Kim, Sang Woo Lee, Jung Hwan 2024-01-20T21:33:40Z 2024-01-20T21:33:40Z 2021-09-01 2009-04-01 0021-8979 https://pubs.kist.re.kr/handle/201004/132583 Gigahertz frequency characteristics were appraised by theoretical calculation based on a modified Landau-Lifshitz-Gilbert equation in order to examine the effect of electromagnetic induction and artificially controlled shape anisotropy in micropatterned magnetic films. Electromagnetic loss behaviors and magnetic fields of semiconducting soft magnetic films on a coplanar transmission line were numerically analyzed using a finite-element based electromagnetic solver. The combined relative permeability due to the electromagnetic induction and demagnetizing effect showed to be highly dependent on electrical resistivity and film thickness. Higher resistivity films at the same thickness of 2 mu m showed higher loss in power and lower reflection because of the reduced electromagnetic induction. Thinner magnetic films at the same resistivity of 100 mu Omega cm exhibited lower reflection due to the reduced electromagnetic induction and maxima of the reflection shifted to higher frequencies because of demagnetization associated with the structure of magnetic flux path. A severe increment of the radiated electromagnetic noise with decreasing resistivity was caused by the reflection of the radiated noise from the surface of the low resistivity films on the coplanar line in gigahertz frequency bands. A slight increase in the radiation noise with increasing thickness at the same resistivity confirmed to be caused by the increased reflection. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3073957] English AMER INST PHYSICS NOISE-SUPPRESSOR Estimation of high-frequency loss properties through analytical calculation for semiconducting soft magnetic films in a near-field electromagnetic wave Article 10.1063/1.3073957 1 JOURNAL OF APPLIED PHYSICS, v.105, no.7 JOURNAL OF APPLIED PHYSICS 105 7 scie scopus 000266633500176 2-s2.0-65249116293 Physics, Applied Physics Article; Proceedings Paper NOISE-SUPPRESSOR soft magnetic films high-frequency loss semiconducting electromagnetic wave near-field