Sensitive and quick response micro magnetic sensor utilizing magneto-impedance in Co-rich amorphous wires

Mohri, K.; Panina, I.V.; Uchiyama, Tsuyoshi; Bushida, K.; Noda, Mariko

doi:10.1109/20.364817

Cited by 115 publications

(33 citation statements)

References 18 publications

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“…Thus, from Eqs. (19), (8) and (20), the real R and imaginary X components of the longitudinal impedance as a function of field and frequency for an exchange biased multilayered system can be calculated. Fig.…”

Section: B Resultsmentioning

confidence: 99%

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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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Section: B Resultsmentioning

confidence: 99%

“…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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“…6,8 Since the discovery of the effect, MI has been studied in a wide variety of systems, e. g., sheets, 9 wires, [10][11][12][13][14][15][16][17][18] ribbons, [19][20][21][22][23][24] and thin films. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] In the particular case of films, an increasing interest has been devoted to the effect in single layered, 25,26 multilayered, [27][28][29][30][31][32] and structured multilayered thin films, 30,31,[33][34][35][36][37][38][39] since...…”

Section: Introductionmentioning

confidence: 99%

Magnetization dynamics in nanostructures with weak/strong anisotropy

Andrade

Corrêa

Viegas

et al. 2014

Journal of Applied Physics

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We investigate the high-frequency response of magnetization dynamics through magnetoimpedance (MI) effect in Permalloy-based multilayered thin films produced with two different non-magnetic metallic spacers: Cu and Ag. Due to the nature of the spacer materials, we are able to play with magnetic properties and to study both systems with weak/strong magnetic anisotropy. We verify very rich features in the magnetoimpedance behavior and high magnetoimpedance ratios, with values above 200%. We compare the MI results obtained in multilayered thin films with distinct spacers and number of bilayers, and discuss them in terms of the different mechanisms that govern the MI changes observed at distinct frequency ranges, intensity of the magnetic anisotropy, alignment between dc magnetic field and anisotropy direction. Besides, by considering a theoretical approach that takes into account two single models together and calculate the transverse magnetic permeability and the MI effect, we support our interpretation via numerical calculations modeling the effect of weak/strong magnetic anisotropy on the MI response. Thus, we confirm that these features are very important for the use of multilayered films in sensor applications and, both the frequency and field response can be tailored to fulfill the requirements of a given device.

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“…Among them one could mention the dynamics of the domain wall displacement during the magnetization reversal or circular magnetization processes in bistable composite wires. For rapidly quenched wires some difficulties of the determination of M φ -H φ curves are caused by inhomogeneity of the H φ field created by the flowing current [5][6][7]. In electroplated wires the changes of this field over the thickness of the magnetic layer can be neglected.…”

Section: Introductionmentioning

confidence: 99%

Circular Magnetization Processes in CoFeNi Electroplated Wires

Garcı́a-Miquel

García-Chocano

Kurlyandskaya

2009

SSP

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Abstract. Circular magnetization processes in electroplated wires is an important topic having straight connection with sensor applications of these soft magnetic materials. In present work the longitudinal and circular hysteresis loops were measured and corresponding magnetization processes were studied in Cu 98 Be 2 /Co 16 Fe 20 Ni 64 wires. The longitudinal hysteresis loops, M z -H z , were measured by inductive technique in a frequency range of 10 to 70 Hz. The circular magnetization curves (M φ -H φ ) were measured for frequencies of 50 and 100 kHz in the H φ field up to 1500A/m for different values of the axial external field of 0 to 500 A/m. The longitudinal and circular magnetization curves are comparatively analyzed.

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Sensitive and quick response micro magnetic sensor utilizing magneto-impedance in Co-rich amorphous wires

Cited by 115 publications

References 18 publications

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

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

Magnetization dynamics in nanostructures with weak/strong anisotropy

Circular Magnetization Processes in CoFeNi Electroplated Wires

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