Quantifying magnetic anisotropy dispersion: Theoretical and experimental study of the magnetic properties of anisotropic FeCuNbSiB ferromagnetic films

Abstract

The Stoner-Wohlfarth model is a traditional and efficient tool to calculate magnetization curves and it can provides further insights on the fundamental physics associated to the magnetic properties and magnetization dynamics. Here, we perform a theoretical and experimental investigation of the quasi-static magnetic properties of anisotropic systems. We consider a theoretical approach which corresponds to a modified version of the Stoner-Wohlfarth model to describe anisotropic systems and a distribution function to express the magnetic anistropy dispersion. We propose a procedure to calculate the magnetic properties for the anisotropic case of the SW model from experimental results of the quadrature of magnetization curves, thus quantifying the magnetic anisotropy dispersion. To test the robustness of the approach, we apply the theoretical model to describe the quasi-static magnetic properties of amorphous FeCuNbSiB ferromagnetic films. We perform calculations and directly compare theoretical results with longitudinal and transverse magnetization curves measured for the films. Thus, our results provide experimental evidence to confirm the validity of the theoretical approach to describe the magnetic properties of anisotropic amorphous ferromagnetic films, revealed by the excellent agreement between numerical calculation and experimental results.

Magneto-optical study of anomalous magnetization reversal in the presence of anisotropy dispersion in CoPd thin films

“…In this regard, magnetization reversal data give a lot of information about magnetic anisotropy [1,2], exchange bias coupling [3,4], exchange spring effect [5][6][7], etc. Magnetization reversal is particularly complex in magnetic systems with large anisotropy dispersion, as highlighted by numerous studies [8][9][10][11][12][13].…”

Mirroring the dynamic magnetic behavior of magnetostrictive Co/(Ag,Cu,Ta) multilayers grown onto rigid and flexible substrates

“…The weak anisotropy induction and increase of the hysteresis losses verified for the Co/Ta multilayers are mainly associated to the evolution of Co texture induced when the Ta is used as spacer. In this case, the distinct lattice parameters and surface free energy of the materials affect directly the uniformity of the layers and may generate symmetry breaking in the interfaces, leading to spin-orbit interactions, and resulting in local anisotropies induced by stress, responsible by the increase of the magnetic anisotropy dispersion [25].…”

Study of the effect of the deposition rate and seed layers on structure and magnetic properties of magnetron sputtered FeNi films

“…It is known, that the magnetostatic energy of the domain wall is proportional to the angular dispersion of anisotropy [27,28], thus increase of the anisotropy dispersion should lead to an increase of coercive force. However, the sample prepared at the deposition rate of 18 nm/min has maximum anisotropy dispersion, but minimum coercivity (Table 1).…”