Advanced Nanomaterials: Synthesis, Properties, and by Sabu Thomas, Nandakumar Kalarikkal, A. Manuel Stephan, B.
By Sabu Thomas, Nandakumar Kalarikkal, A. Manuel Stephan, B. Raneesh
A selection of hugely chosen, peer-reviewed chapters, this booklet showcases the examine of a global roster of scientists. It covers nanomaterials with emphasis on synthesis, characterization, and functions. It additionally offers rising advancements in nanotechnology in components as different as drugs, strength, electronics, and agriculture. as well as engineering elements, the ebook discusses the physics, chemistry and biotechnology in the back of the fabrication and equipment designing.
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Additional info for Advanced Nanomaterials: Synthesis, Properties, and Applications
Ferromagnetic resonance of particulate magnetic recording tapes. J. Appl. Phys. , and Sakhnini, L. The dependence of the physical and magnetic properties of magnetic fluids on particle size. J. Magn. Magn. Mater, 149, 72 (1995). Puszkarski, H. Prog. Surf. Sci. 9, 191 (1979). Raikher, Yu. L. ,and Stepenov, V. I. Ferromagnetic resonance in a suspension of singledomain particles. Phys. Rev. B, 50, 6250 (1994). , and Berkowitz, A. Spin-polarized tunneling in discontinuous CoFe/ HfO2 multilayers. J.
3 SURFACE ANISOTROPY The perturbation of the crystal symmetry at the surface of nanoparticles should lead to a magnetocrystalline anisotropy, which differs in magnitude and symmetry from that of the bulk. The overall influence of surface anisotropy in a nanoparticle will depend on the strength of the anisotropy constant itself and on the size of the particles. Such effects will be more pronounced in smaller particles. With regards to the energy related to surface anisotropy we can distinguish between cases where the surface spins have a preferred orientation with respect to the crystalline axes, as described by (Kachkachi and Bonet, 2006): E Surf = −∑ K s (mi ⋅ uˆ i ) 2 (19) i ˆ i a unit vector where mi is the unit vector in the direction of the magnetization and u in the direction of the easy axis.
We have also applied the theory to the discontinuous multilayer system [Al2O3(40 Å)/ Co80Fe20 (t)]10/Al2O3(30 Å), where the effective magnetic layer thickness, t, was varied between 7 and 13 Å. We observe that the DDI theory adequately explains the angular dependence of the resonance field and is directly related to the average dipole interaction between the magnetic nanoparticles. From angular dependent FMR measurements there appears to be a change in magnetic regime from thinner to thicker samples.