Magnetic modes in Ni nanowires

Preparation and FMR analysis of Co nanowires in alumina templates

“…FMR experiments have been performed for some NW arrays with wire diameters ranging from 12 to 500 nm [1,[21][22][23][24]. Spin-wave modes (SWMs) in magnetic NWs have been investigated by different researchers [25][26][27][28][29][30]. The FMR and magnetization show that magnetostatic/dipolar interactions are important in determining the final anisotropy field for different diameter NWs [22][23][24][25]28,[31][32][33][34][35][36][37][38].…”

Nanomagnetic scaling

“…Note that the magnetostatic selfinteraction H d has been incorporating the into K 1 (shape anisotropy) and H (local field). This is exact for nucleation modes in perfect ellipsoids [7,20,29], thin nanowires [30][31][32], and some two-phase nanostructures [33], and a good approximation when magnetostatic effects can be treated on a mean-field level [20]. The r term in Eqs.…”

Fast and Slow Magnetization Processes in Magnetic Recording Media

“…1(c) approximates the composite nanoparticle by two particles interacting via an effective exchange J ~ 1/L 2 , where L is the particle size. The model has been used to discuss the coercivity of small permanent-magnet particles [7], but it can also be used to estimate the spin-wave dynamics of the system, in analogy to the wellknown treatment of ferromagnetic resonance by Kittel [8,9]. The solution of the problem amounts to the diagonalization of a 2 × 2 matrix whose nondiagonal matrix elements are proportional to J and where the demagnetization field of [8] is replaced by a more general anisotropy field.…”