Magnetoimpedance of sandwiched films: experimental results and numerical calculations

Kurlyandskaya, G.V.; Muñoz, Josep Lluís García; Barandiarán, J.M.; Garcı́a-Arribas, A.; Svalov, A. V.; Vas’kovskiy, V. O.

doi:10.1016/s0304-8853(01)01147-7

Cited by 42 publications

(31 citation statements)

References 10 publications

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“…It is interesting to mention, that different result was obtained on the basis of pure FEM simulations [8] variation of pure width to thickness ratio from 4 to 50 (in present work this parameters varies from 3.4× 10 3 for S1 to 2.9× 10 4 for S4 sample). In work [8] no influence of the width on MI maximum value was found. Fig.…”

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confidence: 51%

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High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

Volchkov

Svalov

Kurlyandskaya

2009

SSP

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Abstract. In this work magnetoimpedance (MI) behaviour was studied experimentally for Fe 19 Ni 81 (175 nm)/Cu(350 nm)/Fe 19 Ni 81 (175 nm) sensitive elements deposited by rf-sputtering. A constant magnetic field was applied in plane of the sandwiches during deposition perpendicular to the Cu-lead in order to induce a magnetic anisotropy. Sandwiches with different width (w) of FeNi parts were obtained. The complex impedance was measured as a function of the external magnetic field for a frequency range of 1 MHz to 700 MHz for MI elements with different geometries. Some of MI experimental data are comparatively analysed with finite elements numerical calculations data. The obtained results can be useful for optimization of the design of miniaturized MI detectors. IntroductionMagnetoimpedance (MI) is the change of the high frequency impedance of a soft ferromagnet under application external magnetic field [1][2][3][4]. Mathematical description of the magnetoimpedance phenomenon requires analytical solution of the Maxwellґs equations that can be done only for simplest geometries and using approximations [5][6][7]. For example, analytical solution is impossible in case of MI sandwiched structure ferromagnet/conductor/ferromagnet for narrower central conductive part. The finite elements method (FEM) was proposed as useful numerical method for complex geometry of MI sensitive elements [8][9].In this work the longitudinal MI behaviour was studied for

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confidence: 51%

“…For example, analytical solution is impossible in case of MI sandwiched structure ferromagnet/conductor/ferromagnet for narrower central conductive part. The finite elements method (FEM) was proposed as useful numerical method for complex geometry of MI sensitive elements [8][9].…”

Section: Introductionmentioning

confidence: 99%

High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

Volchkov

Svalov

Kurlyandskaya

2009

SSP

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“…Experimentally, studies on MI have been widely performed in sheets 9 , magnetic ribbons 10-15 , wires [16][17][18][19][20][21][22][23] , and in ferromagnetic films with several structures, such as single layered [24][25][26] , multilayered 2,27-33 , and structured multilayered samples [28][29][30][33][34][35][36][37][38][39] .…”

Section: Introductionmentioning

confidence: 99%

Magnetoimpedance effect at the high frequency range for the thin film geometry: Numerical calculation and experiment

Corrêa

Bohn

Silva

et al. 2014

Journal of Applied Physics

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The magnetoimpedance effect is a versatile tool to investigate ferromagnetic materials, revealing aspects on the fundamental physics associated to magnetization dynamics, broadband magnetic properties, important issues for current and emerging technological applications for magnetic sensors, as well as insights on ferromagnetic resonance effect at non-saturated magnetic states. Here, we perform a theoretical and experimental investigation of the magnetoimpedance effect for the thin film geometry in a wide frequency range. We calculate the longitudinal magnetoimpedance for single layered, multilayered or exchange biased systems from an approach that considers a magnetic permeability model for planar geometry and the appropriate magnetic free energy density for each structure. From numerical calculations and experimental results found in literature, we analyze the magnetoimpedance behavior, and discuss the main features and advantages of each structure. To test the robustness of the approach, we directly compare theoretical results with experimental magnetoimpedance measurements obtained in a wide range of frequencies for an exchange biased multilayered film. Thus, we provide experimental evidence to confirm the validity of the theoretical approach employed to describe the magnetoimpedance in ferromagnetic films, revealed by the good agreement between numerical calculations and experimental results.

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“…It seems likely that the FeNi/FeNi structures form a uniform magnetic structure in the supercritical state, and the magnetic domains corresponding to them and representing the fine stripe structure cannot be resolved using the employed experimental method. The last assumption corresponds to the above-indicated critical thickness L c ≈ 100 nm [12,14]. It seems likely that the spontaneous magnetization vectors of the FeNi/Cu/FeNi magnetic layers lie in the film plane (both for film elements TI and TII).…”

Section: Results and Their Discussionmentioning

confidence: 93%

Magnetic properties and huge magnetic impedance of permalloy/ copper/permalloy film elements

Volchkov¹,

Lepalovskii²,

Svalov³

et al. 2009

Russ Phys J

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537.622; 621.785 V. O. Vas'kovskii, and G. V. Kurlyandskaya Magnetic properties, special features of magnetic anisotropy, magnetic domain structure, and huge magnetic impedance of permalloy/copper/permalloy film elements fabricated by the method of ion-plasma sputtering are investigated. Elements with different plane geometry of layers are analyzed. In the first case, all layers of the element have identical sizes of 10 × 0.5 mm, and in the second case, the width of the copper layer is narrowed down to 0.2 mm. The magnetic properties and the magnetic impedance of the examined film elements allow them to be used as detectors of low magnetic fields. The elements of the first type are more adapted to low excitation current frequencies (up to 150 MHz), and those of the second type are more adapted to high frequencies (above 150 MHz).

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Magnetoimpedance of sandwiched films: experimental results and numerical calculations

Cited by 42 publications

References 10 publications

High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

Magnetoimpedance effect at the high frequency range for the thin film geometry: Numerical calculation and experiment

Magnetic properties and huge magnetic impedance of permalloy/ copper/permalloy film elements

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