Use of a microconductor with natural ferromagnetic resonance for radio-absorbing materials

On micromagnetic theory of thin cast amorphous microwires

“…Furthermore, for Co-based and Fe-based cast amorphous microwires the resonance frequencies are approximately 2 and 7 GHz, respectively. As a final point, we suggest that these types of micorwires could adequately be used as radio absorbing materials [12], HF sensors and memory elements. The one with the minus sign provides the exact solution for the boundaries yð0Þ ¼ p and yð1Þ ¼ p=2, while the plus sign provides for the boundaries yð0Þ ¼ 0 and yð1Þ ¼ p=2.…”

Use of the Cast Amorphous Microwire Witch Natural Ferromagnetic Resonance for High Frequencies Radioabsorbing Materials and Screens

“…The resonance permeability /u1(Co) is proportional to 10÷102, and a decreases three times when frequency increases to resonance (from 1 GHz to 10 GHz). Now we know experimental data on absorption of electromagnetic waves only in case [1] r>8 ,…”

“…The resonance permeability /u1(Co) is proportional to 10÷102, and a decreases three times when frequency increases to resonance (from 1 GHz to 10 GHz). Now we know experimental data on absorption of electromagnetic waves only in case [1] r>8 ,where r~3 10 gm is the radius of amorphous metal core of microwire . The existence of natural ferromagnetic resonance in the cast amorphous microwire in the frequency of range of order -I 12 GHz has opened up the possibility of developing of radio absorbing screens.…”

“…In the high frequency (HF) band [ 9 ] for fo-I10 GHz, c) = 2irfo (1) where (,u1uo )e is the effective magnetic permeability, c-is the microwire electrical conductivity, d5 is a skin layer depth in non magnetic microwire (S5 -10:5 gm for 1-10 GHz). The resonance permeability /u1(Co) is proportional to 10÷102, and a decreases three times when frequency increases to resonance (from 1 GHz to 10 GHz).…”

“…As there are not the publications on protective screens manufactured on the basis of cast amorphous microwires, we will be limited of the analysis of an opportunity of application of these materials. The radio absorption properties of these cast amorphous microwire (produced by Ulitovsky-Taylor method) appear around the frequency of natural ferromagnetic resonance, in the range of 1-12 GHz ( see in [1][2][3][4][5][6][7][8] ). In that range, dispersion is observed in the real and imaginary components of relative magnetic permeability:…”