Non-magnetic medium

The starting point is Maxwell s equations. We consider a non-magnetic medium (/i = fj,o) with a linear permittivity e(u>, x, y) that doesn t depend on the propagation coordinate z. 

Pershan et al. observed a new effect, referred to as the inverse Faraday effect, consisting in the magnetization of a non-absorbing medium by a circularly polarized laser beam ... 

The nonlinear polarization Pi(fl, r ) of Eq. (10) is a pnrely local surface polarization because it only depends on the value of the fields at location r. Because it depends on the fundamental field inside the particle, it is subjected to resonances when the quantity s(ft)) + 2e , vanishes, where e(w) is the complex dielectric function of the metal and that of the surrounding medium. On the opposite, the nonlinear polarization 2( 2, E) of the form of Eq. (11) is a non local nonlinear polarization since it depends on spatially varying fields within the particle. Similarly to the first order contribution, it is subjected to resonances when the quantity 2e(w) + 3e vanishes. These resonances are the usual surface plasmon resonances of the particle. Within the condition of non magnetic media, the magnetic dipole field does not introduce any resonances. We neglect higher order terms. 

Furthermore, in a non-magnetic (where the permeability 4= 1) medium, n is related to the complex frequency-dependent dielectric constant (cop), and the dielectric susceptibility Xg, by... 

Thus in a uniform non-conducting medium the magnetic fleld does not depend on /x while the electric fleld related with the electromotive force as... 

We study a general linear, non-magnetic, dielectric medium with arbitrary periodic dielectric function, (r) = g(r-i-R), where R =. /,a, is a vector of the direct... 

Here we will examine the nature of electromagnetic propagation in a semi-infinite medium, starting with Maxwell s Equations for a non-magnetic, uniform charge density material (for more details refer to Jackson 1975) ... 

In electromagnetic theory the Faraday effect can be explained as follows. When the medium magnetization has non-zero projection on the wave vector ko of the incident radiation, two independent fundamental Maxwell equations solutions are circular polarized waves with different refractive indexes n+M n, respectively. At the output of the magnetic medium these waves gain phase shift and when added give Unearly polarized wave with rotated polarization plane. That is why Faraday effect is also called magnetic circular birefringence [26, 27]. 

Now we consider the propagation of light in uniform non-magnetic anisotropic media [3, 5]. The speed of light in the medium, and thus the phase vaiiafion in space, depends on the direction of the electric field with respect to the oplieal axis of the medium. The optical properties of... 

Copolymer resin (p-CAF) was synthesized by the condensation of p-cresol and adipamide with formaldehyde in the presence of hydrochloric acid as catalyst and using varied molar ratios of reacting monomers. A composition of the copolymers has been determined on the basis of their elemental analysis. The number average molecular weight of resins was determined by conductometric titration in non-aqueous medium. The copolymer resins were characterized by viscometric measurements in dimethylsulphoxide (DMSO), UV-visible absorption spectra in non-aqueous medium, infrared (IR) spectra, and nuclear magnetic resonance (NMR) spectra. The morphology of the copolymers was studied by scanning electron microscopy (SEM). 

Structure of a longitudinal thin film recording medium consists of a substrate, typically a borosilicate glass or an Al-Mg alloy about 1-2 mm in thickness, coated with an amorphous non-magnetic layer of NiP that is 5 10 m in thickness, a Cr underlayer approximately 100-150 nm in thickness, a CoGrTaPt magnetic layer approximately 20-30 nm in thickness and a carbon overcoat approximately 10-20 nm thick. Such a structure is depicted schematically in Figure 1.22 which represents a typical cross-sectional view of the layered structure of a hard disk medium. 

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