detected by the change in anomalous hall resistances. Through a specified measurement of the second harmonics of the hall resistance, the Rashba field could be obtained with high sensitivity even at low current regime. The results are compared with the prior reports based on the measurement of the transverse field required for the nucleation of reversed domain.
Mesoporous silica SBA-15 molecular sieves have been incorporated with various amounts
of vanadium via incipient-wetness impregnation with vanadium oxide triisopropoxide in
hexane followed by calcination. The products (VSBA-15) have been characterized by nitrogen
adsorption and diffuse reflectance UV−visible and electron spin resonance spectroscopies.
The results show that the vanadium exists as isolated tetrahedral V5+ ions in dehydrated
VSBA-15 with Si/V ≥ 40 while vanadium chains develop as vanadium loading increases.
Upon hydration a large fraction of the vanadium is transformed to square pyramidal and
distorted octahedral V5+ ions by additional coordination to water molecules, suggesting an
interior wall surface location for these V5+ ions. Upon CO reduction or incorporation of
N-alkylphenothiazines (PC
n
), part of the V5+ is reduced to vanadyl VO2+ ions. While
incorporation of PC
n
into VSBA-15 in the dark generates some PC
n
+ cation radicals,
ultraviolet photoionization at room temperature further increases the yield for Si/V = 80
and 40. The PC
n
+ radicals are more stable in VSBA-15 than in siliceous SBA-15, and the
photoyield increases with vanadium loading. The photoyield and stability of PC
n
+ also
increase with increasing alkyl chain length of the N-alkylphenothiazines.
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