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Study of Magnetic Inhomogeneity on the Magnetoimpedance Effect of Soft Magnetic Alloys

100%
Mohseni S., Tehranchi M.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 1
406-408
EN
There are various annealing techniques to influence the magnetic anisotropy of amorphous soft magnetic alloys, applicable for magnetic sensing elements. Laser irradiation of amorphous magnetic ribbons is a kind of annealing method to affect their magnetic moment orientations and consequently change their magnetic anisotropy and magnetoimpedance effect. In this paper, we have studied the role of magnetic anisotropy in the magnetoimpedance effect of laser annealed amorphous ribbons. In our theoretical study, we took into account the variations of magnetic anisotropy constants of local magnetic moments after annealing process. We showed that the flatten magnetoimpedance response which was observed in the experiments can be justified by averaging different local anisotropies induced by laser processing.
2
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Investigation of Photonic Band Gaps of One-Dimensional Heterostructure Magnetic Photonic Crystals

100%
Ansari N., Tehranchi M.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 1
378-380
EN
Multiple structures in one-dimensional photonic crystals have great potentials for ultrawide omnireflectors and tunable switches. In this paper, we study the propagation of electromagnetic waves in a one-dimensional heterostructure magnetic photonic crystal for both TE and TM incidence polarizations by means of the transfer matrix method. Results show that by stacking two magnetic photonic crystals as a heterostructure magnetic photonic crystal the omnidirectional total reflection frequency range for any polarization enlarged due to overlapping of photonic band gaps of both magnetic photonic crystals. Omnidirectional band gaps in the heterostructure magnetic photonic crystal is enhanced rather than that in a single magnetic photonic crystal.
3
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Study of Defect Modes in Photonic Band Structure of Magnetic Photonic Crystals by Means of Green's Function

100%
Ansari N., Tehranchi M.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 1
312-314
EN
In this paper, we create an analytical model to investigate the localized defect modes associated with a defect cell inserted into a one-dimensional magnetic photonic crystal. The structure is a magnetic superlattice with alternative layers of two different magnetic permeability containing a defect cell which is a layer of different nature (material or/and size) from the other layers. This leads to appearance of several localized defect modes within the magnetic photonic band gap. Our analytical approach is based on the transfer matrix and Green's function methods to calculate the frequency and number of the defect modes which can be controlled easily by varying parameter values of the constituent layers of the magnetic photonic crystal. This method results in an analytical formula for prediction of frequency of the defect modes for both TE and TM polarizations at arbitrary angle of incidence.
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