Title :
Magnetic induced optical transmittance study of monodisperse nano-size FePt ferrofluid
Author :
Wu, K. ; Yao, Y. ; Lee, C. ; Wei, P. ; Huang, K. ; Chang, C.
Author_Institution :
Fu Jen Univ., Taipei
Abstract :
In this study, the variation of the transmission of light through the FePt magnetic fluid has been investigated as a function of external magnetic field and incident optical wavelength. The optical transmission of monodisperse nano-size FePt ferrofluid with particle size between 2 and 10 nm have been studied with incident optical wavelengths between 450 and 750 nm and applied magnetic fields up to 225 Oe.The ordered fct FePt phase has high magnetic anisotropy and thus large coercivity up to 1.2 T. The optical transmission spectra were measured by means of a spectrophotometer. The optical transmission increases with decreasing the concentration of FePt. However, under an applied magnetic field, the optical transmission decreases for samples.
Keywords :
iron alloys; light transmission; magnetic fluids; magneto-optical effects; nanostructured materials; particle size; platinum alloys; FePt; coercivity; magnetic anisotropy; magnetic field; magnetic fluid; magnetic induced optical transmittance; monodisperse nanosize ferrofluid; optical transmission spectra; particle size; spectrophotometer; wavelength 450 nm to 750 nm; Coercive force; Geometrical optics; Magnetic anisotropy; Magnetic field measurement; Magnetic fields; Magnetic liquids; Particle measurements; Perpendicular magnetic anisotropy; Phase measurement; Size measurement;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.376264
