Microwave Permeability of FeCoAlON Ferromagnetic Thin Films with Stripe Domain Structure

Abstract

We report the observation of multiple permeability peaks for FeCoAlON thin ferromagnetic films with stripe domain structure, in the 100 MHz to 5 GHz range and the space between any two adjacent peaks is equal approximately. This behavior should be correlated with the sinusoidal distribution of the magnetic moments and their magnetic collective excitation in the stripe domain. The multiple peak resonance can be described in terms of the phonon theory.

Magnetization enhanced the multiple magnetic domain-dominated resonance modes in stripe domain films

“…Many studies have already been performed on the static and high-frequency magnetic properties of SD by changing the thickness [16,17,19,22,27] or perpendicular magnetic anisotropy [18,[30][31][32][33]. However, the observed resonant peaks excited by the microwave for most experimental results [9,12,15,16,18,19,22,28,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] are weak, and the number of resonant peaks is less than four due to weak contributions from the less dominant regions. Regarding the studies on the exchange stiffness, they are usually achieved through the interlayer exchange coupling [49][50][51] and the studies mainly focus on the domain structure or static magnetic parameters of the SD films.…”

Approximate Solution of the Magnetostatic Property of FeCoZr Thin Films with Stripe Domain

“…However, the above simplified model is useful to explain the dynamic property of thin films with stripe domains. 6) As we all know, a ferromagnetic body is divided into many domains in order to reduce the magnetostatic energy. Thus, let us check the magnetostatic item " m in Eq.…”